Articles | Volume 4, issue 1
https://doi.org/10.5194/esurf-4-193-2016
© Author(s) 2016. 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-4-193-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
03 Feb 2016
Research article |
| 03 Feb 2016
On a neck, on a spit: controls on the shape of free spits
Woods Hole Oceanographic Institution, Geology and
Geophysics Department, Woods Hole, Massachusetts, USA
J. Nienhuis
Woods Hole Oceanographic Institution, Geology and
Geophysics Department, Woods Hole, Massachusetts, USA
Massachusetts Institute of Technology, Earth,
Atmospheric, and Planetary Sciences, Cambridge, Massachusetts,
USA
K. Ells
University of North Carolina Wilmington, Center for
Marine Science, Wilmington, North Carolina, USA
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At Sargent Beach, Texas, USA, a rapidly eroding soft-sediment cliff system, we study the planform evolution of the cliff face in response to storms and sediment cover. Through this analysis, we characterize the feedbacks between morphology and retreat rate of a cliff face. We find that after a storm event, the roughness and sinuosity of the cliff face increase, which sustains higher retreat rates for years following.
Jaap H. Nienhuis, Andrew D. Ashton, Albert J. Kettner, and Liviu Giosan
Earth Surf. Dynam., 5, 585–603, https://doi.org/10.5194/esurf-5-585-2017, https://doi.org/10.5194/esurf-5-585-2017, 2017
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The Ebro Delta in Spain has a distinctive coastline shape, the origin of which has been debated. Here we show with two simple models, one of the Ebro River and one of its delta, that is it possible to reproduce this distinctive shape under constant sediment supply, wave climate, and sea-level conditions. We also find that the majority of the delta grew in the last 2000 years, when a great increase in sediment supply from the Ebro River allowed it to accelerate its growth.
Christopher W. Thomas, A. Brad Murray, Andrew D. Ashton, Martin D. Hurst, Andrew K. A. P. Barkwith, and Michael A. Ellis
Earth Surf. Dynam., 4, 871–884, https://doi.org/10.5194/esurf-4-871-2016, https://doi.org/10.5194/esurf-4-871-2016, 2016
Short summary
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Complex sandy coastlines, such as capes and spits, are important socio-economically while underpinning and protecting important natural habitats. Although they may protect inshore areas, they are inherently fragile and susceptible to erosion. We have explored how spits and capes might adapt to changing wave climate through modelling. We find that coastlines may not be in equilibrium with current conditions, and past shapes may strongly influence those adapting to new wave climates.
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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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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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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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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.
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.
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.
Jon D. Pelletier, Robert G. Hayes, Olivia Hoch, Brendan Fenerty, and Luke A. McGuire
EGUsphere, https://doi.org/10.5194/egusphere-2024-1153, https://doi.org/10.5194/egusphere-2024-1153, 2024
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On the gently sloping landscapes next to mountain fronts, junction angles tend to be lower (more acute), while in bedrock landscapes where the initial landscape or tectonic forcing is likely more spatially variable, junction angles tend to be larger (more obtuse). We demonstrate this using an analysis of ~20 million junction angles for the U.S.A., augmented by analyses of the Loess Plateau, China, and synthetic landscapes.
Alexander B. Prescott, Jon D. Pelletier, Satya Chataut, and Sriram Ananthanarayan
EGUsphere, https://doi.org/10.5194/egusphere-2024-1138, https://doi.org/10.5194/egusphere-2024-1138, 2024
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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.
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.
Aline Zinelabedin, Joel Mohren, Maria Wierzbicka-Wieczorek, Tibor Janos Dunai, Stefan Heinze, and Benedikt Ritter
EGUsphere, https://doi.org/10.5194/egusphere-2024-592, https://doi.org/10.5194/egusphere-2024-592, 2024
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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.
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.
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.
Lindsay Marie Capito, Enrico Pandrin, Walter Bertoldi, Nicola Surian, and Simone Bizzi
Earth Surf. Dynam., 12, 321–345, https://doi.org/10.5194/esurf-12-321-2024, https://doi.org/10.5194/esurf-12-321-2024, 2024
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We propose that the pattern of erosion and deposition from repeat topographic surveys can be a proxy for path length in gravel-bed rivers. With laboratory and field data, we applied tools from signal processing to quantify this periodicity and used these path length estimates to calculate sediment transport using the morphological method. Our results highlight the potential to expand the use of the morphological method using only remotely sensed data as well as its limitations.
