The Action of Raindrop Splash on Sheet Flow Erosion

Wu Pute; Zhon Peihua

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The Action of Raindrop Splash on Sheet Flow Erosion

- The Action of Raindrop Splash on Sheet Flow Erosion
- Bulletin of Soiland Water Conservation Vol. 11, Issue 4, Pages: 19-26(1992)
- 作者机构：
  
  中国科学院水利部西北水土保持研究所陕西杨陵,712100
- 作者简介：
- 基金信息：
- DOI：
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- Published：1992
- 稿件说明：
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Wu Pute, Zhon Peihua. The Action of Raindrop Splash on Sheet Flow Erosion[J]. Bulletin of Soiland Water Conservation, 1992, 11(4): 19-26.
DOI：

Wu Pute, Zhon Peihua. The Action of Raindrop Splash on Sheet Flow Erosion[J]. Bulletin of Soiland Water Conservation, 1992, 11(4): 19-26. DOI：

摘要

试验采用人工模拟降雨方法

对薄层水流侵蚀的两个阶段——雨滴击溅及径流侵蚀进行了模拟试验研究。得出:在消除雨滴打击作用后

坡面侵蚀的主要营力为薄层水流的拖拽力（τ=rhsinα）

且径流侵蚀量S

与τ有下列关系式: S

=921.497τ

1.713

r=0.876 α=0.017 以上式为基础

即可从有雨滴打击作用下所产生的侵蚀量中推算出径流侵蚀量S

与雨滴侵蚀量S

。结果表明:S

一般占总侵蚀量的70%以上

最高可达95%

说明薄层水流侵蚀所产生的泥沙绝大部分是由雨滴击溅所致。因此

笔者认为坡度较小地段的薄层水流侵蚀

应以消除或降低雨滴击溅作用为其主要防治措施。

Abstract

The simulated rainfall tests have been carried out to approach two stages of raindrop splash and runoff erosion on sheet flow

It was obtained that the main stress of slope surface erosion is sheet flow stress (z=rhsina) where the action of raindrop splash is eliminatecs and the relationship between runoff erosion (Sa) and sheet flow stress is as Ss=92}1.497T1”3 (r=0. 876

a = 0.01).Based on this equation the runoff erosion (Sa) and raindrop erosion (SRe) can be calculaled from the total erosive amount which is caused by the action of raindrop splash .The results show that rain drop erosion(Saa)accounts for more than 700 of total erosion

and the maximum may reach 95%of that .It was indicated that the sediment of sheet flow erosion is mainly caused by raindrop splash .There fore，the authors hold that the lcey'measures to control sheet flow erosion，occurring at the land segment of Less steepness are to reduce or eliminate the raindrop splash

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Related Institution

Institute of Soil and Water Conservation,the Chinese Academy of Sciences and Ministry of Water Resources,Yangling District,Shaanxi Province,712100,PRC

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