Articles | Volume 5, issue 3
https://doi.org/10.5194/esurf-5-399-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/esurf-5-399-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
19 Jul 2017
Research article |
| 19 Jul 2017
The influence of turbulent bursting on sediment resuspension under unidirectional currents
Sarik Salim
CORRESPONDING AUTHOR
School of Civil Environmental and Mining Engineering and UWA
Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Charitha Pattiaratchi
School of Civil Environmental and Mining Engineering and UWA
Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Rafael Tinoco
Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Giovanni Coco
Faculty of Science, University of Auckland, Auckland 1142, New Zealand
Yasha Hetzel
School of Civil Environmental and Mining Engineering and UWA
Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Sarath Wijeratne
School of Civil Environmental and Mining Engineering and UWA
Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Ravindra Jayaratne
School of Architecture, Computing and Engineering, University of East London,
Docklands Campus, 4–6 University Way, London, E16 2RD, UK
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Sharani Kodithuwakku, Charitha Pattiaratchi, Simone Cosoli, and Yasha Hetzel
EGUsphere, https://doi.org/10.5194/egusphere-2024-2901, https://doi.org/10.5194/egusphere-2024-2901, 2024
Preprint archived
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Mesoscale eddies are rotating structures in the ocean. This study investigates the surface and subsurface characteristics of mesoscale eddies in the vicinity of Perth submarine canyon off the southwest coast of Western Australia using Ocean Gliders. Eight Seaglider missions that intersected eddies revealed nine distinct vertical structures, comprising four cyclonic and five anti-cyclonic eddies. There was upwelling in cyclonic eddies and downwelling in anti-cyclonic eddies.
Jessica Kolbusz, Jan Zika, Charitha Pattiaratchi, and Alan Jamieson
Ocean Sci., 20, 123–140, https://doi.org/10.5194/os-20-123-2024, https://doi.org/10.5194/os-20-123-2024, 2024
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We collected observations of the ocean environment at depths over 6000 m in the Southern Ocean, Indian Ocean, and western Pacific using sensor-equipped landers. We found that trench locations impact the water characteristics over these depths. Moving northward, they generally warmed but differed due to their position along bottom water circulation paths. These insights stress the importance of further research in understanding the environment of these deep regions and their importance.
Eduardo Gomez-de la Peña, Giovanni Coco, Colin Whittaker, and Jennifer Montaño
Earth Surf. Dynam., 11, 1145–1160, https://doi.org/10.5194/esurf-11-1145-2023, https://doi.org/10.5194/esurf-11-1145-2023, 2023
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Predicting how shorelines change over time is a major challenge in coastal research. We here have turned to deep learning (DL), a data-driven modelling approach, to predict the movement of shorelines using observations from a camera system in New Zealand. The DL models here implemented succeeded in capturing the variability and distribution of the observed shoreline data. Overall, these findings indicate that DL has the potential to enhance the accuracy of current shoreline change predictions.
Wagner L. L. Costa, Karin R. Bryan, and Giovanni Coco
Nat. Hazards Earth Syst. Sci., 23, 3125–3146, https://doi.org/10.5194/nhess-23-3125-2023, https://doi.org/10.5194/nhess-23-3125-2023, 2023
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For predicting flooding events at the coast, topo-bathymetric data are essential. However, elevation data can be unavailable. To tackle this issue, recent efforts have centred on the use of satellite-derived topography (SDT) and bathymetry (SDB). This work is aimed at evaluating their accuracy and use for flooding prediction in enclosed estuaries. Results show that the use of SDT and SDB in numerical modelling can produce similar predictions when compared to the surveyed elevation data.
Charline Dalinghaus, Giovanni Coco, and Pablo Higuera
Nat. Hazards Earth Syst. Sci., 23, 2157–2169, https://doi.org/10.5194/nhess-23-2157-2023, https://doi.org/10.5194/nhess-23-2157-2023, 2023
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Wave setup is a critical component of coastal flooding. Consequently, understanding and being able to predict wave setup is vital to protect coastal resources and the population living near the shore. Here, we applied machine learning to improve the accuracy of present predictors of wave setup. The results show that the new predictors outperform existing formulas demonstrating the capability of machine learning models to provide a physically sound description of wave setup.
