Landslide survey based on three-dimensional resistivity inversion:A case study of the Xuelang Mountain scenic spot,Wuxi,China
Effectively identifying the stratigraphic and landslide structures in landslide-prone areas is significant for disaster prevention and mitigation.By investigating the landslides in the Xuelang Mountain scenic spot in Wuxi,this study analyzed the differences be-tween two-and three-dimensional inversion using the high-density resistivity method.Accordingly,this study explored methods for elimi-nating the banded effect in the three-dimensional inversion,performed three-dimensional resistivity inversion under the constraints of high-precision surface elevation data and borehole-derived prior information,and constructed a three-dimensional geological model for the study area.The results indicate that three-dimensional resistivity inversion enjoys distinct advantages in complex landslide surveys.The banded effect can be effectively suppressed by optimizing the grid spacing,damping coefficient,and filter parameters for inversion.Furthermore,the terrain-induced impacts and the multiplicity of solutions of the inversion can be significantly reduced using constraints of refined terrain data and prior information,thus improving the resolutions of stratigraphic boundaries and landslide structures.Through three-dimensional resistivity inversion and geological modeling,this study determined the three-dimensional stratigraphic structure,a-long with the spatial distributions of the landslide bodies and sliding surfaces,and investigated landslide mechanisms,providing impor-tant data for the survey and control of landslides in the study area.
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