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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
    
Impacts of different rainfall locations on sediment erosion
SHI Zhi-nan1, RAN Qi-hua1, WU Xiu-shan1, CHEN Hui-jun2
1. Department of Hydraulic Engineering, Zhejiang University, Hangzhou 310058, China；2. China international water and electric Corporation, Beijing 100120, China
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Abstract  

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.

Published: 01 August 2014
CLC:  TV 115  
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SHI Zhi-nan, RAN Qi-hua, WU Xiu-shan, CHEN Hui-jun. Impacts of different rainfall locations on sediment erosion. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2014, 1(8): 1362-1369.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2014.08.003     OR     http://www.zjujournals.com/eng/Y2014/V1/I8/1362


不同降雨区域对泥沙侵蚀过程的影响

为了研究坡面不同降雨区域及相关降雨特性对泥沙侵蚀过程的影响,通过小尺度坡面人工降雨物理模型,设定坡面3个不同降雨区域对产流产沙响应展开研究.结果表明：峰值产沙量与峰值产流量随降雨距下游2至4 m的距离增加而明显减小,且各连续过程中峰值产沙量均逐场递减；距下游2 m降雨工况减幅最大,最大峰值产沙量出现在首场工况(4.897 g/s).总产沙量受降雨强度影响较大,在弱雨强工况中还受降雨离下游的距离显著影响.降雨位置对泥沙质量浓度过程曲线的影响在首场降雨过程最显著,降雨初期泥沙质量浓度随降雨区域离出口距离增大而显著减小.侵蚀产沙颗粒成质量分数较原始土样砂粒质量分数明显减少.总体上,在3 m位置降雨工况下泥沙质量浓度过程曲线较早呈现稳定状态,且侵蚀颗粒成分最均匀.

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[1] SHI Zhi-nan, RAN Qi-hua, WU Xiu-shan, CHEN Hui-jun. Impacts of different rainfall locations on sediment erosion[J]. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2014, 48(8): 1361-1369.