Xuxu Wu, Jonathan Malarkey, Roberto Fernández, Jaco H. Baas, Ellen Pollard, and Daniel R. Parsons
Earth Surf. Dynam., 12, 231–247, https://doi.org/10.5194/esurf-12-231-2024, https://doi.org/10.5194/esurf-12-231-2024, 2024
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The seabed changes from flat to rippled in response to the frictional influence of waves and currents. This experimental study has shown that the speed of this change, the size of ripples that result and even whether ripples appear also depend on the amount of sticky mud present. This new classification on the basis of initial mud content should lead to improvements in models of seabed change in present environments by engineers and the interpretation of past environments by geologists.
Andrea D'Alpaos, Davide Tognin, Laura Tommasini, Luigi D'Alpaos, Andrea Rinaldo, and Luca Carniello
Earth Surf. Dynam., 12, 181–199, https://doi.org/10.5194/esurf-12-181-2024, https://doi.org/10.5194/esurf-12-181-2024, 2024
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Sediment erosion induced by wind waves is one of the main drivers of the morphological evolution of shallow tidal environments. However, a reliable description of erosion events for the long-term morphodynamic modelling of tidal systems is still lacking. By statistically characterizing sediment erosion dynamics in the Venice Lagoon over the last 4 centuries, we set up a novel framework for a synthetic, yet reliable, description of erosion events in tidal systems.
Davide Tognin, Andrea D'Alpaos, Luigi D'Alpaos, Andrea Rinaldo, and Luca Carniello
Earth Surf. Dynam., 12, 201–218, https://doi.org/10.5194/esurf-12-201-2024, https://doi.org/10.5194/esurf-12-201-2024, 2024
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Reliable quantification of sediment transport processes is necessary to understand the fate of shallow tidal environments. Here we present a framework for the description of suspended sediment dynamics to quantify deposition in the long-term modelling of shallow tidal systems. This characterization, together with that of erosion events, allows one to set up synthetic, yet reliable, models for the long-term evolution of tidal landscapes.
Emma L. S. Graf, Hugh D. Sinclair, Mikaël Attal, Boris Gailleton, Basanta Raj Adhikari, and Bishnu Raj Baral
Earth Surf. Dynam., 12, 135–161, https://doi.org/10.5194/esurf-12-135-2024, https://doi.org/10.5194/esurf-12-135-2024, 2024
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Using satellite images, we show that, unlike other examples of earthquake-affected rivers, the rivers of central Nepal experienced little increase in sedimentation following the 2015 Gorkha earthquake. Instead, a catastrophic flood occurred in 2021 that buried towns and agricultural land under up to 10 m of sediment. We show that intense storms remobilised glacial sediment from high elevations causing much a greater impact than flushing of earthquake-induced landslides.
Cited articles
Allard, J., Bertin, X., Chaumillon, E., and Pouget, F.: Sand spit rhythmic
development: A potential record of wave climate variations? Arçay Spit,
western coast of France, Mar. Geol., 253, 107–131,
https://doi.org/10.1016/j.margeo.2008.05.009, 2008.
Ashton, A. D. and Giosan, L.: Wave-angle control of delta evolution,
Geophys. Res. Lett., 38, L13405, https://doi.org/10.1029/2011gl047630, 2011.
Ashton, A. D. and Murray, A. B.: High-angle wave instability and emergent
shoreline shapes: 1. Modeling of sand waves, flying spits, and capes, J.
Geophys. Res. Surf., 111, 1–2, https://doi.org/10.1029/2005JF000422, 2006a.
Ashton, A. D. and Murray, A. B.: High-angle wave instability and emergent
shoreline shapes: 2. Wave climate analysis and comparisons to nature, J.
Geophys. Res. Surf., 111, F04012, https://doi.org/10.1029/2005JF000423, 2006b.
Ashton, A. D., Murray, A. B., and Littlewood, R.: The response of spit shapes
to wave-angle climates, in: Coastal Sediments '07, vol. 1, edited by:
Kraus, N. C. and Rosati, J. D., 351–363, ASCE, New Orleans, LA., 2007.
