Geological Disaster Risk Assessment Based on GIS Technology: Taking Kaiping Township of Beichuan County as An Example

Abstract:

An effective way for geological disasters prevention and control is to carry out geological disaster zoning and risk research and further delineate high risk areas of geological disasters to save prevention and control costs and achieve the effect of risk assessment. With the complex geology and geomorphology, all kinds of geological disasters developed in Kaiping County of Beichuan. On the basis of detailed geological disaster investigation, this paper intends to make the risk assessment on the geological disaster in this area. Taking the factors of single landslide’s volume, area, height difference, distance to the river, lithology and deformation signs as the analysis units, the landslide hazard zoning can be realized in a large-scale range, and the maps of the geological hazards risk and the geological hazards susceptibility are made. Based on the interpretation of remote sensing image, original data query and the field investigation, the distribution map of the land types in the study area around Kaiping Township is made. Combined with the danger and vulnerability of a single landslide and in this region, a comprehensive map of the surrounding regions of Kaiping Township is made. The effective geological disaster risk zoning of the study area is completed.

Key words:geological disaster; GIS technology; risk management; analysis unit; slope stability; risk zoning; Kaiping Township of Beichuan