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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Jacob Hardt, Tim P. Dooley, and Michael R. Hudec
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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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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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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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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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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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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.
Cho-Hee Lee, Yeong Bae Seong, John Weber, Sangmin Ha, Dong-Eun Kim, and Byung Yong Yu
EGUsphere, https://doi.org/10.5194/egusphere-2024-198, https://doi.org/10.5194/egusphere-2024-198, 2024
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Geomorphic indices were used to understand topographic changes in response to tectonic activity. We applied indices to evaluate the relative tectonic intensity of Ulsan Fault Zone, one of the most active fault zones in Korea. We divided the UFZ into five segments based on spatial variation in intensity. We modelled the landscape evolution of study area and interpreted tectono-geomorphic history that the northern part of the UFZ experienced asymmetric uplift, while the southern part did not.
Johannes Leinauer, Michael Dietze, Sibylle Knapp, Riccardo Scandroglio, Maximilian Jokel, and Michael Krautblatter
EGUsphere, https://doi.org/10.5194/egusphere-2024-231, https://doi.org/10.5194/egusphere-2024-231, 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 four 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.
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.
Aaron T. Steelquist, Gustav B. Seixas, Mary L. Gillam, Sourav Saha, Seulgi Moon, and George E. Hilley
EGUsphere, https://doi.org/10.5194/egusphere-2024-71, https://doi.org/10.5194/egusphere-2024-71, 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 on 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.
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.
Mohamad Nasr, Adele Johannot, Thomas Geay, Sebastien Zanker, Jules Le Guern, and Alain Recking
Earth Surf. Dynam., 12, 117–134, https://doi.org/10.5194/esurf-12-117-2024, https://doi.org/10.5194/esurf-12-117-2024, 2024
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Hydrophones are used to monitor sediment transport in the river by listening to the acoustic noise generated by particle impacts on the riverbed. However, this acoustic noise is modified by the river flow and can cause misleading information about sediment transport. This article proposes a model that corrects the measured acoustic signal. Testing the model showed that the corrected signal is better correlated with bedload flux in the river.
Jessica Laible, Guillaume Dramais, Jérôme Le Coz, Blaise Calmel, Benoît Camenen, David J. Topping, William Santini, Gilles Pierrefeu, and François Lauters
EGUsphere, https://doi.org/10.5194/egusphere-2023-2348, https://doi.org/10.5194/egusphere-2023-2348, 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 and discharge measurements. The method also determines the sand flux uncertainty and can be easily applied to other sites using the available open-source code.
Byungho Kang, Rusty A. Feagin, Thomas Huff, and Orencio Durán Vinent
Earth Surf. Dynam., 12, 105–115, https://doi.org/10.5194/esurf-12-105-2024, https://doi.org/10.5194/esurf-12-105-2024, 2024
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We provide a detailed characterization of the frequency, intensity and duration of flooding events at a site along the Texas coast. Our analysis demonstrates the suitability of relatively simple wave run-up models to estimate the frequency and intensity of coastal flooding. Our results validate and expand a probabilistic model of coastal flooding driven by wave run-up that can then be used in coastal risk management in response to sea level rise.
Shunsuke Oya, Fumitoshi Imaizumi, and Shoki Takayama
Earth Surf. Dynam., 12, 67–86, https://doi.org/10.5194/esurf-12-67-2024, https://doi.org/10.5194/esurf-12-67-2024, 2024
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The monitoring of pore water pressure in fully and partly saturated debris flows was performed at Ohya landslide scar, central Japan. The pore water pressure in some partly saturated flows greatly exceeded the hydrostatic pressure. The depth gradient of the pore water pressure in the lower part of the flow was generally higher than the upper part of the flow. We conclude that excess pore water pressure is present in many debris flow surges and is an important mechanism in debris flow behavior.
