Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020845 |
Bed Surface Adjustments to Spatially Variable Flow in Low Relative Submergence Regimes | |
Monsalve, A.1,2; Yager, E. M.2 | |
2017-11-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | Chile; USA |
英文摘要 | In mountainous rivers, large relatively immobile grains partly control the local and reach-averaged flow hydraulics and sediment fluxes. When the flow depth is similar to the size of these grains (low relative submergence), heterogeneous flow structures and plunging flow cause spatial distributions of bed surface elevations, textures, and sedimentation rates. To explore how the bed surface responds to these flow variations we conducted a set of experiments in which we varied the relative submergence of staggered hemispheres (simulated large boulders) between runs. All experiments had the same average sediment transport capacity, upstream sediment supply, and initial bed thickness and grain size distribution. We combined our laboratory measurements with a 3-D flow model to obtain the detailed flow structure around the hemispheres. The local bed shear stress field displayed substantial variability and controlled the bed load transport rates and direction in which sediment moved. The divergence in bed shear stress caused by the hemispheres promoted size-selective bed load deposition, which formed patches of coarse sediment upstream of the hemisphere. Sediment deposition caused a decrease in local bed shear stress, which combined with the coarser grain size, enhanced the stability of this patch. The region downstream of the hemispheres was largely controlled by a recirculation zone and had little to no change in grain size, bed elevation, and bed shear stress. The formation, development, and stability of sediment patches in mountain streams is controlled by the bed shear stress divergence and magnitude and direction of the local bed shear stress field. |
英文关键词 | sediment transport fluvial geomorphology sediment patches low relative submergence regime spatially variable flow roughness |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418736700038 |
WOS关键词 | LARGE WOODY DEBRIS ; 3-DIMENSIONAL NUMERICAL-MODEL ; TURBULENT-FLOW ; SEDIMENT TRANSPORT ; CHANNEL MORPHOLOGY ; LOCAL SCOUR ; CLUSTER MICROFORM ; ALTERNATE BARS ; BOULDER ARRAY ; 2 CYLINDERS |
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/21814 |
专题 | 资源环境科学 |
作者单位 | 1.Univ La Frontera, Dept Ingn Obras Civiles, Francisco Salazar, Chile; 2.Univ Idaho, Ctr Ecohydraul Res, Civil Engn, Boise, ID 83709 USA |
推荐引用方式 GB/T 7714 | Monsalve, A.,Yager, E. M.. Bed Surface Adjustments to Spatially Variable Flow in Low Relative Submergence Regimes[J]. WATER RESOURCES RESEARCH,2017,53(11). |
APA | Monsalve, A.,&Yager, E. M..(2017).Bed Surface Adjustments to Spatially Variable Flow in Low Relative Submergence Regimes.WATER RESOURCES RESEARCH,53(11). |
MLA | Monsalve, A.,et al."Bed Surface Adjustments to Spatially Variable Flow in Low Relative Submergence Regimes".WATER RESOURCES RESEARCH 53.11(2017). |
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