Experimental Study of Rill Flow Resistance on Loess Hillslope

SHEN Nan; WANG Zhan-li; LIU Jun-e; TAN Zhen-xue; WANG Sha; JIAO Nian

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Experimental Study of Rill Flow Resistance on Loess Hillslope

- Experimental Study of Rill Flow Resistance on Loess Hillslope
- Bulletin of Soiland Water Conservation Vol. 31, Issue 6, Pages: 34-37(2012)
- 作者机构：
  
  1. 西北农林科技大学资源环境学院
  2. 西北农林科技大学水土保持研究所
  3. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
  4. 钦州市水土保持监测分站
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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SHEN Nan, WANG Zhan-li, LIU Jun-e, et al. Experimental Study of Rill Flow Resistance on Loess Hillslope[J]. Bulletin of Soiland Water Conservation, 2012, 31(6): 34-37.
DOI：

SHEN Nan, WANG Zhan-li, LIU Jun-e, et al. Experimental Study of Rill Flow Resistance on Loess Hillslope[J]. Bulletin of Soiland Water Conservation, 2012, 31(6): 34-37. DOI：

摘要

水流阻力是重要的水力学参数之一

阐明细沟水流阻力系数变化特征对于认识细沟水流水力学性质及细沟侵蚀动力学过程机理具有重要意义。采用具有定流量人工放水的组合小区模拟降雨试验方法

对黄土坡面细沟侵蚀过程中的水流阻力进行了试验研究。结果表明:(1)细沟水流阻力系数随径流历时的变化

在不同雨强条件下不断增加

增大趋势总体一致

产流15min后增速出现差异

可用指数方程很好地描述。(2)细沟水流阻力系数随径流历时的变化

在不同坡度条件下也不断增大

变化过程总体一致

产流15min后增速也出现差异

可用指数方程很好地描述

不同坡度下阻力系数差异较不同雨强下稍大。(3)细沟水流平均阻力系数随雨强增大而减小

可用对数方程进行描述;随坡度增大而增大

但增幅很小

可用指数方程描述;随雨强与坡度的变化可用二元指数方程描述。

Abstract

Water flow resistance is one of the important hydraulic parameters.Elucidating the variations of rill flow resistance coefficient is critical to understand the hydraulic properties of rill flow and the mechanisms of dynamic rill erosion process.The flow resistance involved in rill erosion processes on loess hillslope was studied by a multi-plot experiment under simulated rainfall with addition of steady in-flow through the tops of the plots.The results showed that rill flow resistance coefficients for different rainfall intensities showed a consistently increasing tendency increase with runoff duration.Fifteen minutes after the initiation of runoff

the increasing trend changed and could be well described by an exponential equation.The resistance coefficients for different slopes exhibited the exactly same trend.The average resistance coefficient of rill flow decreased with increasing rainfall intensity

which can be described by a logarithmic equation

while it increased slightly with increasing slope steepness

which can be described by an exponential equation.A dual exponential equation can be used to describe the variations of the average resistance coefficient with various rainfall intensity and slope steepness.

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Related Author

SHEN Nan

WANG Sha

LIU Jun-e

WANG Zhan-li

JIAO Nian

LU Shao-juan

WANG Zhan-li

TAN Zhen-xue

Related Institution

Institute of Soil and Water Conservation, Northwest A & F University, Yangling

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling

School of Resources and Environment, Northwest A & F University, Yangling

Institute of Soil and Water Conservation, Northwest A&F University Yangling Shaanxi China

State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau Yangling Shaanxi China

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