Gabriele Barile, Marco Redolfi, and Marco Tubino
Earth Surf. Dynam., 12, 87–103, https://doi.org/10.5194/esurf-12-87-2024, https://doi.org/10.5194/esurf-12-87-2024, 2024
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River bifurcations often show the closure of one branch (avulsion), whose causes are still poorly understood. Our model shows that when one branch stops transporting sediments, the other considerably erodes and captures much more flow, resulting in a self-sustaining process. This phenomenon intensifies when increasing the length of the branches, eventually leading to branch closure. This work may help to understand when avulsions occur and thus to design sustainable river restoration projects.
Dieter Rickenmann
Earth Surf. Dynam., 12, 11–34, https://doi.org/10.5194/esurf-12-11-2024, https://doi.org/10.5194/esurf-12-11-2024, 2024
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Field measurements of the bedload flux with a high temporal resolution in a steep mountain stream were used to analyse the transport fluctuations as a function of the flow conditions. The disequilibrium ratio, a proxy for the solid particle concentration in the flow, was found to influence the sediment transport behaviour, and above-average disequilibrium conditions – associated with a larger sediment availability on the streambed – substantially affect subsequent transport conditions.
Byungho Kang, Rusty A. Feagin, Thomas Huff, and Orencio Durán Vinent
Earth Surf. Dynam., 12, 1–10, https://doi.org/10.5194/esurf-12-1-2024, https://doi.org/10.5194/esurf-12-1-2024, 2024
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Coastal flooding can cause significant damage to coastal ecosystems, infrastructure, and communities and is expected to increase in frequency with the acceleration of sea level rise. In order to respond to it, it is crucial to measure and model their frequency and intensity. Here, we show deep-learning techniques can be successfully used to automatically detect flooding events from complex coastal imagery, opening the way to real-time monitoring and data acquisition for model development.
Judith Y. Zomer, Bart Vermeulen, and Antonius J. F. Hoitink
Earth Surf. Dynam., 11, 1283–1298, https://doi.org/10.5194/esurf-11-1283-2023, https://doi.org/10.5194/esurf-11-1283-2023, 2023
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Secondary bedforms that are superimposed on large, primary dunes likely play a large role in fluvial systems. This study demonstrates that they can be omnipresent. Especially during peak flows, they grow large and can have steep slopes, likely affecting flood risk and sediment transport dynamics. Primary dune morphology determines whether they continuously or intermittently migrate. During discharge peaks, the secondary bedforms can become the dominant dune scale.
Matthew C. Morriss, Benjamin Lehmann, Benjamin Campforts, George Brencher, Brianna Rick, Leif S. Anderson, Alexander L. Handwerger, Irina Overeem, and Jeffrey Moore
Earth Surf. Dynam., 11, 1251–1274, https://doi.org/10.5194/esurf-11-1251-2023, https://doi.org/10.5194/esurf-11-1251-2023, 2023
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In this paper, we investigate the 28 June 2022 collapse of the Chaos Canyon landslide in Rocky Mountain National Park, Colorado, USA. We find that the landslide was moving prior to its collapse and took place at peak spring snowmelt; temperature modeling indicates the potential presence of permafrost. We hypothesize that this landslide could be part of the broader landscape evolution changes to alpine terrain caused by a warming climate, leading to thawing alpine permafrost.
Dominic T. Robson and Andreas C. W. Baas
EGUsphere, https://doi.org/10.5194/egusphere-2023-2900, https://doi.org/10.5194/egusphere-2023-2900, 2023
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We present simulations of large populations (swarms) of a type of sand dune known as barchans. Our findings reveal that the rate at which sand moves inside an asymmetric barchan is vital to the behaviour of swarms and that many observed properties of the dunes can be explained by similar rates. We also show that different directions of the wind and the density of dunes added to swarms play important roles in shaping their evolution.
Christopher Tomsett and Julian Leyland
Earth Surf. Dynam., 11, 1223–1249, https://doi.org/10.5194/esurf-11-1223-2023, https://doi.org/10.5194/esurf-11-1223-2023, 2023
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Vegetation influences how rivers change through time, yet the way in which we analyse vegetation is limited. Current methods collect detailed data at the individual plant level or determine dominant vegetation types across larger areas. Herein, we use UAVs to collect detailed vegetation datasets for a 1 km length of river and link vegetation properties to channel evolution occurring within the study site, providing a new method for investigating the influence of vegetation on river systems.
