Journal of Geophysical Research: Earth Surface最新文献_第10页

Multiple Evolution Modes of Megaripples in the Qaidam Basin and Implications for Ripple-Like Aeolian Landforms on Mars 柴达木盆地巨型砾石的多种演化模式及其对火星波纹状风化地貌的启示

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-03-11 DOI: 10.1029/2023JF007417

Chao Li, Zhi Zhang, Lupeng Yu, Guoxiang Chen, Junhuai Yang, Zhibao Dong

{"title":"Multiple Evolution Modes of Megaripples in the Qaidam Basin and Implications for Ripple-Like Aeolian Landforms on Mars","authors":"Chao Li, Zhi Zhang, Lupeng Yu, Guoxiang Chen, Junhuai Yang, Zhibao Dong","doi":"10.1029/2023JF007417","DOIUrl":"https://doi.org/10.1029/2023JF007417","url":null,"abstract":"Aeolian landforms provide valuable insights into the planetary surface environment and its evolutionary history. In this study, the formation and evolution of megaripples in the Qaidam Basin and their relationship with the development environment are analyzed. By quantifying the wind environment, morphology, grain-size distribution, sedimentary structure, and luminescence age of megaripples, we propose for the first time that there are multiple megaripple evolution modes. Investigation revealed that three evolution modes were responsible for forming megaripples in different equilibrium states: transient, stable, and metastable. Well-sorted coarse sand grains accumulate on ridges and overlay poorly sorted fine sand grains to form transient megaripples. Stable megaripples have alternating sedimentary bedding of coarse and fine sand grains. Metastable megaripples have a secondary ripple formation on the surface. Throughout their formation, coarse and fine sand grains undergo regrouping. The response of coarse grains to the change in wind speed lags behind that of fine grains. This process controls the erosion and accumulation of megaripples and affects their size and sedimentary structures. The evolution mode, scale, and sedimentary structure of megaripples are influenced by the grain-size range under the same wind conditions. The luminescence ages of the coarse-grained megaripple sediments are less than 700 years. This study provides a fresh perspective on the coexistence of various sand ripples and transverse aeolian ridges found on Mars.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JF007417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140104446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controls on the Leeside Angle of Dunes in Shallow Unidirectional Flows 浅层单向流中沙丘利边角的控制因素

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-03-08 DOI: 10.1029/2023JF007520

Julia Cisneros, Jim Best

{"title":"Controls on the Leeside Angle of Dunes in Shallow Unidirectional Flows","authors":"Julia Cisneros, Jim Best","doi":"10.1029/2023JF007520","DOIUrl":"https://doi.org/10.1029/2023JF007520","url":null,"abstract":"Dunes are ubiquitous features in alluvial channels, serve as major agents of sediment transport and contribute significantly to flow resistance. Research in the past decade has illustrated the complexity of dune geometry and widespread occurrence of dunes that have a low leeside angle. However, there is a debate concerning the occurrence of such dunes and their formative processes. This paper seeks to further our understanding of low-angle dunes by utilizing data from a robust set of shallow flow laboratory experiments detailing equilibrium bedform morphology across a range of sediment transport conditions. Analysis of bedform morphology demonstrates that dunes with low-angle leesides are generated in shallow laboratory flows and are not restricted to deep rivers. Of the possible processes that have been proposed to explain the formation of low-angle dunes, this finding unequivocally shows that liquefied leeside avalanches, which rely on deep flows for their generation, are not a controlling mechanism. In addition, dunes formed under suspension-dominated conditions possess lower leeside angles compared with those formed under bedload-dominated conditions. However, where bedload transport dominates and sediment suspension is likely of lesser importance, low-angle dunes are still present, and preliminary analysis shows that bedform superimposition can result in lowering of the dune leeside angle. Low and intermediate angle dunes formed under these various conditions also have a lower potential for large-scale, permanent, leeside flow separation compared with angle-of-repose dunes, confirming the need to account for these differences in predictions of flow resistance associated with dune form roughness.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JF007520","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140063731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wave-Driven Vertical Sorting of Density-Varying Particles 波驱动的密度可变颗粒垂直分拣技术

