The assessment of geohazard danger in Wenchuan County based on RS and GIS

Abstract：The assessment of geohazard danger constitutes an important basis for the work of disaster prevention and mitigation. In this paper, the author collected the remote sensing images of IKONOS, topographic maps and field survey data, and extracted the evaluation factors of rock fall and landslide based on remote sensing information extraction technology and GIS Spatial Analysis. Then the factor scores were determined by information method and calculated susceptibility of rock fall and landslide. At last, the new danger calculation method of rock fall and landslide was put forward, and the rock fall hazard zonation map and landslide hazard zonation map were drawn. The results show that the new rock fall and landslide risk assessment method can reflect the risk degree of geological disasters in the study area. The method is feasible and the results are reasonable. This achievement has provided a useful idea for large-scale regional geological hazard study.