Articles | Volume 12, issue 6
https://doi.org/10.5194/esurf-12-1267-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-12-1267-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
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08 Nov 2024
Research article | Highlight paper |
| 08 Nov 2024
| 08 Nov 2024
Testing floc settling velocity models in rivers and freshwater wetlands
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Gen K. Li
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Department of Earth Science, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
Joshua P. Harringmeyer
Department of Earth and Environment, Boston University, Boston, MA 02215, USA
Gerard Salter
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
Cédric G. Fichot
Department of Earth and Environment, Boston University, Boston, MA 02215, USA
Luca Cortese
Department of Earth and Environment, Boston University, Boston, MA 02215, USA
Michael P. Lamb
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
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Luca Cortese, Carmine Donatelli, Xiaohe Zhang, Justin A. Nghiem, Marc Simard, Cathleen E. Jones, Michael Denbina, Cédric G. Fichot, Joshua P. Harringmeyer, and Sergio Fagherazzi
Biogeosciences, 21, 241–260, https://doi.org/10.5194/bg-21-241-2024, https://doi.org/10.5194/bg-21-241-2024, 2024
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This study shows that numerical models in coastal areas can greatly benefit from the spatial information provided by remote sensing. Three Delft3D numerical models in coastal Louisiana are calibrated using airborne SAR and hyperspectral remote sensing products from the recent NASA Delta-X mission. The comparison with the remote sensing allows areas where the models perform better to be spatially verified and yields more representative parameters for the entire area.
Brayden Noh, Omar Wani, Kieran B. J. Dunne, and Michael P. Lamb
Earth Surf. Dynam., 12, 691–708, https://doi.org/10.5194/esurf-12-691-2024, https://doi.org/10.5194/esurf-12-691-2024, 2024
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In this paper, we propose a framework for generating risk maps that provide the probabilities of erosion due to river migration. This framework uses concepts from probability theory to learn the river migration model's parameter values from satellite data while taking into account parameter uncertainty. Our analysis shows that such geomorphic risk estimation is more reliable than models that do not explicitly consider various sources of variability and uncertainty.
Christian Lønborg, Cátia Carreira, Gwenaël Abril, Susana Agustí, Valentina Amaral, Agneta Andersson, Javier Arístegui, Punyasloke Bhadury, Mariana B. Bif, Alberto V. Borges, Steven Bouillon, Maria Ll. Calleja, Luiz C. Cotovicz Jr., Stefano Cozzi, Maryló Doval, Carlos M. Duarte, Bradley Eyre, Cédric G. Fichot, E. Elena García-Martín, Alexandra Garzon-Garcia, Michele Giani, Rafael Gonçalves-Araujo, Renee Gruber, Dennis A. Hansell, Fuminori Hashihama, Ding He, Johnna M. Holding, William R. Hunter, J. Severino P. Ibánhez, Valeria Ibello, Shan Jiang, Guebuem Kim, Katja Klun, Piotr Kowalczuk, Atsushi Kubo, Choon-Weng Lee, Cláudia B. Lopes, Federica Maggioni, Paolo Magni, Celia Marrase, Patrick Martin, S. Leigh McCallister, Roisin McCallum, Patricia M. Medeiros, Xosé Anxelu G. Morán, Frank E. Muller-Karger, Allison Myers-Pigg, Marit Norli, Joanne M. Oakes, Helena Osterholz, Hyekyung Park, Maria Lund Paulsen, Judith A. Rosentreter, Jeff D. Ross, Digna Rueda-Roa, Chiara Santinelli, Yuan Shen, Eva Teira, Tinkara Tinta, Guenther Uher, Masahide Wakita, Nicholas Ward, Kenta Watanabe, Yu Xin, Youhei Yamashita, Liyang Yang, Jacob Yeo, Huamao Yuan, Qiang Zheng, and Xosé Antón Álvarez-Salgado
Earth Syst. Sci. Data, 16, 1107–1119, https://doi.org/10.5194/essd-16-1107-2024, https://doi.org/10.5194/essd-16-1107-2024, 2024
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In this paper, we present the first edition of a global database compiling previously published and unpublished measurements of dissolved organic matter (DOM) collected in coastal waters (CoastDOM v1). Overall, the CoastDOM v1 dataset will be useful to identify global spatial and temporal patterns and to facilitate reuse in studies aimed at better characterizing local biogeochemical processes and identifying a baseline for modelling future changes in coastal waters.
Gary Parker, Chenge An, Michael P. Lamb, Marcelo H. Garcia, Elizabeth H. Dingle, and Jeremy G. Venditti
Earth Surf. Dynam., 12, 367–380, https://doi.org/10.5194/esurf-12-367-2024, https://doi.org/10.5194/esurf-12-367-2024, 2024
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River morphology has traditionally been divided by the size 2 mm. We use dimensionless arguments to show that particles in the 1–5 mm range (i) are the finest range not easily suspended by alluvial flood flows, (ii) are transported preferentially over coarser gravel, and (iii), within limits, are also transported preferentially over sand. We show how fluid viscosity mediates the special status of sediment in this range.
Luca Cortese, Carmine Donatelli, Xiaohe Zhang, Justin A. Nghiem, Marc Simard, Cathleen E. Jones, Michael Denbina, Cédric G. Fichot, Joshua P. Harringmeyer, and Sergio Fagherazzi
Biogeosciences, 21, 241–260, https://doi.org/10.5194/bg-21-241-2024, https://doi.org/10.5194/bg-21-241-2024, 2024
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This study shows that numerical models in coastal areas can greatly benefit from the spatial information provided by remote sensing. Three Delft3D numerical models in coastal Louisiana are calibrated using airborne SAR and hyperspectral remote sensing products from the recent NASA Delta-X mission. The comparison with the remote sensing allows areas where the models perform better to be spatially verified and yields more representative parameters for the entire area.
Madison M. Douglas, Gen K. Li, Woodward W. Fischer, Joel C. Rowland, Preston C. Kemeny, A. Joshua West, Jon Schwenk, Anastasia P. Piliouras, Austin J. Chadwick, and Michael P. Lamb
Earth Surf. Dynam., 10, 421–435, https://doi.org/10.5194/esurf-10-421-2022, https://doi.org/10.5194/esurf-10-421-2022, 2022
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Arctic rivers erode into permafrost and mobilize organic carbon, which can react to form greenhouse gasses or be re-buried in floodplain deposits. We collected samples on a permafrost floodplain in Alaska to determine if more carbon is eroded or deposited by river meandering. The floodplain contained a mixture of young carbon fixed by the biosphere and old, re-deposited carbon. Thus, sediment storage may allow Arctic river floodplains to retain aged organic carbon even when permafrost thaws.
Marco Toffolon, Luca Cortese, and Damien Bouffard
Geosci. Model Dev., 14, 7527–7543, https://doi.org/10.5194/gmd-14-7527-2021, https://doi.org/10.5194/gmd-14-7527-2021, 2021
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The time when lakes freeze varies considerably from year to year. A common way to predict it is to use negative degree days, i.e., the sum of air temperatures below 0 °C, a proxy for the heat lost to the atmosphere. Here, we show that this is insufficient as the mixing of the surface layer induced by wind tends to delay the formation of ice. To do so, we developed a minimal model based on a simplified energy balance, which can be used both for large-scale analyses and short-term predictions.
Thomas Croissant, Robert G. Hilton, Gen K. Li, Jamie Howarth, Jin Wang, Erin L. Harvey, Philippe Steer, and Alexander L. Densmore
Earth Surf. Dynam., 9, 823–844, https://doi.org/10.5194/esurf-9-823-2021, https://doi.org/10.5194/esurf-9-823-2021, 2021
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In mountain ranges, earthquake-derived landslides mobilize large amounts of organic carbon (OC) by eroding soil from hillslopes. We propose a model to explore the role of different parameters in the post-seismic redistribution of soil OC controlled by fluvial export and heterotrophic respiration. Applied to the Southern Alps, our results suggest that efficient OC fluvial export during the first decade after an earthquake promotes carbon sequestration.
Philippe Massicotte, Rainer M. W. Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Bélanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaëlle Chaillou, Malik Chami, Bruno Charrière, Jing Chen, Hervé Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Jens Ehn, Cédric Fichot, Marie-Hélène Forget, Pingqing Fu, Jonathan Gagnon, Nicole Garcia, Beat Gasser, Jean-François Ghiglione, Gaby Gorsky, Michel Gosselin, Priscillia Gourvil, Yves Gratton, Pascal Guillot, Hermann J. Heipieper, Serge Heussner, Stanford B. Hooker, Yannick Huot, Christian Jeanthon, Wade Jeffrey, Fabien Joux, Kimitaka Kawamura, Bruno Lansard, Edouard Leymarie, Heike Link, Connie Lovejoy, Claudie Marec, Dominique Marie, Johannie Martin, Jacobo Martín, Guillaume Massé, Atsushi Matsuoka, Vanessa McKague, Alexandre Mignot, William L. Miller, Juan-Carlos Miquel, Alfonso Mucci, Kaori Ono, Eva Ortega-Retuerta, Christos Panagiotopoulos, Tim Papakyriakou, Marc Picheral, Louis Prieur, Patrick Raimbault, Joséphine Ras, Rick A. Reynolds, André Rochon, Jean-François Rontani, Catherine Schmechtig, Sabine Schmidt, Richard Sempéré, Yuan Shen, Guisheng Song, Dariusz Stramski, Eri Tachibana, Alexandre Thirouard, Imma Tolosa, Jean-Éric Tremblay, Mickael Vaïtilingom, Daniel Vaulot, Frédéric Vaultier, John K. Volkman, Huixiang Xie, Guangming Zheng, and Marcel Babin
Earth Syst. Sci. Data, 13, 1561–1592, https://doi.org/10.5194/essd-13-1561-2021, https://doi.org/10.5194/essd-13-1561-2021, 2021
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The MALINA oceanographic expedition was conducted in the Mackenzie River and the Beaufort Sea systems. The sampling was performed across seven shelf–basin transects to capture the meridional gradient between the estuary and the open ocean. The main goal of this research program was to better understand how processes such as primary production are influencing the fate of organic matter originating from the surrounding terrestrial landscape during its transition toward the Arctic Ocean.
