Comparative Study on the Influence of Intermittent and Continuous Rainfall on Rill Erosion of Loess Slope

HE Yucong; ZHENG Haojie; HAN Jianqiao

doi:10.13870/j.cnki.stbcxb.2020.06.002

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Comparative Study on the Influence of Intermittent and Continuous Rainfall on Rill Erosion of Loess Slope

更新时间：2025-03-12

- Comparative Study on the Influence of Intermittent and Continuous Rainfall on Rill Erosion of Loess Slope
- Vol. 34, Issue 6, Pages: 8-13(2020)
- 作者机构：
  
  1. 西北农林科技大学水利与建筑工程学院, 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, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.06.002
  CLC： S157.1
- Published：2020
- 稿件说明：
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HE Yucong, ZHENG Haojie, HAN Jianqiao. Comparative Study on the Influence of Intermittent and Continuous Rainfall on Rill Erosion of Loess Slope[J]. 2020, 34(6): 8-13.
DOI：

HE Yucong, ZHENG Haojie, HAN Jianqiao. Comparative Study on the Influence of Intermittent and Continuous Rainfall on Rill Erosion of Loess Slope[J]. 2020, 34(6): 8-13. DOI： 10.13870/j.cnki.stbcxb.2020.06.002.

摘要

采用室内模拟降雨试验，对比了间歇性降雨与连续性降雨对黄土坡面细沟侵蚀的影响差异，量化了间歇性降雨相对于连续性降雨条件的试验误差，并评估该试验方法在坡面侵蚀模拟中的适宜性。结果表明：（1）低雨强（≤60 mm/h）时，对于间歇性降雨试验，坡面细沟产沙大幅降低，误差达-40.8%，伴随着沟宽、沟深和割裂度等形态指标的减小，误差介于-33%~-45%；产流误差较小，为0.4%。（2）高雨强（≥90 mm/h）时，产流产沙、细沟形态的各项指标误差均不大，为3%~12%，对试验结果影响相对较小。（3）在采用间歇性降雨试验方法时，建议采用高雨强试验条件（≥90 mm/h），才能准确模拟天然降雨的细沟侵蚀过程，且在高雨强时应控制间歇性降雨试验每一阶段的降雨历时，避免累积产沙量的持续快速增长而导致细沟侵蚀剧烈发展，误差进一步增大。由于土壤性质的区别，该试验结果在其他区域的适用性还有待深入研究。研究结果可为坡面细沟侵蚀的过程与机理研究提供技术支撑。

Abstract

Based on indoor simulated rainfall test

this study compared the influence of intermittent rainfall and continuous rainfall on rill erosion on loess slope

quantified and compared the experimental errors of intermittent rainfall relative to continuous rainfall conditions

and evaluated the suitability of this experimental method in slope erosion simulation. The results showed that: (1) At low rainfall intensity (≤60 mm/h)

for the intermittent rainfall test

the rill sediment production on the slope was significantly reduced with an error of -40.8%

and the error was between -33% ~ -45% along with the decreasing of ditch width

ditch depth and cleavage degree. The error of runoff production was small (0.4%). (2) When the rainfall intensity was high at 90 mm/h and 120 mm/h

the errors of various indexes of sediment and runoff production and rill morphology were all small

ranging from 3% to 12%

which had relatively little impact on the test results. (3) When the intermittent rainfall test method was used

it was suggested to adopt the high rainfall intensity test conditions (≥90 mm/h) to accurately simulate the rill erosion process of natural rainfall

and the rainfall duration of each stage of intermittent rainfall test should be controlled in case of high rain intensity

so as to avoid the continuous and rapid growth of accumulated sediment yield which leaded to the sharp development of rill erosion and further increase of error. Because of the difference of soil properties

the applicability of the test results in other areas needed further study. The results could provide technical support for the study of rill erosion process and mechanism.

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