Jessica Kolbusz, Tim Langlois, Charitha Pattiaratchi, and Simon de Lestang
Biogeosciences, 19, 517–539, https://doi.org/10.5194/bg-19-517-2022, https://doi.org/10.5194/bg-19-517-2022, 2022
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Western rock lobster larvae spend up to 11 months in offshore waters before ocean currents and their ability to swim transport them back to the coast. In 2008, there was a reduction in the number of puerulus (larvae) settling into the fishery. We use an oceanographic model to see how the environment may have contributed to the reduction. Our results show that a combination of effects from local currents and a widespread quiet period in the ocean off WA likely led to less puerulus settlement.
Yizhang Wei, Yining Chen, Jufei Qiu, Zeng Zhou, Peng Yao, Qin Jiang, Zheng Gong, Giovanni Coco, Ian Townend, and Changkuan Zhang
Earth Surf. Dynam., 10, 65–80, https://doi.org/10.5194/esurf-10-65-2022, https://doi.org/10.5194/esurf-10-65-2022, 2022
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The barrier tidal basin is increasingly altered by human activity and sea-level rise. These environmental changes probably lead to the emergence or disappearance of islands, yet the effect of rocky islands on the evolution of tidal basins remains poorly investigated. Using numerical experiments, we explore the evolution of tidal basins under varying numbers and locations of islands. This work provides insights for predicting the response of barrier tidal basins in a changing environment.
Charitha Pattiaratchi, Mirjam van der Mheen, Cathleen Schlundt, Bhavani E. Narayanaswamy, Appalanaidu Sura, Sara Hajbane, Rachel White, Nimit Kumar, Michelle Fernandes, and Sarath Wijeratne
Ocean Sci., 18, 1–28, https://doi.org/10.5194/os-18-1-2022, https://doi.org/10.5194/os-18-1-2022, 2022
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The Indian Ocean receives a large proportion of plastics, but very few studies have addressed the sources, transport pathways, and sinks. There is a scarcity of observational data for the Indian Ocean. Most plastic sources are derived from rivers, although the amount derived from fishing activity (ghost nets, discarded ropes) is unknown. The unique topographic features of the Indian Ocean that create the monsoons and reversing currents have a large influence on the transport and sinks.
Mirjam van der Mheen, Erik van Sebille, and Charitha Pattiaratchi
Ocean Sci., 16, 1317–1336, https://doi.org/10.5194/os-16-1317-2020, https://doi.org/10.5194/os-16-1317-2020, 2020
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A large percentage of global ocean plastic enters the Indian Ocean through rivers, but the fate of these plastics is generally unknown. In this paper, we use computer simulations to show that floating plastics
beachand end up on coastlines throughout the Indian Ocean. Coastlines where a lot of plastic enters the ocean are heavily affected by beaching plastic, but plastics can also beach far from the source on remote islands and countries that contribute little plastic pollution of their own.
Giovanni Coco, Daniel Calvete, Francesca Ribas, Huib E. de Swart, and Albert Falqués
Earth Surf. Dynam., 8, 323–334, https://doi.org/10.5194/esurf-8-323-2020, https://doi.org/10.5194/esurf-8-323-2020, 2020
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Sandbars are ubiquitous features of the surf zone. They are rarely straight and often develop crescentic shapes. Double sandbar systems are also common, but the possibility of feedback between inner and outer sandbars has not been fully explored. The presence of double sandbar systems affects wave transformation and can result in a variety of spatial patterns. Here we model the conditions, waves and initial bathymetry that lead to the emergence of different patterns.
