Landslide geological hazard assessment based on the I-CF model of Dege County in Sichuan Province

Abstract

This study focuses on Dege County as the research area, and carries out terrain analysis and processing with 7m DEM. A landslide hazard database for Dege County is establishing using relevant survey data. With the support of GIS technology, this research employs the information quantity model (I), analytic hierarchy process model (AHP), and deterministic coefficient model (CF) coupling to evaluate the hazard sensitivity within the study area based on seven selected indicators: mic peak acceleration, fault zone, water system, slope, slope direction, elevation, and lithology. Subsequently, an assessment of hazard is conducted for the entire county domain by considering factors related to landslide activity frequency. The results are categorized into four zones: high risk, relatively high risk, moderate risk, and low risk. The high and relatively high-risk zones collectively cover 2.23% of the total area, with landslides accounting for 42% of the overall hazards. The evaluation results align well with the actual survey findings, providing technical support for predicting, forecasting, and implementing safety measures against landslide disasters in areas that without field investigation. Furthermore, it can serve as a theoretical guide and technical reference for the risk assessment of landslide hazard in other regions.

Keywords

• landslide
• gis
• hazard assessment
• certainty factor method
• dege county