Ashton, A. D., Murray, A. B., Littlewood, R., Lewis, D. A., and Hong, P.:
Fetch-limited self-organization of elongate water bodies, Geology, 37,
187–190, https://doi.org/10.1130/g25299a.1, 2009.
Ashton, A., Murray, A. B., and Arnoult, O.: Formation of coastline features
by large-scale instabilities induced by high-angle waves, Nature, 414,
296–300, https://doi.org/10.1038/35104541, 2001.
Bolaños, R., Jorda, G., Cateura, J., Lopez, J., Puigdefabregas, J.,
Gomez, J., and Espino, M.: The XIOM: 20 years of a regional coastal
observatory in the Spanish Catalan coast, J. Mar. Syst., 77, 237–260,
https://doi.org/10.1016/j.jmarsys.2007.12.018, 2009.
Bruun, P.: Forms of equilibrium of coasts with a littoral drift, in Coastal
Stability, 5–22, Atelier Electra, Copenhagen, 1954.
Bruun, P.: Sea-level rise as a cause of shore erosion, Proc. ASCE, J.
Waterw. Harb. Div., 88, 117–130, 1962.
Chawla, A., Spindler, D. M., and Tolman, H. L.: Validation of a thirty year
wave hindcast using the Climate Forecast System Reanalysis winds, Ocean
Model., 70, 189–206, https://doi.org/10.1016/j.ocemod.2012.07.005, 2013.
Davidson-Arnott, R. G. D., and Van Heyningen, A. G.: Migration and
sedimentology of longshore sandwaves, Long Point, Lake Erie, Canada,
Sedimentology, 50, 1123–1137, 2003.
Davis, W. M.: The outline of Cape Cod, Proc. Am. Acad. Arts Sci., 31,
303–332, 1896.
Evans, O. F.: Mass transportation of sediments on subaqueous terraces, J.
Geol., 47, 325–334, 1939.
Falqués, A. and Calvete, D.: Large-scale dynamics of sandy coastlines:
Diffusivity and instability, J. Geophys. Res., 110, C0300,
https://doi.org/10.1029/2004JC002587, 2005.
Falqués, A., Calvete, D., and Ribas, F.: Shoreline Instability due to
Very Oblique Wave Incidence: Some Remarks on the Physics, J. Coast. Res.,
291–295, https://doi.org/10.2112/jcoastres-d-09-00095.1, 2011.
Gilbert, G. K.: The topographic features of lake shores, United States Geol.
Surv. Annu. Rep., 5, 69–123, 1885.
Giosan, L., Donnelly, J. P., Vespremeanu, E., Bhattacharya, J., Olariu, C., and Buonaiuto, F. S.: River delta morphodynamics: Examples from the Danube
delta, in River Deltas: Concepts, Models, and Examples, SEPM Special
Publication 83, edited by: Giosan, L. and Bhattacharya, J., 393–412,
2005.
Gulliver, F.: Shoreline topography, Proc. Am. Acad. Arts Sci., 34,
151–258, 1899.
Hallermeier, R. J.: A profile zonation for seasonal sand beaches from wave
climate, Coast. Eng., 4, 253–277, 1981.
Hequette, A. and Ruz, M. H.: Spit and Barrier-Island Migration in the
Southeastern Canadian Beaufort Sea, J. Coast. Res., 7, 677–698, 1991.
Hoan, L. X., Hanson, H., Larson, M., and Kato, S.: A mathematical model of
spit growth and barrier elongation: Application to Fire Island Inlet (USA)
and Badreveln Spit (Sweden), Estuar. Coast. Shelf Sci., 93, 468–477,
https://doi.org/10.1016/j.ecss.2011.05.033, 2011.
Inman, D. L.: Littoral cells, in Encyclopedia of Coastal Science, edited by: Schwartz, M., 594–599, Springer, Dondrecht, 2005.
Jewell, P. W.: Morphology and paleoclimatic significance of Pleistocene Lake
Bonneville spits, Quat. Res., 68, 421–430,
https://doi.org/10.1016/j.yqres.2007.07.004, 2007.
Jiménez, J. A. and Sánchez-Arcilla, A.: A long-term (decadal scale)
evolution model for microtidal barrier systems, Coast. Eng., 51,
749–764, 2004.