Miaoju Chen, Charitha B. Pattiaratchi, Anas Ghadouani, and Christine Hanson
Ocean Sci., 15, 333–348, https://doi.org/10.5194/os-15-333-2019, https://doi.org/10.5194/os-15-333-2019, 2019
Julie A. Trotter, Charitha Pattiaratchi, Paolo Montagna, Marco Taviani, James Falter, Ron Thresher, Andrew Hosie, David Haig, Federica Foglini, Quan Hua, and Malcolm T. McCulloch
Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-319, https://doi.org/10.5194/bg-2018-319, 2018
Manuscript not accepted for further review
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The first ROV exploration of the Perth Canyon offshore southwest Australia discovered diverse
hot spotsof deep-sea biota to depths of ~ 2000 m. Some corals were living below the carbonate saturation horizon. Extensive coral graveyards found at ~ 700 and ~ 1700 m are between ~ 18 000 and ~ 30 000 years old, indicating these corals flourished during the last ice age. Anthropogenic carbon detected within the upper ~ 800 m highlights the increasing threat of climate change to deep-sea ecosystems.
Marinella Passarella, Evan B. Goldstein, Sandro De Muro, and Giovanni Coco
Nat. Hazards Earth Syst. Sci., 18, 599–611, https://doi.org/10.5194/nhess-18-599-2018, https://doi.org/10.5194/nhess-18-599-2018, 2018
Peter R. Oke, Roger Proctor, Uwe Rosebrock, Richard Brinkman, Madeleine L. Cahill, Ian Coghlan, Prasanth Divakaran, Justin Freeman, Charitha Pattiaratchi, Moninya Roughan, Paul A. Sandery, Amandine Schaeffer, and Sarath Wijeratne
Geosci. Model Dev., 9, 3297–3307, https://doi.org/10.5194/gmd-9-3297-2016, https://doi.org/10.5194/gmd-9-3297-2016, 2016
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The Marine Virtual Laboratory (MARVL) is designed to help ocean modellers hit the ground running. Usually, setting up an ocean model involves a handful of technical steps that time and effort. MARVL provides a user-friendly interface that allows users to choose what options they want for their model, including the region, time period, and input data sets. The user then hits "go", and MARVL does the rest – delivering a "take-away bundle" that contains all the files needed to run the model.
J. Reisser, B. Slat, K. Noble, K. du Plessis, M. Epp, M. Proietti, J. de Sonneville, T. Becker, and C. Pattiaratchi
Biogeosciences, 12, 1249–1256, https://doi.org/10.5194/bg-12-1249-2015, https://doi.org/10.5194/bg-12-1249-2015, 2015
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Subsurface observations of ocean plastics are very scarce but essential for adequate estimates of marine plastic pollution levels. We sampled plastics from the sea surface to a depth of 5m, at 0.5m intervals. Vertical mixing was dependent on sea state and affected the abundance, mass, and sizes of plastic debris floating at the sea surface. This has important implications for studies assessing at-sea plastic load, size distribution, drifting pattern, and impact on marine species and habitats.
A. de Vos, C. B. Pattiaratchi, and E. M. S. Wijeratne
Biogeosciences, 11, 5909–5930, https://doi.org/10.5194/bg-11-5909-2014, https://doi.org/10.5194/bg-11-5909-2014, 2014
S. R. Kularatne, J. Doucette, and C. B. Pattiaratchi
Earth Surf. Dynam. Discuss., https://doi.org/10.5194/esurfd-2-215-2014, https://doi.org/10.5194/esurfd-2-215-2014, 2014
Revised manuscript has not been submitted
M. Jiménez, S. Castanedo, Z. Zhou, G. Coco, R. Medina, and I. Rodriguez-Iturbe
Adv. Geosci., 39, 69–73, https://doi.org/10.5194/adgeo-39-69-2014, https://doi.org/10.5194/adgeo-39-69-2014, 2014
Z. Zhou, L. Stefanon, M. Olabarrieta, A. D'Alpaos, L. Carniello, and G. Coco
Earth Surf. Dynam., 2, 105–116, https://doi.org/10.5194/esurf-2-105-2014, https://doi.org/10.5194/esurf-2-105-2014, 2014
R. O. Tinoco and G. Coco
Earth Surf. Dynam., 2, 83–96, https://doi.org/10.5194/esurf-2-83-2014, https://doi.org/10.5194/esurf-2-83-2014, 2014
E. B. Goldstein, G. Coco, A. B. Murray, and M. O. Green
Earth Surf. Dynam., 2, 67–82, https://doi.org/10.5194/esurf-2-67-2014, https://doi.org/10.5194/esurf-2-67-2014, 2014
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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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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.
