Risk assessment and its influencing factors analysis of geological hazards in typical mountain environment

Abstract

Fujian Province is a typical mountainous environment, where regional geological hazards occur frequently, posing serious threats to the safety of local residents’ lives and property and regional ecological security. Accurately revealing the risk of geological hazards in Fujian Province have important guiding significance for the local government to develop targeted prevention strategies. This study selects 8 indicators including elevation, slope, normalized difference vegetation index (NDVI), lithology, land use type, average annual precipitation, distance from rivers and distance from faults to construct an evaluation index system, and reveal the spatial pattern and its influencing factors of the risk of geological hazards in Fujian Province based on the information quantity model and geodetector method. The results showed that the geological hazards risk of mountainous areas in Fujian Province have an overall trend of high in the southeast and low in the northwest, and a characteristic of significant spatial agglomeration. The proportion of different levels of geological hazard risk is showed as that medium risk > medium-high risk > medium-low risk > high risk > low risk, among which, the combined area with medium and medium-high risk accounts for 76.06%. The occurrence of geological hazards in Fujian Province is the result of the combined effects of the natural environment and human activities, and the night light intensity, elevation, slope, and distance from rivers are the main influencing factors causing geological hazards. In addition, The combination of dominant factors conducive to inducing geological hazards are found, which can provide scientific basis for the formulation of regional geological disaster prevention strategies.