Geological Hazard Risk Assessment of Landslide Geological Hazards in the Gushan Navigation and Hydropower Hub Reservoir Area

The geological disasters in the reservoir area of Gushan Navigation and Hydropower Hub are relatively dense. There are 52 medium-sized and above landslides in reservoir area with a length of 35 km, and the landslide density is relatively rare in similar projects. If the landslide in the reservoir area deforms and becomes unstable, it will cause major harm to residents and various buildings, dams, shipping, and ecological environment on and around the landslide. The research method combines mathematical statistics and information index. A database of landslide geological hazards in reservoir area is generated on GIS platform, and the landslide risk assessment model is constructed based on various indicators. In terms of data processing, the relative relationship between the reservoir water level and the elevation of each landslide front edge is counted, and the index values of various indicators such as the landslide stability, landslide geomorphic characteristics, and the influence of geological structures are extracted in GIS platform. In the construction of the model, the information index model for landslide risk assessment is constructed based on the indicators in landslide database. Through data processing and model operation, the quantitative risk grade results of 52 landslides in reservoir area are obtained, which reflect the hazard degree of each landslide to the disaster-bearing body. The research results can determine the risk level of each landslide, so as to deal with the higher risk landslides, reduce the cost of landslide treatment and resettlement, and provide technical support for engineering safety.