Mechanism of sand-layer sliding induced by water content changes on sand covered loess slopes

Han Qilong; Lü Bo; Chen Li

doi:10.13961/j.cnki.stbctb.2025.04.035

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Mechanism of sand-layer sliding induced by water content changes on sand covered loess slopes

Experimental Researches

- Mechanism of sand-layer sliding induced by water content changes on sand covered loess slopes
- Bulletin of Soil and Water Conservation Vol. 45, Issue 4, Pages: 1-9(2025)
- 作者机构：
  
  1.南京信息工程大学水文与水资源工程学院，江苏南京 211800
  2.水利部水文气象灾害机理与预警重点实验室，江苏南京 211800
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2025.04.035
  CLC： S157.1
- CSTR：32312.14.stbctb.2025.04.035.
- Received：08 February 2025，
  
  Revised：2025-05-19，
  
  Published：20 August 2025
- 稿件说明：
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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.

Han Qilong, Lü Bo, Chen Li. Mechanism of sand-layer sliding induced by water content changes on sand covered loess slopes [J]. Bulletin of Soil and Water Conservation,2025,45(4):1-9.
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. DOI： 10.13961/j.cnki.stbctb.2025.04.035. CSTR： 32312.14.stbctb.2025.04.035..

Han Qilong, Lü Bo, Chen Li. Mechanism of sand-layer sliding induced by water content changes on sand covered loess slopes [J]. Bulletin of Soil and Water Conservation,2025,45(4):1-9. DOI： 10.13961/j.cnki.stbctb.2025.04.035. CSTR： 32312.14.stbctb.2025.04.035..

摘要

目的

分析黄土坡面上覆沙厚度、降雨强度和坡度对沙土二元结构中产流产沙、水分变化及滑移的影响，旨在为风水复合侵蚀区的水土流失治理与预防提供科学依据。

方法

基于室内模拟降雨试验，观测产流、产沙、侵蚀滑移以及水分时空变化过程，定量分析覆沙厚度、雨强和坡度对水分变化及覆沙黄土坡面滑移的影响。

结果

①覆沙黄土坡面经历较长历时降雨易发生滑移。覆沙厚度的增加会延缓滑移的发生，而降雨和坡度的增加则使其提前。滑移产沙量随降雨强度和坡度的增加而增加。 ②土壤水蓄量变化率受覆沙厚度、降雨强度和坡度的共同影响，并随这三者的增加而显著增大。 ③沙层饱和度的变化过程可以分为快速增加、稳定状态和再次增长3个阶段。 ④土体饱和度的变化表明，滑移发生的临界条件受沙层厚度、降雨强度和坡度等因素的影响。

结论

覆沙黄土坡面沙层滑移受到饱和度的影响，而土壤的饱和度受到沙层厚度、降雨强度和坡度等因素的共同影响。

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

Keywords

references

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