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.
Justin A. Nghiem, Gen K. Li, Joshua P. Harringmeyer, Gerard Salter, Cédric G. Fichot, Luca Cortese, and Michael P. Lamb
Earth Surf. Dynam., 12, 1267–1294, https://doi.org/10.5194/esurf-12-1267-2024, https://doi.org/10.5194/esurf-12-1267-2024, 2024
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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.
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.
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.
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.
Cited articles
Aagaard, T. and Jensen, S. G.: Sediment concentration and vertical mixing under breaking waves, Mar. Geol., 336, 146–159, https://doi.org/10.1016/j.margeo.2012.11.015, 2013.
Adrian, R. J.: Hairpin vortex organization in wall turbulence, Phys. Fluids, 19, 041301, https://doi.org/10.1063/1.2717527, 2007.
Bagnold, R. A.: The flow of cohesionless grains in fluids, Philos. Tr. R. Soc. S.-A, 249, 235–297, 1956.
Best, J. I. M.: On the entrainment of sediment and initiation of bed defects: insights from recent developments within turbulent boundary layer research, Sedimentology, 39, 797–811, 1992.
Biron, P. M., Robson, C., Lapointe, M. F., and Gaskin, S. J.: Comparing different methods of bed shear stress estimates in simple and complex flow fields, Earth Surf. Proc. Land., 29, 1403–1415, https://doi.org/10.1002/esp.1111, 2004.
Brownlie, W. R.: Prediction of flow depth and sediment discharge in open channels, PhD Thesis, Engineering and Applied Science, California Institute of Technology, California, 1981.
Buffington, J. M.: The legend of A. F. Shields, J. Hydraul. Eng., 125, 376–387, https://doi.org/10.1061/(ASCE)0733-9429(1999)125:4(376), 1999.
Buffington, J. M. and Montgomery, D. R.: A systematic analysis of eight decades of incipient motion studies, with special reference to gravel-bedded rivers, Water Resour. Res., 33, 1993–2029, 1997.
Cao, Z.: Turbulent bursting-based sediment entrainment function, J. Hydraul. Eng., 123, 233–236, 1997.
Cao, Z., Xi, H., and Zhang, X.: Turbulent bursting-based diffusion model for suspended sediment in open channel flows, J. Hydraul. Res., 34, 457–472, https://doi.org/10.1080/00221689609498471, 1996.
Cellino, M. and Lemmin, U.: Influence of coherent flow structures on the dynamics of suspended sediment transport in open-channel flow, J. Hydraul. Eng., 130, 1077–1088, https://doi.org/10.1061/(ASCE)0733-9429(2004)130:11(1077), 2004.
Dey, S.: Entrainment threshold of loose boundary streams, in: Experimental Methods in Hydraulic Research, edited by: Rowinski, P., Springer, Berlin, Heidelberg, 29–48, 2011.
Dey, S. and Papanicolaou, A.: Sediment threshold under stream flow: a state-of-the-art review, KSCE J. Civ. Eng., 12, 45–60, 2008.
Dietrich, W. E.: Settling velocity of natural particles, Water Resour. Res., 18, 1615–1626, 1982.
Diplas, P. and Dancey, C. L.: Coherent Flow Structures, Initiation of Motion, Sediment Transport and Morphological Feedbacks in Rivers. Coherent Flow Structures at Earth's Surface, John Wiley and Sons, Ltd., 2013.
Diplas, P., Dancey, C. L., Celik, A. O., Valyrakis, M., Greer, K., and Akar, T.: The role of impulse on the under turbulent flow conditions, Science, 322, 717–720, 2008.
Drake, T. G., Shreve, R. L., Dietrich, W. E., Whiting, P. J., and Leopold, L. B.: Bedload transport of fine gravel observed by motion-picture photography, J. Fluid Mech., 192, 193–217, https://doi.org/10.1017/S0022112088001831, 1988.
