Influence of Natural Rainfall Pattern Variation on Interrill Erosion

WU Lin; ZHANG Fengbao; SHEN Nan; LI Xuantian; LIU Ying; HE Qilin; YANG Mingyi

doi:10.13870/j.cnki.stbcxb.2023.04.005

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Influence of Natural Rainfall Pattern Variation on Interrill Erosion

更新时间：2025-03-12

- Influence of Natural Rainfall Pattern Variation on Interrill Erosion
- Vol. 37, Issue 4, Pages: 31-37(2023)
- 作者机构：
  
  1. 中国科学院教育部水土保持与生态环境研究中心, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所, 陕西杨凌,712100
  3. 中国科学院大学,北京,100049
  4. 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：10.13870/j.cnki.stbcxb.2023.04.005
  CLC： S157.1
- Published：2023
- 稿件说明：
移动端阅览
WU Lin, ZHANG Fengbao, SHEN Nan, et al. Influence of Natural Rainfall Pattern Variation on Interrill Erosion[J]. 2023, 37(4): 31-37.
DOI：

WU Lin, ZHANG Fengbao, SHEN Nan, et al. Influence of Natural Rainfall Pattern Variation on Interrill Erosion[J]. 2023, 37(4): 31-37. DOI： 10.13870/j.cnki.stbcxb.2023.04.005.

摘要

通过野外微小区原位观测试验

基于降雨过程中降雨的集中时段对2017—2021年34次侵蚀性降雨雨型进行划分

系统分析雨型变化对黄土坡面细沟间侵蚀的影响及坡度效应。结果表明:研究区以前期型降雨为主

占总场次的52%

中期型和后期型降雨各占24%。中期型降雨对总产流量的贡献(25.56%±3.83%)显著低于前期型(36.70%±2.07%)和后期型(37.74%±4.01%)(p<0.05)。不同雨型场均径流量依次为后期型>中期型>前期型

后期型和中期型降雨显著高于前期型。而降雨的场均产沙量则表现为后期型>前期型>中期型

且后期型降雨显著高于中期型(p<0.05)。雨型对细沟间侵蚀影响的坡度效应变化不明显

但随着坡度增大

后期型降雨的场均径流量和产沙量均大于前期型和中期型

说明后期型降雨的产流产沙对坡度变化相对较为敏感。次降雨径流量、坡度和降雨参数组合与次降雨产沙非线性拟合中

方程决定系数后期型(0.939~0.942)>中期型(0.776~0.845)>前期型(0.220~0.537)

说明区分雨型模拟可提高模拟精度。

Abstract

Through in situ observation experiment in the field micro-plots

the 34 erosive rainfall patterns from 2017—2021 were classified based on the concentrated periods of rainfall during the rainfall process

and the effects of rainfall pattern variation on the interrill erosion on loess slopes and slope effects were systematically analyzed. The results showed that the advanced rainfall pattern was dominant

accounting for 52% of the total rainfall

while the intermediate rainfall pattern and delayed rainfall pattern each accounted for 24%. The contribution of intermediate rainfall pattern to total runoff yield (25.56%±3.83%) was significantly lower than that of the advanced rainfall pattern (36.70%±2.07%) and delayed rainfall pattern (37.74%±4.01%) (p<0.05). The average runoff yield of different rainfall patterns was in the order of delayed rainfall pattern > intermediate rainfall pattern > the advanced rainfall pattern

and the delayed rainfall pattern and intermediate rainfall pattern was significantly higher than that of advanced rainfall pattern. The average sediment yield of different rainfall patterns was in the order of delayed rainfall pattern > advanced rainfall pattern > intermediate rainfall pattern. The rainfall of the delayed rainfall pattern was significantly higher than that of the intermediate rainfall pattern (p<0.05). The variation of slope effect of rainfall pattern on the effect of interrill erosion is not obvious

but with the increase of slope

the average runoff and sediment yield of delayed rainfall pattern were larger than that of advanced and intermediate rainfall pattern

indicating that the sediment yield of delayed rainfall pattern was relatively sensitive to the variation of slope. In the nonlinear fitting models of runoff

slope and rainfall parameter combination and sediment yield

the equation decision coefficients were delayed rainfall pattern (0.939~0.942) > the intermediate rainfall pattern (0.776~0.845) > the advanced rainfall pattern (0.220~0.537)

indicating that the classification of rainfall pattern could improve model simulation accuracy.

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