Landslide Susceptibility Assessment at the Xiushui Area (China) Using Frequency Ratio Model

Landslide hazards are one of the most dangerous natural disasters all over the world. Landslide susceptibility assessment is useful for land use planners, and it can give the government some guide of management. In the current study, Frequency Ratio model combined with geographic information system are used in the Xiushui area. Firstly, landslide inventory map in Xiushui area come from interpretation of satellite images and field survey data. Then 214 (75%) landslides were randomly selected as sample data, 72 (25%) landslides were selected as verification data. Secondly, the relationship between landslide and influencing factors was described 10 factors were applied in the model including slope, slope elevation, TWI, SPI, LS, distance to river, distance to fault, lithology map, rainfall. By using these factors, corresponding parameters in FR model simulation were selected. The results show that the high risk and very high risk of landslide areas is present/appears for 48.2% of the region. In the course of model validation, the results were validated using ROC curve. The AUC of Frequency ratio model was 80.5%. Therefore, the landslide susceptibility index map of Xiushui is valuable for decision maker in landslide prone area.