Driver, D. M., Seegmiller, H. L., and Marvin, J. G.: Timedependent behavior of a reattachment shear layer, Am. Inst. Aeronaut. Astronaut. J., 25, 914–919, 1987.
Dwivedi, A., Melville, B. W., Shamseldin, A. Y., and Guha, T. K.: Analysis of hydrodynamic lift on a bed sediment particle, J. Geophys. Res., 116, F02015, https://doi.org/10.1029/2009JF001584, 2011.
Dyer, K. R., Soulsby, R. L.: Sand transport on the continental shelf, Annu. Rev. Fluid Mech., 20, 295–324, 1988.
Einstein, H. A.: The bed-load function for sediment transportation in open channel flows. US Department of Agriculture, Washington DC, Technical Bulletin Number 1026, 1950.
Falco, R. E.: A coherent structure model of the turbulent boundary layer and its ability to predict Reynolds number dependence, Philos. Tr. R. Soc. A, 336, 103–129, 1991.
Farge, M.: Wavelet transforms and their applications to turbulence, Annu. Rev. Fluid Mech., 24, 395–458, https://doi.org/10.1146/annurev.fl.24.010192.002143, 1992.
Fox, R. W., McDonald, A. T., and Pritchard, P. J.: Introduction to Fluid Mechanics, 6th Edn., Wiley and Sons, USA, 2004.
Fugate, D. C. and Friedrichs, C. T.: Determining concentration and fall velocity of estuarine particle populations using ADV, OBS and LISST, Cont. Shelf Res., 22, 1867–1886, https://doi.org/10.1016/S0278-4343(02)00043-2, 2002.
Grass, A. J.: Transport of fine sand on a flat bed: turbulence and suspension mechanics, in: Transport, Erosion and Deposition of Sediment in Turbulent Streams, Institute of Hydrodynamic and Hydraulic Engineering, Technical University of Denmark, Lyngby, Denmark, Proc. Euromech 48, 33–34, 1974.
Grass, A. J.: Initial instability of fine bed sand, J. Hydr. Eng. Div.-ASCE, 96, 619–632, 1970.
Grinsted, A., Moore, J. C., and Jevrejeva, S.: Application of the cross wavelet transform and wavelet coherence to geophysical time series, Nonlin. Processes Geophys., 11, 561–566, https://doi.org/10.5194/npg-11-561-2004, 2004.
Heathershaw, A. D. and Thorne, P. D.: Seabed noises reveal role of turbulent bursting phenomenon in sediment transport by tidal currents, Nature, 316, 339–342, 1985.
Heathershaw, A. D.: The turbulent structure of the bottom boundary layer in a tidal current, Geophys. J. Roy. Astr. S., 58, 395–430, 1979.
Hurther, D. and Lemmin, U.: Turbulent particle flux and momentum flux statistics in suspension flow, Water Resour. Res., 39, 1139, https://doi.org/10.1029/2001WR001113, 2003.
Kaftori, D., Hetsroni, G., and Banerjee, S.: Particle behavior in the turbulent boundary layer. I. Motion, deposition, and entrainment, Phys. Fluids, 7, 1095–1106, https://doi.org/10.1063/1.868551, 1995.
Kennedy, J. F.: The Albert Shields story, J. Hydraul. Eng., 121, 766–772, https://doi.org/10.1061/(ASCE)0733-9429(1995)121:11(766), 1995.
Keylock, C. J.: The visualisation of turbulence data using a wavelet-based method, Earth Surf. Proc. Land., 32, 637–647, 2007.
Keylock, C. J., Lane, S. N., and Richards, K. S.: Quadrant/octant sequencing and the role of coherent structures in bed load sediment entrainment, J. Geophys. Res.-Earth, 119, 264–286, 2014.
Kim, S., Friedrichs, C., Maa, J., and Wright, L.: Estimating bottom stress in tidal boundary layer from acoustic Doppler velocimeter data, J. Hydraul. Eng., 126, 399–406, https://doi.org/10.1061/(ASCE)0733-9429(2000)126:6(399), 2000.
