水土保持通报2025，Vol.45Issue(4)：1-9,197,10.DOI:10.13961/j.cnki.stbctb.2025.04.035
覆沙黄土坡面沙层滑移对水分变化的响应机理
Mechanism of sand-layer sliding induced by water content changes on sand covered loess slopes
摘要
Abstract
[Objective]The effects of sand cover thickness,rainfall intensity,and slope on the formation of water flow,sediment yield,moisture change,and slip in a binary sand and soil structure on loess slopes were analyzed to inform the control and prevention of soil erosion in the wind-water complex erosion area.[Methods]Quantitative analysis was conducted based on laboratory rainfall simulation experiments,through which the processes of runoff,sediment production,erosion,and sliding,as well as spatiotemporal variations in water content on sand-covered loess slopes,were investigated.[Results]① Sliding phenomena on sand-covered loess slopes were more likely to occur under prolonged rainfall.Moreover,the time of sliding occurrence was delayed on slopes with thicker sand cover,whereas increased rainfall intensity and steeper slopes accelerated sliding.Sediment yield from sliding increased with higher rainfall intensity and steeper slope.② The variation rate of soil water storage was collectively influenced by sand thickness,rainfall intensity,and slope gradient,and increases significantly with an increase in these three factors.③ The variation in sand saturation could be divided into three stages:rapid increase,stable state,and renewed growth.④ Variations in soil saturation indicated that the critical conditions for sliding were influenced by sand thickness,rainfall intensity,and slope gradient.[Conclusion]Sliding on sand-covered loess slopes is substantially influenced by soil saturation,which is controlled by sand thickness,rainfall intensity,and slope gradient.关键词
覆沙黄土坡面/滑移/风水复合侵蚀/坡面侵蚀产沙/黄土高原Key words
sand-covered slopes/sliding/wind-water complex erosion/slope erosion and sediment yield/loess plateau分类
农业科技引用本文复制引用
韩奇隆,吕博,陈力..覆沙黄土坡面沙层滑移对水分变化的响应机理[J].水土保持通报,2025,45(4):1-9,197,10.基金项目
国家自然科学基金"覆沙坡面降雨侵蚀过程地下—地表耦合机理与模拟研究"(12272186) （12272186）
