水土保持学报2017，Vol.31Issue(6)：73-78,175,7.DOI:10.13870/j.cnki.stbcxb.2017.06.012
模拟降雨下前期含水量对冻融坡面产流产沙过程的影响
Effect of Pre-period Water Content on Freeze and Thaw of Slope Under Simulated Rainfall
摘要
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.关键词
前期含水量/冻融/模拟降雨/可蚀性Key words
pre period water content/freezing thawing/simulated rainfall/erosion分类
农业科技引用本文复制引用
段金晓,李鹏,李占斌,任宗萍,王添,汤珊珊,苏远逸,程圣东..模拟降雨下前期含水量对冻融坡面产流产沙过程的影响[J].水土保持学报,2017,31(6):73-78,175,7.基金项目
国家自然科学基金重点项目(41330858) （41330858）
国家自然科学基金面上项目(41471226) （41471226）
国家重点研发计划项目(2016YFC0402404) （2016YFC0402404）
