Effect of Pre-period Water Content on Freeze and Thaw of Slope Under Simulated Rainfall

DUAN Jinxiao; LI Peng; LI Zhanbin; REN Zongping; WANG Tian; TANG Shanshan; SU Yuanyi; CHENG Shengdong

doi:10.13870/j.cnki.stbcxb.2017.06.012

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Effect of Pre-period Water Content on Freeze and Thaw of Slope Under Simulated Rainfall

更新时间：2025-03-12

- Effect of Pre-period Water Content on Freeze and Thaw of Slope Under Simulated Rainfall
- Vol. 31, Issue 6, Pages: 73-78(2017)
- 作者机构：
  
  西安理工大学西北旱区生态水利工程国家重点实验室培育基地,西安,710048
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2017.06.012
  CLC： S157.1
- Published：2017
- 稿件说明：
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DUAN Jinxiao, LI Peng, LI Zhanbin, et al. Effect of Pre-period Water Content on Freeze and Thaw of Slope Under Simulated Rainfall[J]. 2017, 31(6): 73-78.
DOI：

DUAN Jinxiao, LI Peng, LI Zhanbin, et al. Effect of Pre-period Water Content on Freeze and Thaw of Slope Under Simulated Rainfall[J]. 2017, 31(6): 73-78. DOI： 10.13870/j.cnki.stbcxb.2017.06.012.

摘要

为了探究不同前期含水量条件下冻融作用对坡面降雨侵蚀的影响，采用室内冻融和人工模拟降雨方法研究了不同含水量条件下冻融坡面与未冻融坡面的降雨侵蚀特征。结果表明：黄土坡面的产流时间随前期含水量增大呈先增大后减小的规律，冻融作用使黄土坡面产流时间滞后，其中含水量为20%的坡面经过冻融作用滞后62.50%，最为明显。在产流过程中，20%含水量的冻融坡面比未冻融坡面产流总量低9.14%存在极显著性差异（P＜0.01）。在产沙过程中，20%和25%含水量的冻融坡面比未冻融坡面产沙总量减小28%，存在极显著性差异（P＜0.01）；20%和25%含水量的冻融坡面与未冻融坡面的可蚀性相差最明显。综上可以得出含水量为20%时冻融作用对坡面产流时间和产流过程影响最显著；含水量为20%和25%时冻融作用对坡面产沙过程和可蚀性K值影响最显著。含水量为20%时产沙量最小，可蚀性最低，可将20%作为黄土最优含水量。

Abstract

In order to explore the effect of freezing and thawing on the rainfall erosion on the slope

a freezing and thawing experiment was conducted in Xi'an

and the characteristics of rainfall erosion on slopes with different water content were studied in the experiment. The results showed that the emergence flow time increased first and then decreased with the increase of the initial water content

and the emergence flow time was delayed by freezing and thawing

specifically

the lag was up to 62.50% when the water content was 20%. The runoff flow on the completed thawed slope with 20% water content was 9.14% lower than that of unfrozen slope（P＜0.01）；the sediment yield on the completed thawed slope with 20% and 25% of the water content decreased by 28% than that of the unfrozen slope（P＜0.01）.In summary

it can be concluded that the effect of freezing and thawing on the runoff time and runoff process was the most obvious when the water content was 20%

while the effect of freezing and thawing on the sediment yield and erosive K value was the most obvious when the water content was 20% and 25%. When the water content was 20%

the sediment yield was the smallest and the erosibility was the lowest

hence

20% can be used as the optimal water content of loess.

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