Jan de Leeuw, Michael P. Lamb, Gary Parker, Andrew J. Moodie, Daniel Haught, Jeremy G. Venditti, and Jeffrey A. Nittrouer
Earth Surf. Dynam., 8, 485–504, https://doi.org/10.5194/esurf-8-485-2020, https://doi.org/10.5194/esurf-8-485-2020, 2020
Gerard Salter, Vaughan R. Voller, and Chris Paola
Earth Surf. Dynam., 7, 911–927, https://doi.org/10.5194/esurf-7-911-2019, https://doi.org/10.5194/esurf-7-911-2019, 2019
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Bifurcations are the switches that steer water and sediment in delta and multithread river networks, playing an important role in shaping the landscape. In lab experiments, we found that when the downstream branches grow through time, frequent switching in the water and sediment partitioning occurs. In contrast, once sediment freely exits the downstream boundary, long periods of time when one branch dominates occur; however, unlike our theoretical prediction, these are not permanent.
Meng Zhao, Gerard Salter, Vaughan R. Voller, and Shuwang Li
Earth Surf. Dynam., 7, 505–513, https://doi.org/10.5194/esurf-7-505-2019, https://doi.org/10.5194/esurf-7-505-2019, 2019
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Typically, we think of a shoreline growing with a smooth line separating the land and the water. If the growth is unstable, however, the land–water front will exhibit a roughness that grows with time. Here we ask whether the growth of deltaic shorelines cab be unstable. Through mathematical analysis we show that growth is unstable when the shoreline is building onto an adverse slope. The length scale of the unstable signal in such a case, however, might be obscured by other geomorphic processes.
David G. Milledge, Alexander L. Densmore, Dino Bellugi, Nick J. Rosser, Jack Watt, Gen Li, and Katie J. Oven
Nat. Hazards Earth Syst. Sci., 19, 837–856, https://doi.org/10.5194/nhess-19-837-2019, https://doi.org/10.5194/nhess-19-837-2019, 2019
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Mitigating landslide risk requires information on landslide hazards on a suitable scale to inform decisions. We develop simple rules to identify landslide hazards and the probability of being hit by a landslide, then test their performance using six existing landslide inventories from recent earthquakes. We find that the best rules are "minimize your maximum look angle to the skyline" and "avoid steep (> 10˚) channels with many steep (> 40˚) areas that are upslope".
Mary E. Whelan, Sinikka T. Lennartz, Teresa E. Gimeno, Richard Wehr, Georg Wohlfahrt, Yuting Wang, Linda M. J. Kooijmans, Timothy W. Hilton, Sauveur Belviso, Philippe Peylin, Róisín Commane, Wu Sun, Huilin Chen, Le Kuai, Ivan Mammarella, Kadmiel Maseyk, Max Berkelhammer, King-Fai Li, Dan Yakir, Andrew Zumkehr, Yoko Katayama, Jérôme Ogée, Felix M. Spielmann, Florian Kitz, Bharat Rastogi, Jürgen Kesselmeier, Julia Marshall, Kukka-Maaria Erkkilä, Lisa Wingate, Laura K. Meredith, Wei He, Rüdiger Bunk, Thomas Launois, Timo Vesala, Johan A. Schmidt, Cédric G. Fichot, Ulli Seibt, Scott Saleska, Eric S. Saltzman, Stephen A. Montzka, Joseph A. Berry, and J. Elliott Campbell
Biogeosciences, 15, 3625–3657, https://doi.org/10.5194/bg-15-3625-2018, https://doi.org/10.5194/bg-15-3625-2018, 2018
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Measurements of the trace gas carbonyl sulfide (OCS) are helpful in quantifying photosynthesis at previously unknowable temporal and spatial scales. While CO2 is both consumed and produced within ecosystems, OCS is mostly produced in the oceans or from specific industries, and destroyed in plant leaves in proportion to CO2. This review summarizes the advancements we have made in the understanding of OCS exchange and applications to vital ecosystem water and carbon cycle questions.
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Physical: Geomorphology (including all aspects of fluvial, coastal, aeolian, hillslope and glacial geomorphology)
Haloturbation in the northern Atacama Desert revealed by a hidden subsurface network of calcium sulfate wedges
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Investigating uncertainty and parameter sensitivity in bedform analysis by using a Monte Carlo approach
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Surficial sediment remobilization by shear between sediment and water above tsunamigenic megathrust ruptures: experimental study
Terrace formation linked to outburst floods at the Diexi palaeo-landslide dam, upper Minjiang River, eastern Tibetan Plateau
Influence of alluvial slope on avulsion in river deltas
Pliocene shorelines and the epeirogenic motion of continental margins: a target dataset for dynamic topography models
Decadal-scale decay of landslide-derived fluvial suspended sediment after Typhoon Morakot
Role of the forcing sources in morphodynamic modelling of an embayed beach
A machine learning approach to the geomorphometric detection of ribbed moraines in Norway
Stream hydrology controls on ice cliff evolution and survival on debris-covered glaciers
Time-varying drainage basin development and erosion on volcanic edifices
Geomorphic risk maps for river migration using probabilistic modeling – a framework
Evolution of submarine canyons and hanging-wall fans: insights from geomorphic experiments and morphodynamic models
Riverine sediment response to deforestation in the Amazon basin
Physical modeling of ice-sheet-induced salt movements using the example of northern Germany
Downstream rounding rate of pebbles in the Himalaya
A physics-based model for fluvial valley width
Sub-surface processes and heat fluxes at coarse-blocky Murtèl rock glacier (Engadine, eastern Swiss Alps)
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Aline Zinelabedin, Joel Mohren, Maria Wierzbicka-Wieczorek, Tibor Janos Dunai, Stefan Heinze, and Benedikt Ritter
Earth Surf. Dynam., 13, 257–276, https://doi.org/10.5194/esurf-13-257-2025, https://doi.org/10.5194/esurf-13-257-2025, 2025
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In order to interpret the formation processes of subsurface salt wedges and polygonal patterned grounds from the northern Atacama Desert, we present a multi-methodological approach. Due to the high salt content of the wedges, we suggest that their formation is dominated by subsurface salt dynamics requiring moisture. We assume that the climatic conditions during the wedge growth were slightly wetter than today, offering the potential to use the wedges as palaeoclimate archives.
Alexander B. Prescott, Jon D. Pelletier, Satya Chataut, and Sriram Ananthanarayan
Earth Surf. Dynam., 13, 239–256, https://doi.org/10.5194/esurf-13-239-2025, https://doi.org/10.5194/esurf-13-239-2025, 2025
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Many Earth surface processes are controlled by the spatial pattern of surface water flow. We review commonly used methods for predicting such spatial patterns in digital landform models and document the pros and cons of commonly used methods. We propose a new method that is designed to minimize those limitations and show that it works well in a variety of test cases.
Jon D. Pelletier, Robert G. Hayes, Olivia Hoch, Brendan Fenerty, and Luke A. McGuire
Earth Surf. Dynam., 13, 219–238, https://doi.org/10.5194/esurf-13-219-2025, https://doi.org/10.5194/esurf-13-219-2025, 2025
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We demonstrate that landscapes with more planar initial conditions tend to have lower mean junction angles. Geomorphic processes on alluvial piedmonts result in especially planar initial conditions, consistent with a correlation between junction angles and the presence/absence of Late Cenozoic alluvial deposits and the constraint imposed by the intersection of planar approximations to the topography upslope from tributary junctions. We caution against using junction angles to infer paleoclimate.
Janbert Aarnink, Tom Beucler, Marceline Vuaridel, and Virginia Ruiz-Villanueva
Earth Surf. Dynam., 13, 167–189, https://doi.org/10.5194/esurf-13-167-2025, https://doi.org/10.5194/esurf-13-167-2025, 2025
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This study presents a novel convolutional-neural-network approach for detecting instream large wood in rivers, addressing the need for flexible monitoring methods across diverse data sources. Using a database of 15 228 fully labelled images, the model achieved a weighted mean average precision of 67 %. Fine-tuning parameters and sampling techniques can improve performance by over 10 % in some cases, offering valuable insights into ecosystem management.
Julius Reich and Axel Winterscheid
Earth Surf. Dynam., 13, 191–217, https://doi.org/10.5194/esurf-13-191-2025, https://doi.org/10.5194/esurf-13-191-2025, 2025
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Analyzing the geometry and the dynamics of riverine bedforms (so-called dune tracking) is important for various fields of application and contributes to sound and efficient river and sediment management. We developed a workflow that enables a robust estimation of bedform characteristics and with which comprehensive sensitivity analyses can be carried out. Using a field dataset, we show that the setting of input parameters in bedform analyses can have a significant impact on the results.
Abhishek Kashyap, Kristen L. Cook, and Mukunda Dev Behera
Earth Surf. Dynam., 13, 147–166, https://doi.org/10.5194/esurf-13-147-2025, https://doi.org/10.5194/esurf-13-147-2025, 2025
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Short-lived, high-magnitude flood events across high mountain regions leave substantial geomorphic imprints, which are frequently triggered by excess precipitation, glacial lake outbursts, and natural dam breaches. These catastrophic floods highlight the importance of understanding the complex interaction between climatic, hydrological, and geological forces in bedrock catchments. Extreme floods can have long-term geomorphic consequences on river morphology and fluvial processes.
Caroline Fenske, Jean Braun, François Guillocheau, and Cécile Robin
Earth Surf. Dynam., 13, 119–146, https://doi.org/10.5194/esurf-13-119-2025, https://doi.org/10.5194/esurf-13-119-2025, 2025
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We have developed a new numerical model to represent the formation of duricrusts, which are hard mineral layers found in soils and at the surface of the Earth. We assume that the formation mechanism implies variations in the height of the water table and that the hardening rate is proportional to precipitation. The model allows us to quantify the potential feedbacks they generate on the surface topography and the thickness of the regolith/soil layer.
Jens M. Turowski, Fergus McNab, Aaron Bufe, and Stefanie Tofelde
Earth Surf. Dynam., 13, 97–117, https://doi.org/10.5194/esurf-13-97-2025, https://doi.org/10.5194/esurf-13-97-2025, 2025
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Channel belts comprise the area affected by a river due to lateral migration and floods. As a landform, they affect water resources and flood hazard, and they often host unique ecological communities. We develop a model describing the evolution of channel-belt area over time. The model connects the behaviour of the river to the evolution of the channel belt over a timescale of centuries. A comparison to selected data from experiments and real river systems verifies the random walk approach.
