Study On The Slope Soil Erosion Of Landslides In Wenchuan Earthquake Zone

Landslide, collapse, debris flow triggered by the Wenchuan earthquake, and the formation of landslide generated a lot of soil erosion which seriously threatens the life and property of people. Adopting field investigation in Wenchuan earthquake zone, we found that the earthquake-induced landslide have loose structure, steep slope, less vegetation cover, and the large amounts of sediment produced by rainfall or surface runoff is the main source of new earthquake erosion. In this paper, the Wenchuan earthquake landslide as the object of study, Wenchuan County as the research region. In this paper, the Wenchuan earthquake landslide as the object of study, Wenchuan County as the research region. Through field survey, site survey and statistical analysis methods, study on the relationship between soil erosion of landslides and runoff in Wenchuan earthquake zone of which main research results are as follows:Research on the estimation of slope runoff in earthquake landslide. Based on remote sensing images after the earthquake, combined with field photos and terrain elevation, extracting typical catchment area above the landslide accumulation body Analysis of the process of accumulation body strength catchment slope, combined with historical rainfall over the same period, estimates the slope runoff of landslide accumulation.Research on the estimation of volume of earthquake landslide erosion gully. the object of study selected by Fieldwork in the earthquake zone are measured by three-dimensional laser scanner measurements. The establishment of a way to estimate landslide erosion gully volume by3D laser scannerincludes Using the least squares fit of the original curve slope, comparing the data of bottom of the groove and the side of the ditch to measure out the volume.Contrasting with the traditional method,the estimation of12landslide accumulations have maximum relative error of20.80%and smallest relative error of1.80%.The relationship with the results of the three is obtained by analysis,which are the volume of erosion gully of landsliade accumulation using the above method,the horizontal projection area of landslide mass according to remote sensing image and the length of erosion gully through field survey.The model about the horizontal projection area and the volume of erosion gully is constructed.Slope erosion of landslide accumulation estimation model.Based on the measuring results and analysis of coupling between ersion and slope runoff in landslide accumulation which is generalized,the model is builded.7landslide accumulation is selected for model validation.The result shows that the model with better accuracy can provide theoretical support for the earthquake landslide mass-induced erosion in Wenchuan earthquake zone.