Kline, S. J., Reynolds, W. C., Schraub, F. A., and Runstadler, P. W.: The structure of turbulent boundary layers, J. Fluid Mech., 30, 741–773, https://doi.org/10.1017/S0022112067001740, 1967.
Kularatne, S. and Pattiaratchi, C.: Turbulent kinetic energy and sediment resuspension due to wave groups, Cont. Shelf Res., 28, 726–736, https://doi.org/10.1016/j.csr.2007.12.007, 2008.
Laursen, E., Papanicolaou, A., Cheng, N., and Chiew, Y.: Discussions and closure: pickup probability for sediment entrainment, J. Hydraul. Eng., 125, 786–789, https://doi.org/10.1061/(ASCE)0733-9429(1999)125:7(789.x), 1999.
Lavelle, J. and Mofjeld, H.: Do critical stresses for incipient motion and erosion really exist?, J. Hydraul. Eng., 113, 370–385, https://doi.org/10.1061/(ASCE)0733-9429(1987)113:3(370), 1987.
Ling, C. H.: Criteria for incipient motion of spherical sediment particles, J. Hydraul. Eng., 121, 472–478, 1995.
Lohrmann, A.: Monitoring Sediment Concentration with Acoustic Backscattering Instruments, Nortek Technical Note No. 003, 1–5, 2001.
Lu, S. S. and Willmarth, W. W.: Measurements of the structure of the Reynolds stress in a turbulent boundary layer, J. Fluid Mech., 60, 481–511, https://doi.org/10.1017/S0022112073000315, 1973.
Mathis, R., Marusic, I., Chernyshenko, S. I., and Hutchins, N.: Estimating wall-shear-stress fluctuations given an outer region input, J. Fluid Mech, 715, 163–180, https://doi.org/10.1017/jfm.2012.508, 2013.
Mathis, R., Marusic, I., Cabrit, O., Jones, N. L., and Ivey, G. N.: Modeling bed shear-stress fluctuations in a shallow tidal channel, J. Geophys. Res.-Oceans, 119, 3185–3199, https://doi.org/10.1002/2013JC009718, 2014.
Miller, M. C., McCave, I. N., and Komar, P. D.: Threshold of sediment motion under unidirectional currents, Sedimentology, 24, 507–527, https://doi.org/10.1111/j.1365-3091.1977.tb00136.x, 1977.
Nelson, J. M., Shreve, R. L., McLean, S. R., and Drake, T. G.: Role of near-bed turbulence structure in bed load transport and bed form mechanics, Water Resour. Res., 31, 2071–2086, https://doi.org/10.1029/95WR00976, 1995.
Niño, Y. and Garcia, M. H.: Experiments on particle–turbulence interactions in the near-wall region of an open channel flow: implications for sediment transport, J. Fluid Mech., 326, 285–319, https://doi.org/10.1017/S0022112096008324, 1996.
Niño, Y., Lopez, F., and Garcia, M.: Threshold for particle entrainment into suspension, Sedimentology, 50, 247–263, https://doi.org/10.1046/j.1365-3091.2003.00551.x, 2003.
Pattiaratchi, C. B. and Collins, M. B.: Sand transport under the combined influence of waves and tidal currents: an assessment of available formulae, Mar. Geol., 67, 83–100,1985.
Paintal, A. S.: Concept of critical shear stress in loose boundary open channels, J. Hydraul. Res., 9, 91–113, https://doi.org/10.1080/00221687109500339, 1971.
Paphitis, D.: Sediment movement under unidirectional flows: an assessment of empirical threshold curves, Coast. Eng., 43, 227–245, https://doi.org/10.1016/s0378-3839(01)00015-1, 2001.
Robinson, S. K.: Coherent motions in the turbulent boundary layer, Annu. Rev. Fluid Mech., 23, 601–639, 1991.
Schmeeckle, M. W.: The role of velocity, pressure, and bed stress fluctuations in bed load transport over bed forms: numerical simulation downstream of a backward-facing step, Earth Surf. Dynam., 3, 105–112, https://doi.org/10.5194/esurf-3-105-2015, 2015.