Rémi Bossis, Vincent Regard, Sébastien Carretier, and Sandrine Choy
Earth Surf. Dynam., 13, 71–79, https://doi.org/10.5194/esurf-13-71-2025, https://doi.org/10.5194/esurf-13-71-2025, 2025
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The erosion of rocky coasts occurs episodically through wave action and landslides, constituting a major natural hazard. Documenting the factors that control the coastal retreat rate over millennia is fundamental to evidencing any change in time. However, the known rates to date are essentially representative of the last few decades. Here, we present a new method using the concentration of an isotope, 10Be, in sediment eroded from the cliff to quantify its retreat rate averaged over millennia.
Jean Vérité, Clément Narteau, Olivier Rozier, Jeanne Alkalla, Laurie Barrier, and Sylvain Courrech du Pont
Earth Surf. Dynam., 13, 23–39, https://doi.org/10.5194/esurf-13-23-2025, https://doi.org/10.5194/esurf-13-23-2025, 2025
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Using a numerical model in 2D, we study how two identical dunes interact with each other when exposed to reversing winds. Depending on the distance between the dunes, they either repel or attract each other until they reach an equilibrium distance, which is controlled by the wind strength, wind reversal frequency, and dune size. This process is controlled by the modification of wind flow over dunes of various shapes, influencing the sediment transport downstream.
Orie Cecil, Nicholas Cohn, Matthew Farthing, Sourav Dutta, and Andrew Trautz
Earth Surf. Dynam., 13, 1–22, https://doi.org/10.5194/esurf-13-1-2025, https://doi.org/10.5194/esurf-13-1-2025, 2025
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Using computational fluid dynamics, we analyze the error trends of an analytical shear stress distribution model used to drive aeolian transport for coastal dunes, which are an important line of defense against storm-related flooding hazards. We find that compared to numerical simulations, the analytical model results in a net overprediction of the landward migration rate. Additionally, two data-driven approaches are proposed for reducing the error while maintaining computational efficiency.
Hayden L. Jacobson, Danica L. Roth, Gabriel Walton, Margaret Zimmer, and Kerri Johnson
Earth Surf. Dynam., 12, 1415–1446, https://doi.org/10.5194/esurf-12-1415-2024, https://doi.org/10.5194/esurf-12-1415-2024, 2024
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Loose grains travel farther after a fire because no vegetation is left to stop them. This matters since loose grains at the base of a slope can turn into a debris flow if it rains. To find if grass growing back after a fire had different impacts on grains of different sizes on slopes of different steepness, we dropped thousands of natural grains and measured how far they went. Large grains went farther 7 months after the fire than 11 months after, and small grain movement didn’t change much.
Elizabeth N. Orr, Taylor F. Schildgen, Stefanie Tofelde, Hella Wittmann, and Ricardo N. Alonso
Earth Surf. Dynam., 12, 1391–1413, https://doi.org/10.5194/esurf-12-1391-2024, https://doi.org/10.5194/esurf-12-1391-2024, 2024
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Fluvial terraces and alluvial fans in the Toro Basin, NW Argentina, record river evolution and global climate cycles over time. Landform dating reveals lower-frequency climate cycles (100 kyr) preserved downstream and higher-frequency cycles (21/40 kyr) upstream, supporting theoretical predications that longer rivers filter out higher-frequency climate signals. This finding improves our understanding of the spatial distribution of sedimentary paleoclimate records within landscapes.
Fritz Schlunegger, Edi Kissling, Dimitri Tibo Bandou, Guilhem Amin Douillet, David Mair, Urs Marti, Regina Reber, Patrick Schläfli, and Michael Alfred Schwenk
Earth Surf. Dynam., 12, 1371–1389, https://doi.org/10.5194/esurf-12-1371-2024, https://doi.org/10.5194/esurf-12-1371-2024, 2024
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Overdeepenings are bedrock depressions filled with sediment. We combine the results of a gravity survey with drilling data to explore the morphology of such a depression beneath the city of Bern. We find that the target overdeepening comprises two basins >200 m deep. They are separated by a bedrock riegel that itself is cut by narrow canyons up to 150 m deep. We postulate that these structures formed underneath a glacier, where erosion by subglacial meltwater caused the formation of the canyons.
Loïs Ribet, Frédéric Liébault, Laurent Borgniet, Michaël Deschâtres, and Gabriel Melun
EGUsphere, https://doi.org/10.5194/egusphere-2024-3697, https://doi.org/10.5194/egusphere-2024-3697, 2024
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This work presents a protocol and a model to get the size of the pebbles in mountain rivers from Unmanned Aerial Vehicle images. A set of 12 rivers located in south-eastern France were photographed to build the model. The results show that the model has little error and should be usable for similar rivers. Grain-size of mountain rivers is an important parameter for environmental diagnostics by mapping the aquatic habitats and for flood management by estimating the pebbles fluxes during floods.
Stefan Hergarten
Earth Surf. Dynam., 12, 1315–1327, https://doi.org/10.5194/esurf-12-1315-2024, https://doi.org/10.5194/esurf-12-1315-2024, 2024
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Faceted topographies are impressive footprints of active tectonics in geomorphology. This paper investigates the evolution of faceted topographies at normal faults and their interaction with a river network theoretically and numerically. As a main result beyond several relations for the geometry of facets, the horizontal displacement associated with normal faults is crucial for the dissection of initially polygonal facets into triangular facets bounded by almost parallel rivers.
Lorenzo Durante, Nicoletta Tambroni, and Michele Bolla Pittaluga
EGUsphere, https://doi.org/10.5194/egusphere-2024-3552, https://doi.org/10.5194/egusphere-2024-3552, 2024
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River deltas are dynamic areas where rivers meet the sea. This study examines delta configurations to guide balanced development and environmental health. Using the Po River Delta, we developed a model to understand how different delta parts interact and maintain balance. Our findings show that deltas can reach varied states of balance, with some areas more prone to shift. These insights support predictions of delta changes and better management strategies.
Larry Syu-Heng Lai, Adam M. Booth, Alison R. Duvall, and Erich Herzig
EGUsphere, https://doi.org/10.5194/egusphere-2024-3415, https://doi.org/10.5194/egusphere-2024-3415, 2024
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pyTopoComplexity is an open-source tool that quantifies land surface complexity using advanced methods. Applied to a landslide-affected area in Washington, USA, it accurately analyzed landform features at various scales, enhancing our understanding of landform recovery after disturbances. By integrating with Landlab’s landscape evolution simulations, the software allows researchers to explore how different processes drive the evolution of surface complexity in response to natural forces.
Jessica Marggraf, Guillaume Dramais, Jérôme Le Coz, Blaise Calmel, Benoît Camenen, David J. Topping, William Santini, Gilles Pierrefeu, and François Lauters
Earth Surf. Dynam., 12, 1243–1266, https://doi.org/10.5194/esurf-12-1243-2024, https://doi.org/10.5194/esurf-12-1243-2024, 2024
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Suspended-sand fluxes in rivers vary with time and space, complicating their measurement. The proposed method captures the vertical and lateral variations of suspended-sand concentration throughout a river cross-section. It merges water samples taken at various positions throughout the cross-section with high-resolution acoustic velocity measurements. This is the first method that includes a fully applicable uncertainty estimation; it can easily be applied to any other study sites.
Dominic T. Robson and Andreas C. W. Baas
Earth Surf. Dynam., 12, 1205–1226, https://doi.org/10.5194/esurf-12-1205-2024, https://doi.org/10.5194/esurf-12-1205-2024, 2024
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Barchans are fast-moving sand dunes which form large populations (swarms) on Earth and Mars. We show that a small range of model parameters produces swarms in which dune size does not vary downwind – something that is observed in nature but not when using earlier models. We also show how the shape of dunes and the spatial patterns they form are affected by wind direction. This work furthers our understanding of the interplay between environmental drivers, dune interactions, and swarm properties.
Jeffrey Keck, Erkan Istanbulluoglu, Benjamin Campforts, Gregory Tucker, and Alexander Horner-Devine
Earth Surf. Dynam., 12, 1165–1191, https://doi.org/10.5194/esurf-12-1165-2024, https://doi.org/10.5194/esurf-12-1165-2024, 2024
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MassWastingRunout (MWR) is a new landslide runout model designed for sediment transport, landscape evolution, and hazard assessment applications. MWR is written in Python and includes a calibration utility that automatically determines best-fit parameters for a site and empirical probability density functions of each parameter for probabilistic model implementation. MWR and Jupyter Notebook tutorials are available as part of the Landlab package at https://github.com/landlab/landlab.
Ariane Mueting and Bodo Bookhagen
Earth Surf. Dynam., 12, 1121–1143, https://doi.org/10.5194/esurf-12-1121-2024, https://doi.org/10.5194/esurf-12-1121-2024, 2024
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This study investigates the use of optical PlanetScope data for offset tracking of the Earth's surface movement. We found that co-registration accuracy is locally degraded when outdated elevation models are used for orthorectification. To mitigate this bias, we propose to only correlate scenes acquired from common perspectives or base orthorectification on more up-to-date elevation models generated from PlanetScope data alone. This enables a more detailed analysis of landslide dynamics.
Cho-Hee Lee, Yeong Bae Seong, John Weber, Sangmin Ha, Dong-Eun Kim, and Byung Yong Yu
Earth Surf. Dynam., 12, 1091–1120, https://doi.org/10.5194/esurf-12-1091-2024, https://doi.org/10.5194/esurf-12-1091-2024, 2024
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Topographic metrics were used to understand changes due to tectonic activity. We evaluated the relative tectonic activity along the Ulsan Fault Zone (UFZ), one of the most active fault zones in South Korea. We divided the UFZ into five segments, based on the spatial variation in activity. We modeled the landscape evolution of the study area and interpreted tectono-geomorphic history during which the northern part of the UFZ experienced asymmetric uplift, while the southern part did not.
Juditha Aga, Livia Piermattei, Luc Girod, Kristoffer Aalstad, Trond Eiken, Andreas Kääb, and Sebastian Westermann
Earth Surf. Dynam., 12, 1049–1070, https://doi.org/10.5194/esurf-12-1049-2024, https://doi.org/10.5194/esurf-12-1049-2024, 2024
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Coastal rock cliffs on Svalbard are considered to be fairly stable; however, long-term trends in coastal-retreat rates remain unknown. This study examines changes in the coastline position along Brøggerhalvøya, Svalbard, using aerial images from 1970, 1990, 2010, and 2021. Our analysis shows that coastal-retreat rates accelerate during the period 2010–2021, which coincides with increasing storminess and retreating sea ice.