Rabab Yassine, Ludovic Cassan, Hélène Roux, Olivier Frysou, and François Pérès
Earth Surf. Dynam., 11, 1199–1221, https://doi.org/10.5194/esurf-11-1199-2023, https://doi.org/10.5194/esurf-11-1199-2023, 2023
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Predicting river morphology evolution is very complicated, especially for mountain rivers with complex morphologies such as the Lac des Gaves reach in France. A 2D hydromorphological model was developed to reproduce the channel's evolution and provide reliable volumetric predictions while revealing the challenge of choosing adapted sediment transport and friction laws. Our model can provide decision-makers with reliable predictions to design suitable restoration measures for this reach.
Daisuke Harada and Shinji Egashira
Earth Surf. Dynam., 11, 1183–1197, https://doi.org/10.5194/esurf-11-1183-2023, https://doi.org/10.5194/esurf-11-1183-2023, 2023
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This paper proposes a method for describing large-wood behavior in terms of the convection equation and the storage equation, which are associated with active sediment erosion and deposition. Compared to the existing Lagrangian method, the proposed method can easily simulate the behavior of large wood in the flow field with active sediment transport. The method is applied to the flood disaster in the Akatani River in 2017, and the 2-D flood flow computations are successfully performed.
Hemanti Sharma and Todd A. Ehlers
Earth Surf. Dynam., 11, 1161–1181, https://doi.org/10.5194/esurf-11-1161-2023, https://doi.org/10.5194/esurf-11-1161-2023, 2023
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Seasonality in precipitation (P) and vegetation (V) influences catchment erosion (E), although which factor plays the dominant role is unclear. In this study, we performed a sensitivity analysis of E to P–V seasonality through numerical modeling. Our results suggest that P variations strongly influence seasonal variations in E, while the effect of seasonal V variations is secondary but significant. This is more pronounced in moderate and least pronounced in extreme environmental settings.
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.
Christoph Rettinger, Mina Tabesh, Ulrich Rüde, Stefan Vollmer, and Roy M. Frings
Earth Surf. Dynam., 11, 1097–1115, https://doi.org/10.5194/esurf-11-1097-2023, https://doi.org/10.5194/esurf-11-1097-2023, 2023
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Packing models promise efficient and accurate porosity predictions of fluvial sediment deposits. In this study, three packing models were reviewed, calibrated, and validated. Only two of the models were able to handle the continuous and large grain size distributions typically encountered in rivers. We showed that an extension by a cohesion model is necessary and developed guidelines for successful predictions in different rivers.
Alexander A. Ermilov, Gergely Benkő, and Sándor Baranya
Earth Surf. Dynam., 11, 1061–1095, https://doi.org/10.5194/esurf-11-1061-2023, https://doi.org/10.5194/esurf-11-1061-2023, 2023
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A novel, artificial-intelligence-based riverbed sediment analysis methodology is introduced that uses underwater images to identify the characteristic sediment classes. The main novelties of the procedure are as follows: underwater images are used, the method enables continuous mapping of the riverbed along the measurement vessel’s route contrary to conventional techniques, the method is cost-efficient, and the method works without scaling.
Kelly M. Sanks, John B. Shaw, Samuel M. Zapp, José Silvestre, Ripul Dutt, and Kyle M. Straub
Earth Surf. Dynam., 11, 1035–1060, https://doi.org/10.5194/esurf-11-1035-2023, https://doi.org/10.5194/esurf-11-1035-2023, 2023
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River deltas encompass many depositional environments (like channels and wetlands) that interact to produce coastal environments that change through time. The processes leading to sedimentation in wetlands are often neglected from physical delta models. We show that wetland sedimentation constrains flow to the channels, changes sedimentation rates, and produces channels more akin to field-scale deltas. These results have implications for the management of these vulnerable coastal landscapes.