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-03-05 DOI: 10.1029/2023JF007320

Jiaye Zhang, Yashar Rafati, Tian-Jian Hsu, Joseph Calantoni, Steve Romaniello

{"title":"Wave-Driven Vertical Sorting of Density-Varying Particles","authors":"Jiaye Zhang, Yashar Rafati, Tian-Jian Hsu, Joseph Calantoni, Steve Romaniello","doi":"10.1029/2023JF007320","DOIUrl":"https://doi.org/10.1029/2023JF007320","url":null,"abstract":"It has been recognized that the vertical sorting of polydispersed sand grains via the “Brazil Nut effect” can lead to inverse grading (upward coarsening) in the surface layer of a sand bed. However, the addition of nonnative particles not inherently observed on the beach, characterized by different densities and sizes, may complicate the vertical sorting processes and the fate of the nonnative particles. For example, olivine particles, which may be released on natural sandy beaches to facilitate carbon dioxide capture via weathering from wave action, have a density about 25% larger than the typical native sands. An Eulerian-Lagrangian model, which couples Computational Fluid Dynamics for the fluid phase and Discrete Element Method for the particle phase was utilized to investigate how the so-called “Reverse Brazil Nut effect” due to the larger density of nonnative (olivine) particles may be counteracted by the so-called “Brazil Nut effect” for a range of nonnative particle sizes. Numerical simulations showed that the higher-density nonnative particles tended to sink into the sand bed consistent with the “Reverse Brazil Nut effect”; however, the vertical sorting structure of native sand, driven by the “Brazil Nut effect,” also was a controlling factor determining the fate of nonnative particles. To maintain the presence of the nonnative (olivine) particles in the active layer of sediment transport, the higher-density nonnative particle size must be larger than the mean native sand size found at the bottom of the active layer.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140043005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrologic and Landscape Controls on Rock Weathering Along a Glacial Gradient in South Central Alaska, USA 美国阿拉斯加中南部冰川梯度岩石风化的水文和景观控制因素

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-03-02 DOI: 10.1029/2023JF007255

S. Muñoz, J. Jenckes, E. J. Ramos, L. A. Munk, D. E. Ibarra

{"title":"Hydrologic and Landscape Controls on Rock Weathering Along a Glacial Gradient in South Central Alaska, USA","authors":"S. Muñoz, J. Jenckes, E. J. Ramos, L. A. Munk, D. E. Ibarra","doi":"10.1029/2023JF007255","DOIUrl":"https://doi.org/10.1029/2023JF007255","url":null,"abstract":"Rock weathering impacts atmospheric CO2 levels with silicate rock dissolution removing CO2, and carbonate dissolution, pyrite oxidation, and organic rock carbon oxidation producing CO2. Glacierization impacts the hydrology and geomorphology of catchments and glacier retreat due to warming can increase runoff and initiate landscape succession. To investigate the impact of these changes on catchment scale weathering CO2 balances, we report monthly samples of solute chemistry and continuous discharge records for a sequence of glacierized watersheds draining into Kachemak Bay, Alaska. We partition solute and acid sources and estimate inorganic weathering CO2 balances using an inverse geochemical mixing model. Furthermore, we investigated how solutes vary with discharge conditions utilizing a concentration-runoff framework. We develop an analogous fraction-runoff framework which allows us to investigate changes in weathering contributions at different flows. Fraction-runoff relationships suggest kinetic limitations on all reactions in glacierized catchments, and only silicate weathering in less glacierized catchments. Using forest cover as a proxy for landscape age and stability, multiple linear regression shows that faster reactions (pyrite oxidation) contribute less to the solute load with increasing forest cover, whereas silicate weathering (slow reaction kinetics) contributes more. Overall, in glacierized catchments, we find elevated weathering fluxes at high runoff despite significant dilution effects. This makes flux estimates that account for dilution more important in glacierized catchments. Our findings quantify how glaciers modify the inorganic weathering CO2 balance of catchments through hydrologic and geomorphic forcings, and support the previous hypothesis that deglaciation will be accompanied by a shift in inorganic weathering CO2 balances.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140014989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Mechanistic Model and Experiments on Bedrock Incision and Channelization by Rockfall 岩石崩落造成基岩切变和沟道化的机理模型与实验