Aaron T. Steelquist, Gustav B. Seixas, Mary L. Gillam, Sourav Saha, Seulgi Moon, and George E. Hilley
Earth Surf. Dynam., 12, 1071–1089, https://doi.org/10.5194/esurf-12-1071-2024, https://doi.org/10.5194/esurf-12-1071-2024, 2024
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The rates at which rivers erode their bed can be used to interpret the geologic history of a region. However, these rates depend significantly on the time window over which you measure. We use multiple dating methods to determine an incision rate for the San Juan River and compare it to regional rates with longer timescales. We demonstrate how specific geologic events, such as cutoffs of bedrock meander bends, are likely to preserve material we can date but also bias the rates we measure.
Jingqiu Huang and Hugh D. Sinclair
EGUsphere, https://doi.org/10.5194/egusphere-2024-2600, https://doi.org/10.5194/egusphere-2024-2600, 2024
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This study uses radar technology to track tiny changes in riverbeds elevation in Himalayan Rivers as they flow onto the Gangetic Plains. By analyzing data from 2016 to 2021, we found that sediment builds up in seasonally dry (ephemeral) rivers during monsoon seasons, while the surrounding floodplains is sinking. This research is important for understanding how these elevation changes affect flood risks in rapidly growing communities in Nepal and India. Our findings can improve flood management.
Johannes Leinauer, Michael Dietze, Sibylle Knapp, Riccardo Scandroglio, Maximilian Jokel, and Michael Krautblatter
Earth Surf. Dynam., 12, 1027–1048, https://doi.org/10.5194/esurf-12-1027-2024, https://doi.org/10.5194/esurf-12-1027-2024, 2024
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Massive rock slope failures are a significant alpine hazard and change the Earth's surface. Therefore, we must understand what controls the preparation of such events. By correlating 4 years of slope displacements with meteorological and seismic data, we found that water from rain and snowmelt is the most important driver. Our approach is applicable to similar sites and indicates where future climatic changes, e.g. in rain intensity and frequency, may alter the preparation of slope failure.
Julien Coatléven and Benoit Chauveau
Earth Surf. Dynam., 12, 995–1026, https://doi.org/10.5194/esurf-12-995-2024, https://doi.org/10.5194/esurf-12-995-2024, 2024
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The aim of this paper is to explain how to incorporate classical water flow routines into landscape evolution models while keeping numerical errors under control. The key idea is to adapt filtering strategies to eliminate anomalous numerical errors and mesh dependencies, as confirmed by convergence tests with analytic solutions. The emergence of complex geomorphic structures is now driven exclusively by nonlinear heterogeneous physical processes rather than by random numerical artifacts.
Hasan Eslami, Erfan Poursoleymanzadeh, Mojtaba Hiteh, Keivan Tavakoli, Melika Yavari Nia, Ehsan Zadehali, Reihaneh Zarrabi, and Alessio Radice
EGUsphere, https://doi.org/10.5194/egusphere-2024-414, https://doi.org/10.5194/egusphere-2024-414, 2024
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A channel may be aggraded by overloaded sediment. In this study we realize an aggradation experiment and determine the celerity at which an aggradation wave, due to sediment overloading, migrates. We also investigate the celerity of small perturbations, as quantified based on mathematical formulations. The celerities of the two kinds are correlated with each other. However, the celerity of small perturbations is larger than the other one, that is less than a few percent of the water velocity.
Chloé Seibert, Cecilia McHugh, Chris Paola, Leonardo Seeber, and James Tucker
EGUsphere, https://doi.org/10.5194/egusphere-2024-2011, https://doi.org/10.5194/egusphere-2024-2011, 2024
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We propose a new mechanism of widespread surficial co-seismic sediment entrainment by seismic motions in subduction earthquakes. Our physical experiments show that shear from sediment-water relative velocities from long-period earthquake motions can mobilize synthetic fine marine sediment. High frequency vertical shaking can enhance this mobilization. According to our results, the largest tsunamigenic earthquakes that rupture to the trench may be distinguishable in the sedimentary record.
Jingjuan Li, John D. Jansen, Xuanmei Fan, Zhiyong Ding, Shugang Kang, and Marco Lovati
Earth Surf. Dynam., 12, 953–971, https://doi.org/10.5194/esurf-12-953-2024, https://doi.org/10.5194/esurf-12-953-2024, 2024
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In this study, we investigated the geomorphology, sedimentology, and chronology of Tuanjie (seven terraces) and Taiping (three terraces) terraces in Diexi, eastern Tibetan Plateau. Results highlight that two damming and three outburst events occurred in the area during the late Pleistocene, and the outburst floods have been a major factor in the formation of tectonically active mountainous river terraces. Tectonic activity and climatic changes play a minor role.
Octria A. Prasojo, Trevor B. Hoey, Amanda Owen, and Richard D. Williams
EGUsphere, https://doi.org/10.5194/egusphere-2024-2113, https://doi.org/10.5194/egusphere-2024-2113, 2024
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Decades of delta avulsion (i.e. channel abrupt jump) study has not resolved what the main controls of delta avulsion are. Using computer model, integrated with field observation, analytical and laboratory-made delta, we found that the sediment load, itself is controlled by the steepness of river upstream of a delta, controls the timing of avulsion. We can now better understand the main cause of abrupt channel changes on deltas, a finding that aids flood risk management in river deltas.
Andrew Hollyday, Maureen E. Raymo, Jacqueline Austermann, Fred Richards, Mark Hoggard, and Alessio Rovere
Earth Surf. Dynam., 12, 883–905, https://doi.org/10.5194/esurf-12-883-2024, https://doi.org/10.5194/esurf-12-883-2024, 2024
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Sea level was significantly higher during the Pliocene epoch, around 3 million years ago. The present-day elevations of shorelines that formed in the past provide a data constraint on the extent of ice sheet melt and the global sea level response under warm Pliocene conditions. In this study, we identify 10 escarpments that formed from wave-cut erosion during Pliocene times and compare their elevations with model predictions of solid Earth deformation processes to estimate past sea level.
Gregory A. Ruetenik, Ken L. Ferrier, and Odin Marc
Earth Surf. Dynam., 12, 863–881, https://doi.org/10.5194/esurf-12-863-2024, https://doi.org/10.5194/esurf-12-863-2024, 2024
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Fluvial sediment fluxes increased dramatically in Taiwan during Typhoon Morakot in 2009, which produced some of the heaviest landsliding on record. We analyzed fluvial discharge and suspended sediment concentration data at 87 gauging stations across Taiwan to quantify fluvial sediment responses since Morakot. In basins heavily impacted by landsliding, rating curve coefficients sharply increased during Morakot and then declined exponentially with a characteristic decay time of <10 years.
Nil Carrion-Bertran, Albert Falqués, Francesca Ribas, Daniel Calvete, Rinse de Swart, Ruth Durán, Candela Marco-Peretó, Marta Marcos, Angel Amores, Tim Toomey, Àngels Fernández-Mora, and Jorge Guillén
Earth Surf. Dynam., 12, 819–839, https://doi.org/10.5194/esurf-12-819-2024, https://doi.org/10.5194/esurf-12-819-2024, 2024
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The sensitivity to the wave and sea-level forcing sources in predicting a 6-month embayed beach evolution is assessed using two different morphodynamic models. After a successful model calibration using in situ data, other sources are applied. The wave source choice is critical: hindcast data provide wrong results due to an angle bias, whilst the correct dynamics are recovered with the wave conditions from an offshore buoy. The use of different sea-level sources gives no significant differences.
Thomas J. Barnes, Thomas V. Schuler, Simon Filhol, and Karianne S. Lilleøren
Earth Surf. Dynam., 12, 801–818, https://doi.org/10.5194/esurf-12-801-2024, https://doi.org/10.5194/esurf-12-801-2024, 2024
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In this paper, we use machine learning to automatically outline landforms based on their characteristics. We test several methods to identify the most accurate and then proceed to develop the most accurate to improve its accuracy further. We manage to outline landforms with 65 %–75 % accuracy, at a resolution of 10 m, thanks to high-quality/high-resolution elevation data. We find that it is possible to run this method at a country scale to quickly produce landform inventories for future studies.
Eric Petersen, Regine Hock, and Michael G. Loso
Earth Surf. Dynam., 12, 727–745, https://doi.org/10.5194/esurf-12-727-2024, https://doi.org/10.5194/esurf-12-727-2024, 2024
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Ice cliffs are melt hot spots that increase melt rates on debris-covered glaciers which otherwise see a reduction in melt rates. In this study, we show how surface runoff streams contribute to the generation, evolution, and survival of ice cliffs by carving into the glacier and transporting rocky debris. On Kennicott Glacier, Alaska, 33 % of ice cliffs are actively influenced by streams, while nearly half are within 10 m of streams.
Daniel O'Hara, Liran Goren, Roos M. J. van Wees, Benjamin Campforts, Pablo Grosse, Pierre Lahitte, Gabor Kereszturi, and Matthieu Kervyn
Earth Surf. Dynam., 12, 709–726, https://doi.org/10.5194/esurf-12-709-2024, https://doi.org/10.5194/esurf-12-709-2024, 2024
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Understanding how volcanic edifices develop drainage basins remains unexplored in landscape evolution. Using digital evolution models of volcanoes with varying ages, we quantify the geometries of their edifices and associated drainage basins through time. We find that these metrics correlate with edifice age and are thus useful indicators of a volcano’s history. We then develop a generalized model for how volcano basins develop and compare our results to basin evolution in other settings.
Brayden Noh, Omar Wani, Kieran B. J. Dunne, and Michael P. Lamb
Earth Surf. Dynam., 12, 691–708, https://doi.org/10.5194/esurf-12-691-2024, https://doi.org/10.5194/esurf-12-691-2024, 2024
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In this paper, we propose a framework for generating risk maps that provide the probabilities of erosion due to river migration. This framework uses concepts from probability theory to learn the river migration model's parameter values from satellite data while taking into account parameter uncertainty. Our analysis shows that such geomorphic risk estimation is more reliable than models that do not explicitly consider various sources of variability and uncertainty.
