Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025407 |
Morphodynamic Modeling of Sediment Pulse Dynamics | |
Morgan, Jacob A.1,2; Nelson, Peter A.1 | |
2019-11-07 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | USA |
英文摘要 | Sediment pulses, defined as discrete, temporary increases in sediment supply, enter channels through both natural and anthropogenic means. The movement of the resultant deposit (sediment wave) in coarse-bedded channels is generally characterized by some combination of translation and dispersion; however, how sediment waves evolve over time is still poorly understood, potentially hampering restoration efforts that involve the introduction of sediment to channels. Here we use a one-dimensional morphodynamic model to explore how different pulse characteristics affect sediment wave movement. Our one-dimensional model uses the standard step backwater method to compute hydrodynamics and determines morphodynamics by computing bedload transport and retaining vertical grain size stratigraphy. We explore the effect of pulse mass, initial wave spread, and composition (grain size) on subsequent sediment wave dynamics. Our results suggest higher relative rates of sediment wave dispersion to advection for larger pulses, waves with a smaller initial spread, and pulses composed of coarser material. In all simulations sediment wave celerity and spreading rates decayed through time as a power function. Waves of smaller total mass decayed at faster rates than those of larger mass. Simulations also show that sediment pulses attain a terminal amplitude, suggesting that some sediment waves may not completely disperse. Larger terminal amplitudes were associated with larger pulses and pulses composed of coarser grains. |
英文关键词 | sediment pulse morphodynamic modeling |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000494975500001 |
WOS关键词 | BED RIVER EVOLUTION ; DAM REMOVAL ; NUMERICAL-SIMULATION ; CYCLED HYDROGRAPHS ; MOUNTAIN RIVERS ; LOAD TRANSPORT ; GRAVEL ; CHANNEL ; WAVE ; DEPOSITION |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/188272 |
专题 | 资源环境科学 |
作者单位 | 1.Colorado State Univ, Dept Civil & Environm Engn, Ft Collins, CO 80523 USA; 2.Univ Washington, Dept Civil & Environm Engn, Seattle, WA 98195 USA |
推荐引用方式 GB/T 7714 | Morgan, Jacob A.,Nelson, Peter A.. Morphodynamic Modeling of Sediment Pulse Dynamics[J]. WATER RESOURCES RESEARCH,2019. |
APA | Morgan, Jacob A.,&Nelson, Peter A..(2019).Morphodynamic Modeling of Sediment Pulse Dynamics.WATER RESOURCES RESEARCH. |
MLA | Morgan, Jacob A.,et al."Morphodynamic Modeling of Sediment Pulse Dynamics".WATER RESOURCES RESEARCH (2019). |
条目包含的文件 | 条目无相关文件。 |
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