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-02-28 DOI: 10.1029/2023JF007504

A. R. Beer, J. N. Fischer, T. P. Ulizio, Z. Ma, Z. Sun, M. P. Lamb

{"title":"A Mechanistic Model and Experiments on Bedrock Incision and Channelization by Rockfall","authors":"A. R. Beer, J. N. Fischer, T. P. Ulizio, Z. Ma, Z. Sun, M. P. Lamb","doi":"10.1029/2023JF007504","DOIUrl":"https://doi.org/10.1029/2023JF007504","url":null,"abstract":"Rockfall and rock avalanches are common in steep terrain on Earth and potentially on other planetary bodies such as the Moon and Mars. Since impacting rocks can damage exposed bedrock as they roll and bounce downhill, rockfall might be an important erosive agent in steep landscapes, even in the absence of water. We developed a new theory for rockfall-driven bedrock abrasion using the ballistic trajectories of rocks transported under gravity. We calibrated this theory using laboratory experiments of rockfall over an inclined bedrock simulant. Both the experiments and the model demonstrate that bedrock hillslopes can be abraded by dry rockfall, even at gradients below the angle of repose, depending on the bedrock roughness. Feedback between abrasion and topographic steering of rockfall can produce channel-like forms, such as bedrock chutes, in the absence of water. Particle size has a dominant influence on abrasion rates and runout distances, while the hillslope angle has a comparatively minor influence. Rockfall transport is sensitive to bedrock roughness; terrain with high friction angles can trap rocks creating patches of rock cover that affect subsequent rockfall pathways. Our results suggest that dry rockfall can play an important role in eroding and channelizing steep, rocky terrain on Earth and other planets, such as crater degradation on the Moon and Mars.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JF007504","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139993865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

System-Wide Effects of Local Bed Disturbance on the Morphological Evolution of a Bifurcating Channel Network 局部河床扰动对分叉河道网络形态演变的全系统影响

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-02-26 DOI: 10.1029/2023JF007514

Weilun Gao, Dongdong Shao, Zheng Bing Wang, Zhenchang Zhu, Zhifeng Yang

{"title":"System-Wide Effects of Local Bed Disturbance on the Morphological Evolution of a Bifurcating Channel Network","authors":"Weilun Gao, Dongdong Shao, Zheng Bing Wang, Zhenchang Zhu, Zhifeng Yang","doi":"10.1029/2023JF007514","DOIUrl":"https://doi.org/10.1029/2023JF007514","url":null,"abstract":"Deltaic channel networks are important conduits for water and material supplies to the fluvial and coastal communities. However, increasing human interventions in river deltas have altered the topology and geometry of channel networks as well as their long-term evolution. While the morphological evolution of a single channel has received extensive studies, the system-wide morphological responses of channel networks to local disturbances remain largely unclear. Here we investigate the morphological responses of a bifurcating channel network subject to local disturbance of channel deepening due to dredging and sand mining through idealized simulations, and further compare the results with the reference scenarios of a single channel and theoretical analysis of the phase plane. The results show that the infilling of the local deepening is associated with the erosion of the entire branch, which also causes system-wide effects on the siltation of the other branch. The morphological responses of the bifurcating channel network consist of a relatively short stage for the infilling of the local deepening followed by a relatively long stage for recovering the equilibrium configuration of the river bifurcation. The system-wide effects of the local disturbance arise from the altered water surface slope and water partitioning downstream of the bifurcation due to the local deepening. Also, the prolonged recovery of the equilibrium configuration is consistent with theoretical analysis, which reveals a slow evolution of the bifurcation when approaching the equilibrium. Our results can help understand the long-term morphological responses of large-scale complex channel networks and inform water managements under increasing human interventions.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139976575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Storm Impacts on Mineral Mass Accumulation Rates of Coastal Marshes 风暴对沿海沼泽矿物质量累积率的影响

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-02-26 DOI: 10.1029/2023JF007065