Steven Y. J. Lai, David Amblas, Aaron Micallef, and Hervé Capart
Earth Surf. Dynam., 12, 621–640, https://doi.org/10.5194/esurf-12-621-2024, https://doi.org/10.5194/esurf-12-621-2024, 2024
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This study explores the creation of submarine canyons and hanging-wall fans on active faults, which can be defined by gravity-dominated breaching and underflow-dominated diffusion processes. The study reveals the self-similarity in canyon–fan long profiles, uncovers Hack’s scaling relationship and proposes a formula to estimate fan volume using canyon length. This is validated by global data from source-to-sink systems, providing insights into deep-water sedimentary processes.
Anuska Narayanan, Sagy Cohen, and John R. Gardner
Earth Surf. Dynam., 12, 581–599, https://doi.org/10.5194/esurf-12-581-2024, https://doi.org/10.5194/esurf-12-581-2024, 2024
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This study investigates the profound impact of deforestation in the Amazon on sediment dynamics. Novel remote sensing data and statistical analyses reveal significant changes, especially in heavily deforested regions, with rapid effects within a year. In less disturbed areas, a 1- to 2-year lag occurs, influenced by natural sediment shifts and human activities. These findings highlight the need to understand the consequences of human activity for our planet's future.
Jacob Hardt, Tim P. Dooley, and Michael R. Hudec
Earth Surf. Dynam., 12, 559–579, https://doi.org/10.5194/esurf-12-559-2024, https://doi.org/10.5194/esurf-12-559-2024, 2024
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We investigate the reaction of salt structures on ice sheet transgressions. We used a series of sandbox models that enabled us to experiment with scaled-down versions of salt bodies from northern Germany. The strongest reactions occurred when large salt pillows were partly covered by the ice load. Subsurface salt structures may play an important role in the energy transition, e.g., as energy storage. Thus, it is important to understand all processes that affect their stability.
Prakash Pokhrel, Mikael Attal, Hugh D. Sinclair, Simon M. Mudd, and Mark Naylor
Earth Surf. Dynam., 12, 515–536, https://doi.org/10.5194/esurf-12-515-2024, https://doi.org/10.5194/esurf-12-515-2024, 2024
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Pebbles become increasingly rounded during downstream transport in rivers due to abrasion. This study quantifies pebble roundness along the length of two Himalayan rivers. We demonstrate that roundness increases with downstream distance and that the rates are dependent on rock type. We apply this to reconstructing travel distances and hence the size of ancient Himalaya. Results show that the ancient river network was larger than the modern one, indicating that there has been river capture.
Jens Martin Turowski, Aaron Bufe, and Stefanie Tofelde
Earth Surf. Dynam., 12, 493–514, https://doi.org/10.5194/esurf-12-493-2024, https://doi.org/10.5194/esurf-12-493-2024, 2024
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Fluvial valleys are ubiquitous landforms, and understanding their formation and evolution affects a wide range of disciplines from archaeology and geology to fish biology. Here, we develop a model to predict the width of fluvial valleys for a wide range of geographic conditions. In the model, fluvial valley width is controlled by the two competing factors of lateral channel mobility and uplift. The model complies with available data and yields a broad range of quantitative predictions.
Dominik Amschwand, Jonas Wicky, Martin Scherler, Martin Hoelzle, Bernhard Krummenacher, Anna Haberkorn, Christian Kienholz, and Hansueli Gubler
EGUsphere, https://doi.org/10.5194/egusphere-2024-172, https://doi.org/10.5194/egusphere-2024-172, 2024
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Rock glaciers are comparatively climate-resilient coarse-debris permafrost landforms. We estimate the energy budget of the seasonally thawing active layer (AL) of rock glacier Murtèl (Swiss Alps) based on a novel sub-surface sensor array. In the coarse-blocky AL during the thaw season, heat is transferred by thermal radiation and air convection. The ground heat flux is largely used to melt ground ice in the AL that protects to some degree the permafrost body beneath.
Daniel J. Ciarletta, Jennifer L. Miselis, Julie C. Bernier, and Arnell S. Forde
Earth Surf. Dynam., 12, 449–475, https://doi.org/10.5194/esurf-12-449-2024, https://doi.org/10.5194/esurf-12-449-2024, 2024
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We reconstructed the evolution of Fire Island, a barrier island in New York, USA, to identify drivers of landscape change. Results reveal Fire Island was once divided into multiple inlet-separated islands with distinct features. Later, inlets closed, and Fire Island’s landscape became more uniform as human activities intensified. The island is now less mobile and less likely to resist and recover from storm impacts and sea level rise. This vulnerability may exist for other stabilized barriers.
Pierre Dietrich, François Guillocheau, Guilhem Amin Douillet, Neil Patrick Griffis, Guillaume Baby, Daniel Paul Le Heron, Laurie Barrier, Maximilien Mathian, Isabel Patricia Montañez, Cécile Robin, Thomas Gyomlai, Christoph Kettler, and Axel Hofmann
EGUsphere, https://doi.org/10.5194/egusphere-2024-467, https://doi.org/10.5194/egusphere-2024-467, 2024
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At the evocation of ‘icy landscapes’, Africa is not the first place that comes to mind. The modern relief of Southern Africa is generally considered as resulting from uplift and counteracting erosion. We show that many modern reliefs of this region are fossil glacial landscapes tied to an ice age that occurred 300 million years ago: striated pavements, valleys, fjords. We emphasise how these landscapes have escaped being erased for hundreds of millions of years, generally considered improbable.
Chao Zhou, Xibin Tan, Yiduo Liu, and Feng Shi
Earth Surf. Dynam., 12, 433–448, https://doi.org/10.5194/esurf-12-433-2024, https://doi.org/10.5194/esurf-12-433-2024, 2024
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The drainage-divide stability provides new insights into both the river network evolution and the tectonic and/or climatic changes. Several methods have been proposed to determine the direction of drainage-divide migration. However, how to quantify the migration rate of drainage divides remains challenging. In this paper, we propose a new method to calculate the migration rate of drainage divides from high-resolution topographic data.
Moritz Altmann, Madlene Pfeiffer, Florian Haas, Jakob Rom, Fabian Fleischer, Tobias Heckmann, Livia Piermattei, Michael Wimmer, Lukas Braun, Manuel Stark, Sarah Betz-Nutz, and Michael Becht
Earth Surf. Dynam., 12, 399–431, https://doi.org/10.5194/esurf-12-399-2024, https://doi.org/10.5194/esurf-12-399-2024, 2024
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We show a long-term erosion monitoring of several sections on Little Ice Age lateral moraines with derived sediment yield from historical and current digital elevation modelling (DEM)-based differences. The first study period shows a clearly higher range of variability of sediment yield within the sites than the later periods. In most cases, a decreasing trend of geomorphic activity was observed.
Paul A. Carling
Earth Surf. Dynam., 12, 381–397, https://doi.org/10.5194/esurf-12-381-2024, https://doi.org/10.5194/esurf-12-381-2024, 2024
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Edge rounding in Shap granite glacial erratics is an irregular function of distance from the source outcrop in northern England, UK. Block shape is conservative, evolving according to block fracture mechanics – stochastic and silver ratio models – towards either of two attractor states. Progressive reduction in size occurs for blocks transported at the sole of the ice mass where the blocks are subject to compressive and tensile forces of the ice acting against a bedrock or till surface.
Cited articles
Agrawal, Y. C. and Pottsmith, H. C.: Instruments for particle size and settling velocity observations in sediment transport, Mar. Geol., 168, 89–114, https://doi.org/10.1016/S0025-3227(00)00044-X, 2000.
Agrawal, Y. C., Whitmire, A., Mikkelsen, O. A., and Pottsmith, H. C.: Light scattering by random shaped particles and consequences on measuring suspended sediments by laser diffraction, J. Geophys. Res.-Oceans, 113, C04023, https://doi.org/10.1029/2007JC004403, 2008.
Baptist, M. J., Babovic, V., Rodríguez Uthurburu, J., Keijzer, M., Uittenbogaard, R. E., Mynett, A., and Verwey, A.: On inducing equations for vegetation resistance, J. Hydraul. Res., 45, 435–450, https://doi.org/10.1080/00221686.2007.9521778, 2007.
Benson, T. and French, J. R.: InSiPID: A new low-cost instrument for in situ particle size measurements in estuarine and coastal waters, J. Sea Res., 58, 167–188, https://doi.org/10.1016/j.seares.2007.04.003, 2007.
Bevington, A. E., Twilley, R. R., Sasser, C. E., and Holm Jr, G. O.: Contribution of river floods, hurricanes, and cold fronts to elevation change in a deltaic floodplain, northern Gulf of Mexico, USA, Estuar. Coast. Shelf S., 191, 188–200, https://doi.org/10.1016/j.ecss.2017.04.010, 2017.
Blair, N. E. and Aller, R. C.: The Fate of Terrestrial Organic Carbon in the Marine Environment, Annu. Rev. Mar. Sci., 4, 401–423, https://doi.org/10.1146/annurev-marine-120709-142717, 2012.
Blum, M. D. and Roberts, H. H.: Drowning of the Mississippi Delta due to insufficient sediment supply and global sea-level rise, Nat. Geosci., 2, 488–491, https://doi.org/10.1038/ngeo553, 2009.
Bouchez, J., Galy, V., Hilton, R. G., Gaillardet, J., Moreira-Turcq, P., Pérez, M. A., France-Lanord, C., and Maurice, L.: Source, transport and fluxes of Amazon River particulate organic carbon: Insights from river sediment depth-profiles, Geochim. Cosmochim. Acta, 133, 280–298, https://doi.org/10.1016/j.gca.2014.02.032, 2014.
Braat, L., van Kessel, T., Leuven, J. R. F. W., and Kleinhans, M. G.: Effects of mud supply on large-scale estuary morphology and development over centuries to millennia, Earth Surf. Dynam., 5, 617–652, https://doi.org/10.5194/esurf-5-617-2017, 2017.
Brinkman, H. C.: A calculation of the viscous force exerted by a flowing fluid on a dense swarm of particles, Appl. Sci. Res., A1, 27–34, https://doi.org/10.1007/BF02120313, 1947.
Bushell, G. and Amal, R.: Fractal aggregates of polydisperse particles, J. Colloid Interf. Sci., 205, 459–469, https://doi.org/10.1006/jcis.1998.5667, 1998.
Bushell, G. and Amal, R.: Measurement of fractal aggregates of polydisperse particles using small-angle light scattering, J. Colloid Interf. Sci., 221, 186–194, https://doi.org/10.1006/jcis.1999.6532, 2000.
