Based on the monitoring data of rainfall,soil water content and cumulative slope displacement in the typical landslide risk area of Yushu,the Darcy-Richards equation was used to simulate the soil water content under different slope positions,and explore the characteristics of potential landslide displacement and soil water change under precipitation conditions.The results show that the soil moisture content at different soil depths in the upper and lower slopes of the study area is consistent with the trend of rainfall changes,and the fluctuation of soil moisture content changes decreases with the deeper depth of the soil layer.In the months with high rainfall,the soil moisture content of the shallower soil layer was higher than that of the deeper soil layer;in the months with low rainfall,the soil moisture content of the soil layer in the upper slope was 30 cm＜60 cm＜120 cm＜90 cm,and that of the soil layer in the lower slope was 60 cm＞30 cm＞120 cm＞90 cm.The changes of the vertical and horizontal displacements of the lower slope were higher than that of the upper slope,and the maximum vertical displacement of the upper slope was higher than that of the upper slope.The vertical and horizontal displacements of downslope were higher than those of upslope,and the maximum vertical displacement of upslope appeared and ended earlier than the maximum horizontal displacement;the vertical and horizontal displacements of downslope firstly showed an upward trend,reached the cumulative amount of the maximum vertical displacement,and then declined rapidly.The inversion results of soil hydraulic parameters at different depths found that the saturated water content and parameter α of the soil decreased significantly with the increase of soil depth,while the saturated hydraulic conductivity Ks of the soil increased with the increase of soil depth,and the parameter n of the soil was basically stable.The results of the study can provide scientific and technological support for landslide forecasting and early warning and risk prevention and control in the plateau area.
Potential landslide displacementSoil water contentDisplacementSoil hydraulic parameters
NETL
NSTL
维普
万方数据