Schmeeckle, M. W. and Nelson, J. M.: Direct numerical simulation of bedload transport using a local, dynamic boundary condition, Sedimentology, 50, 279–301, 2003.
Shields, A. F.: Application of similarity principles and turbulence research to bed-load movement, Mitteilungen der Preussischen Versuchsanstalt für Wasserbau und Schiffbau, Berlin, Germany, 5–24, 1936.
Shugar, D. H., Kostaschuk, R. A. Y., Best, J. L., Parsons, D. R., Lane, S. N., Orfeo, O., and Hardy, R. J.: On the relationship between flow and suspended sediment transport over the crest of a sand dune, Río Paraná, Argentina, Sedimentology, 57, 252–272, 2010.
Simpson, R. L.: Turbulent boundary layer separation, Annu. Rev. Fluid Mech., 21, 205–234, 1989.
Soulsby, R.: Dynamics of Marine Sands, Thomas Telford Publications, 99-110, 1997.
Soulsby, R. L.: The bottom boundary layer of shelf seas, in: Physical Oceanography of Coastal and Shelf Seas, edited by: Johns, B., Elsevier Oceanography Series, Elsevier, 189–266, 1983.
Soulsby, R. L., Atkins, R., and Salkield, A. P.: Observations of the turbulent structure of a suspension of sand in a tidal current, Cont. Shelf Res., 14, 429–435, https://doi.org/10.1016/0278-4343(94)90027-2, 1994.
Soulsby, R. L., Whitehouse, R. J. S.: Threshold of sediment motion in coastal Environments, Proceedings of the Combined Australasian Coastal Engineering and Port Conference, Christchurch, 7–11 September 1997, 149–154, 1997.
Sumer, B. M. and Deigaard, R.: Particle motions near the bottom in turbulent flow in an open channel. Part 2, J. Fluid Mech., 109, 311–337, https://doi.org/10.1017/S0022112081001092, 1981.
Sumer, B. M. and Oguz, B.: Particle motions near the bottom in turbulent flow in an open channel, J. Fluid Mech., 86, 109–127, https://doi.org/10.1017/S0022112078001020, 1978.
Thompson, C. E. L., Couceiro, F., Fones, G. R., Helsby, R., Amos, C. L., Black, K., Parker, E. R., Greenwood, N., Statham, P. J., and Kelly-Gerreyn, B. A.: In situ flume measurements of resuspension in the North Sea, Estuar. Coast. Shelf S., 94, 77–88, https://doi.org/10.1016/j.ecss.2011.05.026, 2011.
Thomson, R. E. and Emery, W. J.: Chapter 6 – Digital filters, in: Data Analysis Methods in Physical Oceanography, 3rd edn., Elsevier, Boston, 593–637, 2014.
Thorne, P. D.: An overview of underwater sound generated by interparticle collisions and its application to the measurements of coarse sediment bedload transport, Earth Surf. Dynam., 2, 531–543, https://doi.org/10.5194/esurf-2-531-2014, 2014.
Thorne, P. D., Williams, J. J., and Heathershaw, A. D.: In situ acoustic measurements of marine gravel threshold and transport, Sedimentology, 36, 61–74, https://doi.org/10.1111/j.1365-3091.1989.tb00820.x, 1989.
Tinoco, R. O. and Coco, G.: Observations of the effect of emergent vegetation on sediment resuspension under unidirectional currents and waves, Earth Surf. Dynam., 2, 83–96, https://doi.org/10.5194/esurf-2-83-2014, 2014.
Tinoco, R. O. and Coco, G.: A laboratory study on sediment resuspension within arrays of rigid cylinders, Adv. Water Resour., 92, 1–9, https://doi.org/10.1016/j.advwatres.2016.04.003, 2016.
Torrence, C. and Compo, G. P.: A practical guide to wavelet analysis, B. Am. Meteorol. Soc., 79, 61–78, https://doi.org/10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2, 1998.