Carstens, M. R.: Accelerated motion of a spherical particle, Eos, Transactions American Geophysical Union, 33, 713–721, https://doi.org/10.1029/TR033i005p00713, 1952.
Chase, R. R.: Settling behavior of natural aquatic particulates, Limnol. Oceanogr., 24, 417–426, https://doi.org/10.4319/lo.1979.24.3.0417, 1979.
Cohen, S., Syvitski, J., Ashley, T., Lammers, R., Fekete, B., and Li, H.-Y.: Spatial trends and drivers of bedload and suspended sediment fluxes in global rivers, Water Resour. Res., 58, e2021WR031583, https://doi.org/10.1029/2021WR031583, 2022.
Craig, M. J., Baas, J. H., Amos, K. J., Strachan, L. J., Manning, A. J., Paterson, D. M., Hope, J. A., Nodder, S. D., and Baker, M. L.: Biomediation of submarine sediment gravity flow dynamics, Geology, 48, 72–76, https://doi.org/10.1130/G46837.1, 2020.
Csanady, G. T.: Turbulent diffusion of heavy particles in the atmosphere, J. Atmos. Sci., 20, 201–208, https://doi.org/10.1175/1520-0469(1963)020<0201:TDOHPI>2.0.CO;2, 1963.
Davies, C. N.: The separation of airborne dust and particles, P. I. Mech. Eng., 167, 185–213, https://doi.org/10.1177/002034835316701b13, 1953.
de Leeuw, J., Lamb, M. P., Parker, G., Moodie, A. J., Haught, D., Venditti, J. G., and Nittrouer, J. A.: Entrainment and suspension of sand and gravel, Earth Surf. Dynam., 8, 485–504, https://doi.org/10.5194/esurf-8-485-2020, 2020.
Deng, Z., He, Q., Manning, A. J., and Chassagne, C.: A laboratory study on the behavior of estuarine sediment flocculation as function of salinity, EPS and living algae, Mar. Geol., 459, 107029, https://doi.org/10.1016/j.margeo.2023.107029, 2023.
Derjaguin, B. V. and Landau, L.: Theory of the stability of strongly charged lyophobic sol and of the adhesion of strongly charged particles in solutions of electrolytes, Acta Physico Chimica URSS, 14, 633–662, 1941.
Dietrich, W. E.: Settling velocity of natural particles, Water Resour. Res., 18, 1615–1626, https://doi.org/10.1029/WR018i006p01615, 1982.
Dong, S., Subhas, A. V., Rollins, N. E., Naviaux, J. D., Adkins, J. F., and Berelson, W. M.: A kinetic pressure effect on calcite dissolution in seawater, Geochim. Cosmochim. Acta, 238, 411–423, https://doi.org/10.1016/j.gca.2018.07.015, 2018.
Douglas, M. M., Li, G. K., Fischer, W. W., Rowland, J. C., Kemeny, P. C., West, A. J., Schwenk, J., Piliouras, A. P., Chadwick, A. J., and Lamb, M. P.: Organic carbon burial by river meandering partially offsets bank erosion carbon fluxes in a discontinuous permafrost floodplain, Earth Surf. Dynam., 10, 421–435, https://doi.org/10.5194/esurf-10-421-2022, 2022.
Droppo, I. G. and Ongley, E. D.: Flocculation of suspended sediment in rivers of southeastern Canada, Water Res., 28, 1799–1809, https://doi.org/10.1016/0043-1354(94)90253-4, 1994.
Dunne, K. B. J., Nittrouer, J. A., Abolfazli, E., Osborn, R., and Strom, K. B.: Hydrodynamically-driven deposition of mud in river systems, Geophys. Res. Lett., 51, e2023GL107174, https://doi.org/10.1029/2023GL107174, 2024.
Dyer, K. R. and Manning, A. J.: Observation of the size, settling velocity and effective density of flocs, and their fractal dimensions, J. Sea Res., 41, 87–95, https://doi.org/10.1016/S1385-1101(98)00036-7, 1999.
Edwards, T. K. and Glysson, G. D.: Field methods for measurement of fluvial sediment, US Geological Survey Denver, CO, 1999.
Eisma, D.: Flocculation and de-flocculation of suspended matter in estuaries, Netherlands J. Sea Res., 20, 183–199, https://doi.org/10.1016/0077-7579(86)90041-4, 1986.
Eisma, D., Cadée, G. C., Laane, R., and Kalf, J.: Preliminary results of AURELIA-and NAVICULA Cruises in the Rhine-and Ems-estuaries, January–February, 1982, Mitteilungen aus dem Geologisch-Paläontologischen Institut der Universität Hamburg, 633–654, ISSN 0072-1115, 1982.
Ferguson, R. I. and Church, M.: A Simple Universal Equation for Grain Settling Velocity, J. Sediment. Res., 74, 933–937, https://doi.org/10.1306/051204740933, 2004.
Fichot, C. and Harringmeyer, J.: Delta-X: In situ Beam Attenuation and Particle Size from LISST-200X, 2021, ORNL DAAC [data set], https://doi.org/10.3334/ORNLDAAC/2077, 2021.
Galy, V., Beyssac, O., France-Lanord, C., and Eglinton, T.: Recycling of graphite during Himalayan erosion: a geological stabilization of carbon in the crust, Science, 322, 943–945, https://doi.org/10.1126/science.1161408, 2008.
García, M.: Sedimentation Engineering: Processes, Measurements, Modeling, and Practice, ASCE Manuals and Reports on Engineering Practice No. 110, American Society of Civil Engineers, 1132 pp., https://doi.org/10.1061/9780784408148, 2008.
Geider, R. J., Delucia, E. H., Falkowski, P. G., Finzi, A. C., Grime, J. P., Grace, J., Kana, T. M., La Roche, J., Long, S. P., and Osborne, B. A.: Primary productivity of planet earth: biological determinants and physical constraints in terrestrial and aquatic habitats, Glob. Change Biol., 7, 849–882, https://doi.org/10.1046/j.1365-2486.2001.00448.x, 2001.
Geleynse, N., Hiatt, M., Sangireddy, H., and Passalacqua, P.: Identifying environmental controls on the shoreline of a natural river delta, J. Geophys. Res.-Earth, 120, 877–893, https://doi.org/10.1002/2014JF003408, 2015.
Gibbs, R. J.: Estuarine flocs: their size, settling velocity and density, J. Geophys. Res.-Oceans, 90, 3249–3251, https://doi.org/10.1029/JC090iC02p03249, 1985.
Gmachowski, L.: Mass–radius relation for fractal aggregates of polydisperse particles, Colloid. Surface A, 224, 45–52, https://doi.org/10.1016/S0927-7757(03)00318-2, 2003.
Graf, W. H. and Cellino, M.: Suspension flows in open channels; experimental study, J. Hydraul. Res., 40, 435–447, https://doi.org/10.1080/00221680209499886, 2002.
Graham, G. W., Davies, E. J., Nimmo-Smith, W. A. M., Bowers, D. G., and Braithwaite, K. M.: Interpreting LISST-100X measurements of particles with complex shape using digital in-line holography, J. Geophys. Res.-Oceans, 117, C05034, https://doi.org/10.1029/2011JC007613, 2012.
Gregory, J. and Barany, S.: Adsorption and flocculation by polymers and polymer mixtures, Adv. Colloid Interfac., 169, 1–12, https://doi.org/10.1016/j.cis.2011.06.004, 2011.
Guo, L. and He, Q.: Freshwater flocculation of suspended sediments in the Yangtze River, China, Ocean Dynam., 61, 371–386, https://doi.org/10.1007/s10236-011-0391-x, 2011.
Hill, P. S., Milligan, T. G., and Geyer, W. R.: Controls on effective settling velocity of suspended sediment in the Eel River flood plume, Cont. Shelf Res., 20, 2095–2111, https://doi.org/10.1016/S0278-4343(00)00064-9, 2000.
Hill, P. S., Voulgaris, G., and Trowbridge, J. H.: Controls on floc size in a continental shelf bottom boundary layer, J. Geophys. Res.-Oceans, 106, 9543–9549, https://doi.org/10.1029/2000JC900102, 2001.
Holm, G. O. and Sasser, C. E.: Differential salinity response between two Mississippi River subdeltas: implications for changes in plant composition, Estuaries, 24, 78–89, https://doi.org/10.2307/1352815, 2001.
Izquierdo–Ayala, K., Garcia–Aragon, J. A., Castillo–Uzcanga, M. M., and Salinas-Tapia, H.: Freshwater flocculation dependence on turbulence properties in the Usumacinta river, J. Hydraul. Eng., 147, 05021009, https://doi.org/10.1061/(ASCE)HY.1943-7900.0001940, 2021.
Izquierdo-Ayala, K., García-Aragón, J. A., Castillo-Uzcanga, M. M., Díaz-Delgado, C., Carrillo, L., and Salinas-Tapia, H.: Flocculation Patterns Related to Intra-Annual Hydrodynamics Variability in the Lower Grijalva-Usumacinta System, Water, 15, 292, https://doi.org/10.3390/w15020292, 2023.
Jarvis, P., Jefferson, B., and Parsons, S. A.: Measuring floc structural characteristics, Rev. Environ. Sci. Bio, 4, 1–18, https://doi.org/10.1007/s11157-005-7092-1, 2005.
Jensen, D. J., Cavanaugh, K. C., Thompson, D. R., Fagherazzi, S., Cortese, L., and Simard, M.: Leveraging the historical Landsat catalog for a remote sensing model of wetland accretion in coastal Louisiana, J. Geophys. Res.-Biogeo., 127, e2022JG006794, https://doi.org/10.1029/2022JG006794, 2022.
Johnson, C. P., Li, X., and Logan, B. E.: Settling velocities of fractal aggregates, Environ. Sci. Technol., 30, 1911–1918, https://doi.org/10.1021/es950604g, 1996.
Keyvani, A. and Strom, K.: A fully-automated image processing technique to improve measurement of suspended particles and flocs by removing out-of-focus objects, Comput. Geosci., 52, 189–198, https://doi.org/10.1016/j.cageo.2012.08.018, 2013.
Kim, A. S. and Stolzenbach, K. D.: The permeability of synthetic fractal aggregates with realistic three-dimensional structure, J. Colloid Interf. Sci., 253, 315–328, https://doi.org/10.1006/jcis.2002.8525, 2002.
