Landslide Susceptibility Assessment based on GIS Technology

-- Take Beichuan Qiang Autonomous County as an Example

Abstract

Landslides, as a typical geological hazard, pose a serious threat to the safety of people's lives and property in China. Conducting geological hazard susceptibility assessments plays a crucial role in formulating scientific disaster prevention and mitigation plans. With the development of GIS technology, its application in geological hazard evaluation has become increasingly widespread. This study focuses on Beichuan Qiang Autonomous County in Mianyang City, Sichuan Province, a region in China with frequent landslide occurrences. Slope angle, aspect, elevation, hydrological systems, distance from faults, and maximum NDVI values were selected as evaluation indicators for landslide susceptibility. Using ArcGIS's powerful spatial analysis capabilities and information modeling methods, we conducted a landslide susceptibility zoning analysis and completed the evaluation. The results show that high-susceptibility areas cover 884.1447 km² (29% of the total area), medium-susceptibility areas cover 811.737km² (26%), and low-susceptibility areas cover 851.4711 km² (28%). Non-susceptible areas total 522.3807 km² (17%). The evaluation results align well with actual conditions, providing a theoretical foundation for landslide early warning, forecasting, and prevention efforts in the region.