A Study of Rill Evolution Process and Sediment Yield Characteristics on Loess Slope

LIU Jun-ti; SUN Li-ying; ZHANG Xue-pei; CAI Qiang-guo; CHEN Jun-jie

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A Study of Rill Evolution Process and Sediment Yield Characteristics on Loess Slope

- A Study of Rill Evolution Process and Sediment Yield Characteristics on Loess Slope
- Bulletin of Soiland Water Conservation Vol. 32, Issue 3, Pages: 18-23(2013)
- 作者机构：
  
  1. 北京林业大学水土保持学院,北京,100083
  2. 中国科学院地理科学与资源研究所陆地水循环与地表过程重点实验室,北京,100101
- 作者简介：
- 基金信息：
- DOI：
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- Published：2013
- 稿件说明：
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LIU Jun-ti, SUN Li-ying, ZHANG Xue-pei, et al. A Study of Rill Evolution Process and Sediment Yield Characteristics on Loess Slope[J]. Bulletin of Soiland Water Conservation, 2013, 32(3): 18-23.
DOI：

LIU Jun-ti, SUN Li-ying, ZHANG Xue-pei, et al. A Study of Rill Evolution Process and Sediment Yield Characteristics on Loess Slope[J]. Bulletin of Soiland Water Conservation, 2013, 32(3): 18-23. DOI：

摘要

研究细沟发育及其产沙特征对细沟侵蚀预报模型至关重要。采用室内纯净水模拟降雨试验的方法

在不同坡度(10°

15°

20°

25°)和不同雨强(1.5

2.0mm/min)条件下

研究了细沟的发育过程

并讨论分析各发育阶段产沙特征及其影响因素。结果表明

根据坡面含沙量与细沟形态的变化特征

细沟侵蚀过程可划分为面蚀、细沟雏形、细沟发育、细沟调整4个阶段;各阶段的侵蚀量占坡面总侵蚀量的比例均不同

其中细沟发育阶段最大

约占总侵蚀量的40%;各阶段持续时间随着坡度的改变而改变;雨强增大对细沟间与细沟流速有促进作用

细沟流速为细沟间流速的0.75～1.77倍;坡面侵蚀速率受雨强与坡度的影响很大

在同一坡面上细沟流速与侵蚀速率的关系更紧密

但二者的定量关系有待进一步探索。

Abstract

A study of rill evolution process and sediment yield characteristics is important for rill erosion prediction model.At different slopes(10°

15°

20°and 25°)and different rainfall intensities(1.5and 2.0mm/min)

the indoor simulated rainfall experiment with pure water was conducted to study the specific rill evolution process.The relationships between rill development stages and influencing factors were discussed.According to the characteristics of sediment concentration and rill form

the rill development process was classified as the four states of surface erosion

initial rill form

rill development and rill adjustment.Results showed that the proportions of sediment yield to the total erosion were different for different stages.The proportion for the rill development was the largest

about 40% of the total erosion.The duration for each stage changed with slope.Increase in rainfall intensity had a promotion role in rill and interrill flow velocities. Rill flow velocity was 0.75～1.77times of interrill velocity.Rainfall intensity and slope had a great influence on erosion rate.The relationship between flow velocity and erosion rate was closer on the same slope

but the quantitative relationship should be explored further.

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