Kranck, K.: The Role of Flocculation in the Filtering of Particulate Matter in Estuaries, in: The Estuary as a Filter, edited by: Kennedy, V. S., Academic Press, https://doi.org/10.1016/B978-0-12-405070-9.50014-1, 1984.
Kranck, K. and Milligan, T.: Macroflocs: production of marine snow in the laboratory, Mar. Ecol. Prog. Ser., 3, 19–24, 1980.
Kranenburg, C.: The fractal structure of cohesive sediment aggregates, Estuar. Coast. Shelf S., 39, 451–460, https://doi.org/10.1016/S0272-7714(06)80002-8, 1994.
Krishnappan, B. G.: In situ size distribution of suspended particles in the Fraser River, J. Hydraul. Eng., 126, 561–569, https://doi.org/10.1061/(ASCE)0733-9429(2000)126:8(561), 2000.
Kuprenas, R., Tran, D., and Strom, K.: A Shear-Limited Flocculation Model for Dynamically Predicting Average Floc Size, J. Geophys. Res.-Oceans, 123, 6736–6752, https://doi.org/10.1029/2018JC014154, 2018.
Lamb, M. P., De Leeuw, J., Fischer, W. W., Moodie, A. J., Venditti, J. G., Nittrouer, J. A., Haught, D., and Parker, G.: Mud in rivers transported as flocculated and suspended bed material, Nat. Geosci., 13, 566–570, https://doi.org/10.1038/s41561-020-0602-5, 2020.
Larsen, L. G., Harvey, J. W., and Crimaldi, J. P.: Morphologic and transport properties of natural organic floc, Water Resour. Res., 45, https://doi.org/10.1029/2008WR006990, 2009.
Latimer, R. A. and Schweizer, C. W.: The Atchafalaya River Study: a report based upon engineering and geological studies of the enlargement of Old and Atchafalaya Rivers, United States Army Corps of Engineers, http://hdl.handle.net/11681/30764 (last access: 7 November 2024), 1951.
Lawrence, T. J., Carr, S. J., Wheatland, J. A. T., Manning, A. J., and Spencer, K. L.: Quantifying the 3D structure and function of porosity and pore space in natural sediment flocs, J. Soil. Sediment., 22, 3176–3188, https://doi.org/10.1007/s11368-022-03304-x, 2022.
Lawrence, T. J., Carr, S. J., Manning, A. J., Wheatland, J. A. T., Bushby, A. J., and Spencer, K. L.: Functional behaviour of flocs explained by observed 3D structure and porosity, Front. Earth Sci., 11, 1264953, https://doi.org/10.3389/feart.2023.1264953, 2023.
Lee, B. J., Kim, J., Hur, J., Choi, I. H., Toorman, E. A., Fettweis, M., and Choi, J. W.: Seasonal Dynamics of Organic Matter Composition and Its Effects on Suspended Sediment Flocculation in River Water, Water Resour. Res., 55, 6968–6985, https://doi.org/10.1029/2018WR024486, 2019.
Li, X. and Logan, B. E.: Collision frequencies of fractal aggregates with small particles by differential sedimentation, Environ. Sci. Technol., 31, 1229–1236, https://doi.org/10.1021/es960771w, 1997.
Li, X.-Y. and Logan, B. E.: Permeability of fractal aggregates, Water Res., 35, 3373–3380, https://doi.org/10.1016/S0043-1354(01)00061-6, 2001.
Livsey, D. N., Crosswell, J. R., Turner, R. D. R., Steven, A. D. L., and Grace, P. R.: Flocculation of Riverine Sediment Draining to the Great Barrier Reef, Implications for Monitoring and Modeling of Sediment Dispersal Across Continental Shelves, J. Geophys. Res.-Oceans, 127, e2021JC017988, https://doi.org/10.1029/2021JC017988, 2022.
Malarkey, J., Baas, J. H., Hope, J. A., Aspden, R. J., Parsons, D. R., Peakall, J., Paterson, D. M., Schindler, R. J., Ye, L., and Lichtman, I. D.: The pervasive role of biological cohesion in bedform development, Nat. Commun., 6, 6257, https://doi.org/10.1038/ncomms7257, 2015.
Malvern Panalytical: Mastersizer User Guide, https://www.malvernpanalytical.com/en/learn/knowledge-center/user-manuals/man0474en, last access: 5 November 2024.
Manning, A. J. and Dyer, K. R.: Mass settling flux of fine sediments in Northern European estuaries: measurements and predictions, Mar. Geol., 245, 107–122, https://doi.org/10.1016/j.margeo.2007.07.005, 2007.
Manning, A. J., Baugh, J. V., Spearman, J. R., and Whitehouse, R. J.: Flocculation settling characteristics of mud: sand mixtures, Ocean Dynam., 60, 237–253, https://doi.org/10.1007/s10236-009-0251-0, 2010.
Mayer, L. M.: Surface area control of organic carbon accumulation in continental shelf sediments, Geochim. Cosmochim. Acta, 58, 1271–1284, https://doi.org/10.1016/0016-7037(94)90381-6, 1994.
McCave, I. N.: Size spectra and aggregation of suspended particles in the deep ocean, Deep-Sea Res., 31, 329–352, https://doi.org/10.1016/0198-0149(84)90088-8, 1984.
McNown, J. S. and Malaika, J.: Effects of particle shape on settling velocity at low Reynolds numbers, Eos, Transactions American Geophysical Union, 31, 74–82, https://doi.org/10.1029/TR031i001p00074, 1950.
Mehta, A. J. and Partheniades, E.: An investigation of the depositional properties of flocculated fine sediments, J. Hydraul. Res., 13, 361–381, https://doi.org/10.1080/00221687509499694, 1975.
Mietta, F., Chassagne, C., Manning, A. J., and Winterwerp, J. C.: Influence of shear rate, organic matter content, pH and salinity on mud flocculation, Ocean Dynam., 59, 751–763, https://doi.org/10.1007/s10236-009-0231-4, 2009.
Mikkelsen, O. and Pejrup, M.: The use of a LISST-100 laser particle sizer for in-situ estimates of floc size, density and settling velocity, Geo-Mar. Lett., 20, 187–195, https://doi.org/10.1007/s003670100064, 2001.
Mikkelsen, O. A., Milligan, T. G., Hill, P. S., and Moffatt, D.: INSSECT–an instrumented platform for investigating floc properties close to the seabed, Limnol. Oceanogr.-Meth., 2, 226–236, https://doi.org/10.4319/lom.2004.2.226, 2004.
Mikkelsen, O. A., Hill, P. S., Milligan, T. G., and Chant, R. J.: In situ particle size distributions and volume concentrations from a LISST-100 laser particle sizer and a digital floc camera, Cont. Shelf Res., 25, 1959–1978, https://doi.org/10.1016/j.csr.2005.07.001, 2005.
Mikkelsen, O. A., Hill, P. S., and Milligan, T. G.: Seasonal and spatial variation of floc size, settling velocity, and density on the inner Adriatic Shelf (Italy), Cont. Shelf Res., 27, 417–430, https://doi.org/10.1016/j.csr.2006.11.004, 2007.
Moodie, A. J., Nittrouer, J. A., Ma, H., Carlson, B. N., Wang, Y., Lamb, M. P., and Parker, G.: Suspended‐sediment induced stratification inferred from concentration and velocity profile measurements in the lower Yellow River, China, Water Resour. Res., 58, e2020WR027192, https://doi.org/10.1029/2020WR027192, 2020.
NASA Delta-X: Delta-X ORNL DAAC [data set], https://daac.ornl.gov/cgi-bin/dataset_lister.pl?p=41, last access: 5 November 2024.
Neale, G., Epstein, N., and Nader, W.: Creeping flow relative to permeable spheres, Chem. Eng. Sci., 28, 1865–1874, https://doi.org/10.1016/0009-2509(73)85070-5, 1973.
Nelson, C. H. and Lamothe, P. J.: Heavy metal anomalies in the Tinto and Odiel river and estuary system, Spain, Estuaries, 16, 496–511, https://doi.org/10.2307/1352597, 1993.
Nezu, I. and Nakagawa, H.: Turbulence in Open-Channel Flows, Routledge, London, 293 pp., https://doi.org/10.1201/9780203734902, 1993.
Nghiem, J., Salter, G., and Lamb, M. P.: Delta-X: Bed and Suspended Sediment Grain Size, MRD, LA, USA, 2021, Version 2, ORNL DAAC [data set], https://doi.org/10.3334/ORNLDAAC/2135, 2021.
Nghiem, J. A., Fischer, W. W., Li, G. K., and Lamb, M. P.: A Mechanistic Model for Mud Flocculation in Freshwater Rivers, J. Geophys. Res.-Earth, 127, e2021JF006392, https://doi.org/10.1029/2021JF006392, 2022.
Nghiem, J. A., Li, G. K., Harringmeyer, J. P., Salter, G., Fichot, C. G., and Lamb, M. P.: Data for “Testing floc settling velocity models in rivers and freshwater wetlands”, CaltechDATA [data set], https://doi.org/10.22002/w4ave-nrg52, 2024.
Nicholas, A. P. and Walling, D. E.: The significance of particle aggregation in the overbank deposition of suspended sediment on river floodplains, J. Hydrol., 186, 275–293, https://doi.org/10.1016/S0022-1694(96)03023-5, 1996.
Osborn, R., Dillon, B., Tran, D., Abolfazli, E., Dunne, K. B., Nittrouer, J. A., and Strom, K.: FlocARAZI: an in-situ, image-based profiling instrument for sizing solid and flocculated suspended sediment, J. Geophys. Res.-Earth, 126, e2021JF006210, https://doi.org/10.1029/2021JF006210, 2021.
Osborn, R., Dunne, K. B., Ashley, T., Nittrouer, J. A., and Strom, K.: The flocculation state of mud in the lowermost freshwater reaches of the Mississippi River: spatial distribution of sizes, seasonal changes, and their impact on vertical concentration profiles, J. Geophys. Res.-Earth, 128, e2022JF006975, https://doi.org/10.1029/2022JF006975, 2023.
Özer, M., Orhan, M., and Işik, N. S.: Effect of particle optical properties on size distribution of soils obtained by laser diffraction, Environ. Eng. Geosci., 16, 163–173, https://doi.org/10.2113/gseegeosci.16.2.163, 2010.