Katharina Wetterauer and Dirk Scherler
Earth Surf. Dynam., 11, 1013–1033, https://doi.org/10.5194/esurf-11-1013-2023, https://doi.org/10.5194/esurf-11-1013-2023, 2023
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In glacial landscapes, debris supply rates vary spatially and temporally. Rockwall erosion rates derived from cosmogenic 10Be concentrations in medial moraine debris at five Swiss glaciers around Pigne d'Arolla indicate an increase in erosion from the end of the Little Ice Age towards deglaciation but temporally more stable rates over the last ∼100 years. Rockwall erosion rates are higher where rockwalls are steep and north-facing, suggesting a potential slope and temperature control.
Sam Anderson, Nicole Gasparini, and Joel Johnson
Earth Surf. Dynam., 11, 995–1011, https://doi.org/10.5194/esurf-11-995-2023, https://doi.org/10.5194/esurf-11-995-2023, 2023
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We measured rock strength and amount of fracturing in the two different rock types, sandstones and carbonates, in Last Chance Canyon, New Mexico, USA. Where there is more carbonate bedrock, hills and channels steepen in Last Chance Canyon. This is because the carbonate-type bedrock tends to be more thickly bedded, is less fractured, and is stronger. The carbonate bedrock produces larger boulders than the sandstone bedrock, which can protect the more fractured sandstone bedrock from erosion.
Jens M. Turowski, Gunnar Pruß, Anne Voigtländer, Andreas Ludwig, Angela Landgraf, Florian Kober, and Audrey Bonnelye
Earth Surf. Dynam., 11, 979–994, https://doi.org/10.5194/esurf-11-979-2023, https://doi.org/10.5194/esurf-11-979-2023, 2023
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Rivers can cut into rocks, and their strength modulates the river's erosion rates. Yet, which properties of the rock control its response to erosive action is poorly understood. Here, we describe parallel experiments to measure rock erosion rates under fluvial impact erosion and the rock's geotechnical properties such as fracture strength, elasticity, and density. Erosion rates vary over a factor of a million between different rock types. We use the data to improve current theory.
Koji Ohata, Hajime Naruse, and Norihiro Izumi
Earth Surf. Dynam., 11, 961–977, https://doi.org/10.5194/esurf-11-961-2023, https://doi.org/10.5194/esurf-11-961-2023, 2023
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We investigated the influence of sediment transport modes on the formation of bedforms using theoretical analysis. The results of the theoretical analysis were verified with published data of plane beds obtained by fieldwork and laboratory experiments. We found that suspended sand particles can promote the formation of plane beds on a fine-grained bed, which suggests that the presence of suspended particles suppresses the development of dunes under submarine sediment-laden gravity currents.
Matan Ben-Asher, Florence Magnin, Sebastian Westermann, Josué Bock, Emmanuel Malet, Johan Berthet, Ludovic Ravanel, and Philip Deline
Earth Surf. Dynam., 11, 899–915, https://doi.org/10.5194/esurf-11-899-2023, https://doi.org/10.5194/esurf-11-899-2023, 2023
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Quantitative knowledge of water availability on high mountain rock slopes is very limited. We use a numerical model and field measurements to estimate the water balance at a steep rock wall site. We show that snowmelt is the main source of water at elevations >3600 m and that snowpack hydrology and sublimation are key factors. The new information presented here can be used to improve the understanding of thermal, hydrogeological, and mechanical processes on steep mountain rock slopes.
Jessica Droujko, Srividya Hariharan Sudha, Gabriel Singer, and Peter Molnar
Earth Surf. Dynam., 11, 881–897, https://doi.org/10.5194/esurf-11-881-2023, https://doi.org/10.5194/esurf-11-881-2023, 2023
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We combined data from satellite images with data measured from a kayak in order to understand the propagation of fine sediment in the Vjosa River. We were able to find some storm-activated and some permanent sources of sediment. We also estimated how much fine sediment is carried into the Adriatic Sea by the Vjosa River: approximately 2.5 Mt per year, which matches previous findings. With our work, we hope to show the potential of open-access satellite images.
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....
