Impacts of different rainfall locations on sediment erosion

被引：0

作者：

Shi, Zhi-Nan ^{[1
]}

Ran, Qi-Hua ^{[1
]}

Wu, Xiu-Shan ^{[1
]}

Chen, Hui-Jun ^{[2
]}

机构：

[1] Department of Hydraulic Engineering, Zhejiang University, Hangzhou

[2] China international water and electric Corporation, Beijing

来源：

Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2014年 / 48卷 / 08期

关键词：

Process curve; Rainfall intensity; Rainfall location; Sediment concentration; Soil erosion;

D O I：

10.3785/j.issn.1008-973X.2014.08.003

中图分类号：

学科分类号：

摘要：

Pl-ot-scale laboratory experiments were conducted to study the impacts of different rainfall locations, as well as the related rainfall properties, on the hillslope soil erosion process. Three scenarios with different rainfall location were considered. The results showed that: peak discharge of both sediment and runoff decreased significantly as the rainfall getting farther from the outlet, and the erosion amount kept decreasing for the successive experiments. Both the largest value and the maximum decrease, between successive experiments, of peak sediment discharge occurred when rainfall is 2 m away from the outlet. Total sediment discharge was heavily influenced by rainfall intensity, while rainfall location played an important role when the intensity was weak. For the first experiment during each successive run, sediment concentration decreased as the rainfall getting farther from the outlet. Content of sand in the eroded material was significantly lower than the original soil composition on slope. On the whole, sediment concentration process curve in experiments of 3 m rainfall location reached stable state earlier than other scenarios, and resulted in the minimum standard deviation for the gradation of eroded material.

引用

页码：1362 / 1369

页数：7

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