Johnson, D.: Shore processes and shoreline development, John Wiley &
Sons, Inc., London, 584 pp., 1919.
Kaergaard, K. and Fredsoe, J.: A numerical shoreline model for shorelines
with large curvature, Coast. Eng., 74, 19–32,
https://doi.org/10.1016/j.coastaleng.2012.11.011, 2013a.
Kaergaard, K. and Fredsoe, J.: Numerical modeling of shoreline undulations
part 1: Constant wave climate, Coast. Eng., 75, 64–76,
https://doi.org/10.1016/j.coastaleng.2012.11.006, 2013b.
Kaergaard, K. and Fredsoe, J.: Numerical modeling of shoreline undulations
part 2: Varying wave climate and comparison with observations, Coast. Eng.,
75, 77–90, https://doi.org/10.1016/j.coastaleng.2012.11.003, 2013c.
King, C. A. M. and Mc Cullagh, M. J.: A simulation model of a complex
recurved spit, J. Geol., 79, 22–37, 1971.
Komar, P. D.: The mechanics of sand transport on beaches, J. Geophys. Res.,
76, 713–721, 1971.
Komar, P. D.: Computer models of delta growth due to sediment input from
rivers and longshore transport, Geol. Soc. Am. Bull., 84, 2217–2226, 1973.
Komar, P. D.: Beach Processes and Sedimentation, Second Edi., Simon &
Schuster, Upper Saddle River, New Jersey, 544 pp., 1998.
Kraus, N. C.: Analytical model of spit evolution at inlets, in Coastal
Sediments '99, 1739–1754, ASCE, Long Island, 1999.
Larson, M., Hanson, H., and Kraus, N. C.: Analytical solutions of the
one-line model of shoreline change, Technical Report CERC-87-15, 1987.
Leatherman, S. P.: Migration of Assateague Island, Maryland, by inlet and
overwash processes, Geology, 7, 104–107, 1979.
Leatherman, S. P.: Barrier dynamics and landward migration with Holocene
sea-level rise, Nature, 301, 415–417, 1983.
Limber, P. W. and Murray, A. B.: Beach and sea-cliff dynamics as a driver of
long-term rocky coastline evolution and stability, Geology, 39,
1147–1150, https://doi.org/10.1130/g32315.1, 2011.
Lindhorst, S., Fürstenau, J., Hass, H. C. and Betzker, C.: Anatomy and sedimentary model
of a hooked spit (Sylt, southern North Sea), Sedimentology, 57, 935–955, https://doi.org/10.1111/j.1365-3091.2009.01126.x, 2010.
López-Ruiz, A., Ortega-Sánchez, M., Baquerizo, A., and Losada, M. A.:
Short and medium-term evolution of shoreline undulations on curvilinear
coasts, Geomorphology, 159–160, 189–200,
https://doi.org/10.1016/j.geomorph.2012.03.026, 2012.
López-Ruiz, A., Ortega-Sánchez, M., Baquerizo, A., and Losada, M.
Á.: A note on alongshore sediment transport on weakly curvilinear coasts
and its implications, Coast. Eng., 88, 143–153,
https://doi.org/10.1016/j.coastaleng.2014.03.001, 2014.
Lorenzo-Trueba, J. and Ashton, A. D.: Rollover, drowning, and discontinuous
retreat: Distinct modes of barrier response to sea-level rise arising from a
simple morphodynamic model, J. Geophys. Res. Earth Surf., 119, 779–801,
https://doi.org/10.1002/2013JF002941, 2014.
Medellín, G., Medina, R., Falqués, a., and González, M.:
Coastline sand waves on a low-energy beach at “El Puntal” spit, Spain,
Mar. Geol., 250, 143–156, https://doi.org/10.1016/j.margeo.2007.11.011, 2008.
Murray, A. B.: Contrasting the goals, strategies, and predictions associated
with simplified numerical models and detailed simulations, in: Prediction in
Geomorphology, AGU Geophysical Monograph 135, edited by: Iverson, R. M. and
Wilcock, P. R., 151–165, Washington, DC, 2003.