Valyrakis, M., Diplas, P., and Dancey, C. L.: Entrainment of coarse particles in turbulent flows: an energy approach, J. Geophys. Res.-Earth, 118, 42–53, 2013.
van Rijn, L. C., Walstra, D.-J. R., and van Ormondt, M.: Unified view of sediment transport by currents and waves. IV: Application of morphodynamic model, J. Hydraul. Eng., 133, 776–793, https://doi.org/10.1061/(ASCE)0733-9429(2007)133:7(776), 2007.
van Rijn, L. C.: Sediment transport, Part I: Bed load transport, J. Hydraul. Eng., 110, 1431–1456, https://doi.org/10.1061/(ASCE)0733-9429(1984)110:10(1431), 1984.
van Rijn, L. C.: Simple general formulae for sand transport in rivers, estuaries and coastal waters, available at: www.leovanrijnsediment.com (last access: 26 March 2017), 2013.
Velikanov, M. A.: Dynamics of Alluvial Stream, 2, State Publishing House of Theoretical and Technical Literature, Russia, 1955 [in Russian].
Venditti, J. G., Hardy, R. J., Church, M., and Best, J. L.: What is a coherent flow structure in geophysical flow?, in: Coherent Flow Structures at Earth's Surface, edited by: Venditti, J. G., Best, J. L., Church, M., and Hardy, R. J., John Wiley and Sons, Ltd, Chichester, UK, https://doi.org/10.1002/9781118527221.ch1, 2013.
Voulgaris, G. and Meyers, S. T.: Temporal variability of hydrodynamics, sediment concentration and sediment settling velocity in a tidal creek, Cont. Shelf Res., 24, 1659–1683, https://doi.org/10.1016/j.csr.2004.05.006, 2004.
Voulgaris, G. and Trowbridge, J. H.: Evaluation of the acoustic Doppler velocimeter (ADV) for turbulence measurements, J. Atmos. Ocean. Tech., 15, 272–289, https://doi.org/10.1175/1520-0426(1998)015<0272:EOTADV>2.0.CO;2, 1998.
Wallace, J. M., Eckelmann, H., and Brodkey, R. S.: The wall region in turbulent shear flow, J. Fluid Mech., 54, 39–48, https://doi.org/10.1017/S0022112072000515, 1972.
Weaver, C. M. and Wiggs, G. F. S.: Sweeping up sand: Coherent flow structures and sediment entrainment, paper presented at European Geophysical Union 2008 General Assembly, Vienna, 2008.
Willmarth, W. W. and Lu, S. S.: Structure of the Reynolds stress near the wall, J. Fluid Mech., 55, 65–92, https://doi.org/10.1017/S002211207200165X, 1972.
Wu, F. C. and Shih, W. R.: Entrainment of sediment particles by retrograde vortices: Test of hypothesis using near-particle observations, J. Geophys. Res., 117, F03018, https://doi.org/10.1029/2011JF002242, 2012.
Wu, W. and Wang, S. S. Y.: Movable bed roughness in alluvial rivers, J. Hydraul. Eng., 125, 1309–1312, https://doi.org/10.1061/(ASCE)0733-9429(1999)125:12(1309), 1999.
Yalin, M. S.: An expression of bed-load transportation, J. Hydraul. Div., 89, 221–250, 1963.
Yalin, M. S. and Karahan, E.: Inception of sediment transport, J. Hydraul. Div., 105, 1433–1443, 1979.
Yuan, Y., Wei, H., Zhao, L. A., and Cao, Y. N.: Implications of intermittent turbulent bursts for sediment resuspension in a coastal bottom boundary layer: a field study in the western Yellow Sea, China, Mar. Geol., 263, 87–96, https://doi.org/10.1016/j.margeo.2009.03.023, 2009.
Short summary
The aim of this paper was to verify the existence of a mean critical velocity concept in terms of turbulent bursting phenomena. Laboratory experiments were undertaken in a unidirectional current flume where an acoustic Doppler velocimeter was used. Results in the laboratory conditions both above and below the measured mean critical velocity highlighted the need to re-evaluate the accuracy of a single time-averaged critical velocity for the initiation of sediment entrainment.
The aim of this paper was to verify the existence of a mean critical velocity concept in terms...
