Experimental Research on Rill Erosion of Loessial Slope and Evaluation on Soil Anti-scourability

LEI Jun-shan; YANG Qin-kei; ZHENG Fen-li

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Experimental Research on Rill Erosion of Loessial Slope and Evaluation on Soil Anti-scourability

- Experimental Research on Rill Erosion of Loessial Slope and Evaluation on Soil Anti-scourability
- Bulletin of Soiland Water Conservation Vol. 23, Issue 2, Pages: 1-4(2004)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所,陕西杨凌,712100
  2. 西北农林科技大学水土保持研究所,陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：
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- Published：2004
- 稿件说明：
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LEI Jun-shan, YANG Qin-kei, ZHENG Fen-li. Experimental Research on Rill Erosion of Loessial Slope and Evaluation on Soil Anti-scourability[J]. Bulletin of Soiland Water Conservation, 2004, 23(2): 1-4.
DOI：

LEI Jun-shan, YANG Qin-kei, ZHENG Fen-li. Experimental Research on Rill Erosion of Loessial Slope and Evaluation on Soil Anti-scourability[J]. Bulletin of Soiland Water Conservation, 2004, 23(2): 1-4. DOI：

摘要

通过室内放水冲刷试验

分析了坡面侵蚀过程中跌坑产生与发育的机理

阐明了朔源侵蚀、边壁崩塌和细沟下切侵蚀之间的相互关系。研究了各放水流量下坡面产沙及细沟径流的变化规律

建立了坡面产沙量与细沟面积比例和流量关系。本文通过对冲刷过程中各侵蚀营力的分析

得到了径流剪切作用产沙方程。研究表明

径流剪切产沙率和单位面积径流剪切力呈显著的正相关关系

土壤颗粒被分离的临界剪切力为0.258N/m

。

Abstract

On the basis of scouring experiments indoors

the mechanism of the drop pit'genesis and development during the process of slope erosion is analyzed

and the relationship among headcut

bank landslip and downcut has been expounded. The variation regularity of the runoff and the sediment yield in each discharge was studied

and the relationship among the sediment

the runoff and the proportion of the rill area was obtained. Analyzing each erosion stress on the slope during the scouring

we get the runoff shearing sediment equation. The study shows that the sediment yield from runoff shearing take on a good positive correlation with the average runoff shear stress

and the critical shear stress of the runoff

by which the soil grain can just be dispersed

is 0.258 N/m2.

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