Murray, A. B.: Reducing model complexity for explanation and prediction,
Geomorphology, 90, 178–191, https://doi.org/10.1016/j.geomorph.2006.10.020, 2007.
Murray, A. B. and Ashton, A. D.: Instability and finite-amplitude
self-organization of large-scale coastline shapes, Philos. Trans. R. Soc. A
Math. Physical Eng. Sci., 371, 20120363, https://doi.org/10.1098/rsta.2012.0363, 2013.
Nienhuis, J. H., Ashton, A. D., Roos, P. C., Hulscher, S. J. M. H., and
Giosan, L.: Wave reworking of abandoned deltas, Geophys. Res. Lett., 40,
5899–5903, https://doi.org/10.1002/2013GL058231, 2013.
Pelnard-Consideré, R.: Essai de theorie de l'evolution des formes de
rivage en plages de sable et de galets, 4th Journees l'Hydraulique, Les
Energies la Mer, III, 289–298, 1956.
Pelnard-Consideré, R.: L'Hydraulique et la maîtrise du littoral: Les prévisions de
l'évolution d'une plage (complément des anciennes équations proposées pour l'étude de ce
problème), XVIII Journées de L'Hydraulique, Question No II (Rapport No. 7), 1984.
Petersen, D., Deigaard, R., and Fredsoe, J.: Modelling the morphology of
sandy spits, Coast. Eng., 55, 671–684,
https://doi.org/10.1016/j.coastaleng.2007.11.009, 2008.
Raynal, O., Bouchette, F., Certain, R., Séranne, M., Dezileau, L.,
Sabatier, P., Lofi, J., Hy, A. B. X., Briqueu, L., and Pezard, P.: Control of
alongshore-oriented sand spits on the dynamics of a wave-dominated coastal
system (Holocene deposits, northern Gulf of Lions, France), Mar. Geol.,
264, 242–257, https://doi.org/10.1016/j.margeo.2009.06.008, 2009.
Roy, P. S., Cowell, P. J., Ferland, M. A., and Thom, B. G.: Wave-dominated
Coasts, in: Coastal Evolution: Late Quaternary shoreline morphodynamics,
edited by: Carter, R. W. G. and Woodroffe, C. D., 121–186, University
Press, Cambridge, 1994.
Sanchez-Arcilla, A., Jiménez, J. A., and Valdemoro, H. I.: The Ebro
Delta: Morphodynamics and Vulnerability, J. Coast. Res., 14, 754–772,
1998.
Schwartz, M. L.: Spits and Bars, Dowden, Hutchinson & Ross, Inc.,
Stroudsburg, 452 pp., 1972.
Swift, D. J. P., Niederoda, A. W., Vincent, C. E., and Hopkins, T. S.:
Barrier island evolution, middle Atlantic shelf, U.S.A. Part I: Shoreface
dynamics, Mar. Geol., 63, 331–361, https://doi.org/10.1016/0025-3227(85)90089-1,
1985.
Valvo, L. M., Murray, A. B., and Ashton, A. D.: How does underlying geology
affect coastline change? An initial modeling investigation, J. Geophys. Res.
Surf., 111, F02025, https://doi.org/10.1029/2005JF000340, 2006.
van den Berg, N., Falqués, A., and Ribas, F.: Long-term evolution of
nourished beaches under high angle wave conditions, J. Mar. Syst., 88,
102–112, https://doi.org/10.1016/j.jmarsys.2011.02.018, 2011.
van den Berg, N., Falqués, A., and Ribas, F.: Modeling large scale
shoreline sand waves under oblique wave incidence, J. Geophys. Res.,
117, F03019, https://doi.org/10.1029/2011jf002177, 2012.
Zenkovich, V. P.: Processes of coastal development, edited by: Steers, J.
A., Oliver & Boyd, Edinburgh, London, 738 pp., 1967.
Short summary
Depositional shoreline spits are found along many of the Earth's modern and paleo-shorelines. Here we use a numerical model of shoreline evolution to develop a comprehensive model of the controls on spit shape, demonstrating that spits are graded shapes that arise from feedbacks between the headland, neck, and hook through the migration of a "fulcrum point". Our results suggest that spit form is controlled not only by the directional wave climate but also by the rate of headland recession.
Depositional shoreline spits are found along many of the Earth's modern and paleo-shorelines....