Parsons, D. R., Schindler, R. J., Hope, J. A., Malarkey, J., Baas, J. H., Peakall, J., Manning, A. J., Ye, L., Simmons, S., and Paterson, D. M.: The role of biophysical cohesion on subaqueous bed form size, Geophys. Res. Lett., 43, 1566–1573, https://doi.org/10.1002/2016GL067667, 2016.
Partheniades, E.: Erosion and deposition of cohesive soils, J. Hydr. Eng. Div., 91, 105–139, https://doi.org/10.1061/JYCEAJ.0001165, 1965.
Phillips, C. B., Masteller, C. C., Slater, L. J., Dunne, K. B., Francalanci, S., Lanzoni, S., Merritts, D. J., Lajeunesse, E., and Jerolmack, D. J.: Threshold constraints on the size, shape and stability of alluvial rivers, Nature Reviews Earth & Environment, 3, 406–419, https://doi.org/10.1038/s43017-022-00282-z, 2022.
Pizzuto, J. E.: Long-term storage and transport length scale of fine sediment: Analysis of a mercury release into a river, Geophys. Res. Lett., 41, 5875–5882, https://doi.org/10.1002/2014GL060722, 2014.
Rawle, A. F.: Best practice in laser diffraction–a robustness study of the optical properties of silica, Procedia Engineer., 102, 182–189, https://doi.org/10.1016/j.proeng.2015.01.124, 2015.
Roberts, H. H., Adams, R. D., and Cunningham, R. H. W.: Evolution of sand-dominant subaerial phase, Atchafalaya Delta, Louisiana, AAPG Bull., 64, 264–279, https://doi.org/10.1306/2F918964-16CE-11D7-8645000102C1865D, 1980.
Roberts, W., Le Hir, P., and Whitehouse, R. J. S.: Investigation using simple mathematical models of the effect of tidal currents and waves on the profile shape of intertidal mudflats, Cont. Shelf Res., 20, 1079–1097, https://doi.org/10.1016/S0278-4343(00)00013-3, 2000.
Rommelfanger, N., Vowinckel, B., Wang, Z., Dohrmann, R., Meiburg, E., and Luzzatto-Fegiz, P.: A simple criterion and experiments for onset of flocculation in kaolin clay suspensions, arXiv [preprint], https://doi.org/10.48550/arXiv.2203.15545, 2022.
Rouse, H.: Modern conceptions of the mechanics of fluid turbulence, T. Am. Soc. Civ. Eng., 102, 463–505, https://doi.org/10.1061/TACEAT.0004872, 1937.
Schindler, R. J., Parsons, D. R., Ye, L., Hope, J. A., Baas, J. H., Peakall, J., Manning, A. J., Aspden, R. J., Malarkey, J., and Simmons, S.: Sticky stuff: Redefining bedform prediction in modern and ancient environments, Geology, 43, 399–402, https://doi.org/10.1130/G36262.1, 2015.
Sequoia Scientific: LISST-200X Particle Size Analyzer User's Manual, https://www.sequoiasci.com/wp-content/uploads/2016/02/LISST-200X_Users_Manual_v2_35.pdf (last access: 5 November 2024), 2022.
Shen, X., Lee, B. J., Fettweis, M., and Toorman, E. A.: A tri-modal flocculation model coupled with TELEMAC for estuarine muds both in the laboratory and in the field, Water Res., 145, 473–486, https://doi.org/10.1016/j.watres.2018.08.062, 2018.
Smellie, R. H. and LaMer, V. K.: Flocculation, subsidence and filtration of phosphate slimes: VI. A quantitative theory of filtration of flocculated suspensions, J. Coll. Sci. Imp. U. Tok., 13, 589–599, https://doi.org/10.1016/0095-8522(58)90071-0, 1958.
Smith, J. D. and McLean, S. R.: Spatially averaged flow over a wavy surface, J. Geophys. Res., 82, 1735–1746, https://doi.org/10.1029/JC082i012p01735, 1977.
Smith, S. J. and Friedrichs, C. T.: Image processing methods for in situ estimation of cohesive sediment floc size, settling velocity, and density, Limnol. Oceanogr.-Meth., 13, 250–264, https://doi.org/10.1002/lom3.10022, 2015.
Son, M. and Hsu, T.-J.: The effects of flocculation and bed erodibility on modeling cohesive sediment resuspension, J. Geophys. Res.-Oceans, 116, C03021, https://doi.org/10.1029/2010JC006352, 2011.
Soulsby, R. L. and Dyer, K. R.: The form of the near-bed velocity profile in a tidally accelerating flow, J. Geophys. Res.-Oceans, 86, 8067–8074, https://doi.org/10.1029/JC086iC09p08067, 1981.
Soulsby, R. L., Manning, A. J., Spearman, J., and Whitehouse, R. J. S.: Settling velocity and mass settling flux of flocculated estuarine sediments, Mar. Geol., 339, 1–12, https://doi.org/10.1016/j.margeo.2013.04.006, 2013.
Spencer, K. L., Wheatland, J. A., Bushby, A. J., Carr, S. J., Droppo, I. G., and Manning, A. J.: A structure–function based approach to floc hierarchy and evidence for the non-fractal nature of natural sediment flocs, Sci. Rep., 11, 1–10, https://doi.org/10.1038/s41598-021-93302-9, 2021.
Stokes, G. G.: On the effect of the internal friction of fluids on the motion of pendulums, Transactions of the Cambridge Philosophical Society, 9, 8–106, 1851.
Strom, K. and Keyvani, A.: An explicit full-range settling velocity equation for mud flocs, J. Sediment. Res., 81, 921–934, https://doi.org/10.2110/jsr.2011.62, 2011.
Syvitski, J. P., Asprey, K. W., and Leblanc, K. W. G.: In-situ characteristics of particles settling within a deep-water estuary, Deep-Sea Res. Pt. II, 42, 223–256, https://doi.org/10.1016/0967-0645(95)00013-G, 1995.
Syvitski, J. P., Kettner, A. J., Overeem, I., Hutton, E. W., Hannon, M. T., Brakenridge, G. R., Day, J., Vörösmarty, C., Saito, Y., and Giosan, L.: Sinking deltas due to human activities, Nat. Geosci., 2, 681–686, https://doi.org/10.1038/ngeo629, 2009.
Tambo, N. and Watanabe, Y.: Physical characteristics of flocs–I. The floc density function and aluminium floc, Water Res., 13, 409–419, https://doi.org/10.1016/0043-1354(79)90033-2, 1979.
Tennekes, H. and Lumley, J. L.: A First Course in Turbulence, MIT Press, 320 pp., ISBN 9780262536301, 1972.
Tran, D. and Strom, K.: Floc sizes and resuspension rates from fresh deposits: Influences of suspended sediment concentration, turbulence, and deposition time, Estuar. Coast. Shelf S., 229, 106397, https://doi.org/10.1016/j.ecss.2019.106397, 2019.
Tran, D., Kuprenas, R., and Strom, K.: How do changes in suspended sediment concentration alone influence the size of mud flocs under steady turbulent shearing?, Cont. Shelf Res., 158, 1–14, https://doi.org/10.1016/j.csr.2018.02.008, 2018.
Van Leussen, W.: Aggregation of Particles, Settling Velocity of Mud Flocs A Review, in: Physical Processes in Estuaries, Berlin, Heidelberg, 347–403, https://doi.org/10.1007/978-3-642-73691-9_19, 1988.
Verwey, E. J. W.: Theory of the stability of lyophobic colloids, J. Phys. Chem., 51, 631–636, https://doi.org/10.1021/j150453a001, 1947.
Walling, D. E. and Fang, D.: Recent trends in the suspended sediment loads of the world's rivers, Global Planet. Change, 39, 111–126, https://doi.org/10.1016/S0921-8181(03)00020-1, 2003.
West, A. J., Galy, A., and Bickle, M.: Tectonic and climatic controls on silicate weathering, Earth Planet. Sc. Lett., 235, 211–228, https://doi.org/10.1016/j.epsl.2005.03.020, 2005.
Whitehouse, R., Soulsby, R., Roberts, W., and Mitchener, H.: Dynamics of estuarine muds, Thomas Telford, London, ISBN 9780727728647, 2000.
Winterwerp, J. C.: A simple model for turbulence induced flocculation of cohesive sediment, J. Hydraul. Res., 36, 309–326, https://doi.org/10.1080/00221689809498621, 1998.
Woodfield, D. and Bickert, G.: An improved permeability model for fractal aggregates settling in creeping flow, Water Res., 35, 3801–3806, https://doi.org/10.1016/S0043-1354(01)00128-2, 2001.
Wright, S. and Parker, G.: Density stratification effects in sand-bed rivers, J. Hydraul. Eng., 130, 783–795, https://doi.org/10.1061/(ASCE)0733-9429(2004)130:8(783), 2004.
Xu, F., Wang, D.-P., and Riemer, N.: Modeling flocculation processes of fine-grained particles using a size-resolved method: comparison with published laboratory experiments, Cont. Shelf Res., 28, 2668–2677, https://doi.org/10.1016/j.csr.2008.09.001, 2008.
Yu, X. and Somasundaran, P.: Role of polymer conformation in interparticle-bridging dominated flocculation, J. Colloid Interf. Sci., 177, 283–287, https://doi.org/10.1006/jcis.1996.0033, 1996.
Zeichner, S. S., Nghiem, J., Lamb, M. P., Takashima, N., De Leeuw, J., Ganti, V., and Fischer, W. W.: Early plant organics increased global terrestrial mud deposition through enhanced flocculation, Science, 371, 526–529, https://doi.org/10.1126/science.abd0379, 2021.
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Nghiem et al. calibrate and validate floc settling velocity models in freshwater, highlighting the controls on rates of sedimentation and organic carbon burial. The findings resolve discrepancies between observations and Stokes law-based models, which rely on floc characteristics like diameter, permeability, and fractal properties. This research advances our understanding of fine particle dynamics and their role in landscape evolution.
Nghiem et al. calibrate and validate floc settling velocity models in freshwater, highlighting...
Short summary
Fine sediment grains in freshwater can cohere into faster-settling particles called flocs, but floc settling velocity theory has not been fully validated. Combining three data sources in novel ways in the Wax Lake Delta, we verified a semi-empirical model relying on turbulence and geochemical factors. For a physics-based model, we showed that the representative grain diameter within flocs relies on floc structure and that heterogeneous flow paths inside flocs increase floc settling velocity.
Fine sediment grains in freshwater can cohere into faster-settling particles called flocs, but...
