Experimental Study of Rill Flow Velocity on Loess Hillslope

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

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Experimental Study of Rill Flow Velocity on Loess Hillslope

- Experimental Study of Rill Flow Velocity on Loess Hillslope
- Bulletin of Soiland Water Conservation Vol. 31, Issue 5, Pages: 117-121(2012)
- 作者机构：
  
  1. 西北农林科技大学资源环境学院, 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
  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, 陕西杨凌,712100
  4. 钦州市水土保持监测分站,广西,钦州,535000
- 作者简介：
- 基金信息：
- DOI：
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- Published：2012
- 稿件说明：
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JIAO Nian, WANG Zhan-li, LIU Jun-e, et al. Experimental Study of Rill Flow Velocity on Loess Hillslope[J]. Bulletin of Soiland Water Conservation, 2012, 31(5): 117-121.
DOI：

JIAO Nian, WANG Zhan-li, LIU Jun-e, et al. Experimental Study of Rill Flow Velocity on Loess Hillslope[J]. Bulletin of Soiland Water Conservation, 2012, 31(5): 117-121. DOI：

摘要

流速是最基本、最重要的水流水力学参数之一

阐明细沟水流流速变化的特征对于揭示坡面细沟侵蚀动力学过程机理具有重要作用。采用具有定流量人工放水的组合小区模拟降雨试验方法

对黄土坡面细沟水流流速进行了试验研究。结果表明:(1)细沟径流流速随径流历时的变化过程在不同雨强下不断递减

可用指数方程很好地描述

递减速率在产流后6min内较大

以后减小

各雨强下递减速率基本分别一致;(2)细沟径流流速随径流历时的变化过程在不同坡度下也不断减小

可用指数方程很好地描述

各坡度下变化趋势一致

整个径流过程中减小速率也基本一致; (3)细沟水流平均流速随雨强增大而增大

可用对数方程很好地描述; 随坡度增大而增大

可用幂函数方程很好地描述; 随雨强及坡度的变化可用二元对数方程描述。

Abstract

Flow velocity is one of the most basic and important hydraulic parameters. Clarifying the variation of rill flow velocity is of importance to reveal the mechanisms of dynamic rill erosion processes. Rill flow ve-locity on loess hillslope is studied through a multi-plot experiment under simulated rainfall with the addition of a steady in-flow at the top of the multi-plot system. The main findings are as follows:(1)Rill flow veloci-ties for different rainfall intensities decrease with runoff duration

which can be well described by an expo-nential equation.The decrements are great 6 min after runoff generation and then decline. The tendencies arebasically consistent for the decrements at different intensities. (2)Rill flow velocities for different slopes also decrease with runoff duration

which can be described by an exponential equation.The tendencies for the decrements on different slopes are consistent. The decrements are basically consistent during the whole run-off process. (3)The mean flow velocity increases with increased rainfall intensity

which can be well de-scribed by a logarithmic equation

and increases with increased slope steepness

which can be well described by apower equation. A dual logarithmic equation can be used to describe the variation of the mean flow ve-locity with rainfall intensity and slope

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Related Author

LU Shao-juan

WANG Zhan-li

TAN Zhen-xue

JIAO Nian

WANG Sha

LIU Jun-e

WANG Zhan-li

SHEN Nan

Related Institution

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

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

Sub-station of Soil and Water Conservation Monitoring Qinzhou Guangxi China

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

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