L. Cortese, X. Zhang, Marc Simard, S. Fagherazzi

{"title":"Storm Impacts on Mineral Mass Accumulation Rates of Coastal Marshes","authors":"L. Cortese, X. Zhang, Marc Simard, S. Fagherazzi","doi":"10.1029/2023JF007065","DOIUrl":"https://doi.org/10.1029/2023JF007065","url":null,"abstract":"Coastal marsh survival may be compromised by sea-level rise, limited sediment supply, and subsidence. Storms represent a fundamental forcing for sediment accumulation in starving marshes because they resuspend bottom material in channels and tidal flats and transport it to the marsh surface. However, it is unrealistic to simulate at high resolution all storms that occurred in the past decades to obtain reliable sediment accumulation rates. Similarly, it is difficult to cover all possible combinations of water levels and wind conditions in fictional scenarios. Thus, we developed a new method that derives long-term deposition rates from short-term deposition generated by a finite number of storms. Twelve storms with different intensity and frequency were selected in Terrebonne Bay, Louisiana, USA and simulated with the 2D Delft3D-FLOW model coupled with the Simulating Waves Nearshore (SWAN) module. Storm impact was analyzed in terms of geomorphic work, namely the product of deposition and frequency. To derive the long-term inorganic mass accumulation rates, the new method generates every possible combination of the 12 chosen storms and uses a linear model to fit modeled inorganic deposition with measured inorganic mass accumulation rates. The linear model with the best fit (highest R2) was used to derive a map of inorganic mass accumulation rates. Results show that a storm with 1.7 ± 1.6 years return period provides the largest geomorphic work, suggesting that the most impactful storms are those that balance intensity with frequency. Model results show higher accumulation rates in marshes facing open areas where waves can develop and resuspend sediments. This method has the advantage of considering only a few real scenarios and can be applied in any marsh-bay system.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139976576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Timescale of the Morphodynamic Feedback Between Planform Geometry and Lateral Migration of Meandering Rivers 蜿蜒河流的平面几何与侧向迁移之间的形态动力反馈的时间尺度

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-02-23 DOI: 10.1029/2023JF007413

Y. Li, A. B. Limaye

{"title":"Timescale of the Morphodynamic Feedback Between Planform Geometry and Lateral Migration of Meandering Rivers","authors":"Y. Li, A. B. Limaye","doi":"10.1029/2023JF007413","DOIUrl":"https://doi.org/10.1029/2023JF007413","url":null,"abstract":"Across varied environments, meandering channels evolve through a common morphodynamic feedback: the sinuous channel shape causes spatial variations in boundary shear stress, which cause lateral migration rates to vary along a meander bend and change the shape of the channel. This feedback is embedded in all conceptual models of meandering channel migration, and in numerical models, it occurs over an explicit timescale (i.e., the model time step). However, the sensitivity of modeled channel trajectory to the time step is unknown. In numerical experiments using a curvature-driven model of channel migration, we find that channel trajectories are consistent over time if the channel migrates ≤10% of the channel width over the feedback timescale. In contrast, channel trajectories diverge if the time step causes migration to exceed this threshold, due to the instability in the co-evolution of channel curvature and migration rate. The divergence of channel trajectories accumulates with the total run time. Application to hindcasting of channel migration for 10 natural rivers from the continental US and the Amazon River basin shows that the sensitivity of modeled channel trajectories to the time step is greatest at low (near-unity) channel sinuosity. A time step exceeding the criterion causes over-prediction of the width of the channel belt developed over millennial timescales. These findings establish a geometric constraint for predicting channel migration in landscape evolution models for lowland alluvial rivers, upland channels coupled to hillslopes and submarine channels shaped by turbidity currents, over timescales from years to millennia.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JF007413","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139942949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variations in Subsidence Patterns in the Gulf of Mexico Passive Margin From Airborne-LiDAR Data and Time Series InSAR: Baton Rouge Case Study 从机载激光雷达数据和时间序列 InSAR 看墨西哥湾被动边缘的沉降模式变化：巴吞鲁日案例研究

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-02-23 DOI: 10.1029/2023JF007406

