期刊论文详细信息
JOURNAL OF HYDROLOGY 卷:598
Prediction of rill sediment transport capacity under different subsurface hydrologic conditions
Article
Wang, Shuyuan1  Flanagan, Dennis C.1,2  Engel, Bernard A.1  Zhou, Na3 
[1] Purdue Univ, Dept Agr & Biol Engn, 225 South Univ St, W Lafayette, IN 47907 USA
[2] USDA ARS, Natl Soil Eros Res Lab, 275 South Russell St, W Lafayette, IN 47907 USA
[3] Hebei Univ Econ & Business, Coll Management Sci & Engn, 47 Xuefu Rd, Shijiazhuang 050000, Hebei, Peoples R China
关键词: Subsurface hydrology;    Sediment transport capacity;    Rill flow;    Water discharge adjustment;   
DOI  :  10.1016/j.jhydrol.2021.126410
来源: Elsevier
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【 摘 要 】

When estimating rill sediment transport capacity for overland flow conditions, almost all widely used models focus on the impacts of surface hydraulic conditions and particle characteristics. However, the subsurface hydrologic impacts on the soil erosion process cannot be ignored. The upward force by exfiltration and the downward force by infiltration give opposite direction forces on the particles, which further influence sediment transport under seepage and drainage conditions. The aim of this research was to investigate the quantitative impacts of subsurface hydrologic conditions on sediment transport capacity in rills and improve the estimation of one existing transport capacity model by considering subsurface hydrologic effects. In this study, 216 rill flow experiments were completed in a 3.0 m long flume which contained four rill channels with slope lengths of 0.5, 1.0, 2.0, and 3.0 m. The experiments were conducted on close to uniform sands with four water discharge rates on 4.56%, 8.75%, and 12.17% slopes under four subsurface hydrologic conditions. The sediment transport rates from 192 of the 216 runs were estimated to have reached the sediment transport capacities for the corresponding condition based on the changes of sediment transport rates along the slope length and the surface elevation changes of the bottom region in the rills. The results indicated that rill sediment transport capacity increased significantly from free drainage to saturation conditions, and these differences increased with greater water discharge rates and greater slope gradients. Small increases in rill sediment transport capacity were observed from saturation to the 10 cm seepage condition with relatively stable differences. The selected sediment transport capacity equation provided good predictions under saturation and seepage conditions. The adjustment of water discharge rates improved the sediment transport capacity predictions with the discrepancy ratio between predictions and observations (P.O0.5-2.0) increasing from 73.0 to 90.5% under the free drainage condition and reaching 100% under the saturation and seepage conditions.

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