Carolina Hurtado-Pulido, Reda Amer, Cynthia Ebinger, Hayden Holcomb

{"title":"Variations in Subsidence Patterns in the Gulf of Mexico Passive Margin From Airborne-LiDAR Data and Time Series InSAR: Baton Rouge Case Study","authors":"Carolina Hurtado-Pulido, Reda Amer, Cynthia Ebinger, Hayden Holcomb","doi":"10.1029/2023JF007406","DOIUrl":"https://doi.org/10.1029/2023JF007406","url":null,"abstract":"The Coast of Louisiana is affected by accelerating sea level rise compounded by land subsidence, leading to land loss. Vertical crustal motions in the region are caused by natural and anthropogenic processes that vary temporally and spatially across the Gulf of Mexico. We investigate the role of growth faulting contributions to subsidence in a case study of Baton Rouge, where two E-W striking, down-to-the-south normal faults, the Denham Springs and Baton Rouge faults, cut compacted Pleistocene strata, and where sediment compaction should be minimal. We used InSAR time series and LiDAR differencing data spanning 1999–2020 to quantify modern vertical and horizontal displacements. After calibration with GNSS data, both methods reveal similar spatial patterns in ground motion, with the faults delimiting areas with different absolute rates. On average the area north of the Baton Rouge fault is subsiding faster than the south, opposite to the long-term sense of fault slip. LiDAR mean vertical rates range between −5 to −11 mm/y and −2.4 to −7 mm/y. InSAR time-series mean rates in the LOS direction range between −10.9 to −13.6 mm/y and −8 to −10.6 mm/y, respectively, for the north and south areas. Subsidence in the northern area likely is controlled by groundwater level changes caused by pumping as indicated by groundwater extraction models. The southern area average is likely influenced by the injection of fluids. Our results suggest volumetric changes caused by fluid extraction and injection in regions separated by growth faults that are creeping to accommodate the spatial variations in subsidence.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JF007406","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139942948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling the Flow and Geomorphic Heterogeneity Induced by Salt Marsh Vegetation Patches Based on Convolutional Neural Network UNet-Flow 基于卷积神经网络 UNet-Flow 的盐沼植被斑块诱导的水流和地貌异质性建模

IF 3.9 2区地球科学

Journal of Geophysical Research: Earth Surface Pub Date : 2024-02-21 DOI: 10.1029/2023JF007336

Zhipeng Chen, Feng Luo, Ruijie Li, Chi Zhang

{"title":"Modeling the Flow and Geomorphic Heterogeneity Induced by Salt Marsh Vegetation Patches Based on Convolutional Neural Network UNet-Flow","authors":"Zhipeng Chen, Feng Luo, Ruijie Li, Chi Zhang","doi":"10.1029/2023JF007336","DOIUrl":"https://doi.org/10.1029/2023JF007336","url":null,"abstract":"The two-way interactions between biological and physical processes, bio-geomorphic feedback, play a vital role in landscape formation and evolution in salt marshes. Patchy vegetation represents a typical form of scale-dependent feedback in salt marshes and is primarily responsible for the formation of efficient drainage networks. The intuitive manifestation of scale-dependent feedback is the heterogeneity of flow and landscape. Process-based modeling is an essential tool for exploring flow heterogeneity, but calculations for small spatial scales and over long time frames can be prohibitively costly. In this study, we proposed a deep learning model architecture, UNet-Flow, based on convolutional neural networks (CNNs), which is used to build a surrogate model to simulate a flow field induced by salt marsh patchy vegetation. After optimizing and evaluating the model, we discovered that UNet-Flow exhibits a speed improvement of over four orders of magnitude compared to single-process simulations using the free surface flow model TELEMAC-2D, with acceptable levels of error. Furthermore, we proposed an approach that combines the process-based model SISYPHE with the deep learning method to model geomorphic heterogeneity. After numerous simulations of flow heterogeneity modeling using UNet-Flow, we obtained a significant logarithmic relationship between scale-dependent feedback strength and vegetation stem density, and an ascending-descending trend in feedback strength was observed as the number or surface area of vegetation patches increased. Finally, we investigated the relationship between geomorphic heterogeneity and vegetation-related variables. This study represents a noteworthy effort to study bio-geomorphology using deep learning methods.","PeriodicalId":15887,"journal":{"name":"Journal of Geophysical Research: Earth Surface","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139915660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0