Landslide susceptibility using weights-of-evidence approach and multi-source data in Longzhong ecologically vulnerable area：a case study of Tianshui City北大核心CSCD

Analysis and assessment of landslide susceptibility using 3S technology and mathematical statistical model is still the current hot topics. It is very important for selection of unit and factor and model to the landslide susceptibility assessment reasonably. Tianshui City is selected as the study area which is in the typical regions of Longzhong ecologically vulnerable area. Based on the weights-of-evidence approach（WOE）and two kinds of assessment units（grid-unit，GU，slope-unit，SU）and also two resolutions（30 m，10 m），a total of four differ? ent data sets（GU30，SU30，GU10，SU10）is established. Then quantitative analysis and contrast assessment di? vision of the loess landslide susceptibility in the study area though selected four kinds of thirteen factors. The re? sults show that stratum lithology，altitude，relief amplitude，roughness and slope are the key control factors of landslide development in the area. The geological factors and topographic factors control and determine the for? mation and development of the landslides in study area. The susceptibility value of stratum lithology is the high? est value. Statistical analysis of susceptibility division is carried out according to the point and area of landslide respectively. The landslide ratio shows that the division based on the slope-unit is higher than that of the grid-unit. Landslide susceptibility area in highest division based on the slope-unit and 10m high resolution is account? ed for the highest. Therefore，it has higher precision in landslide susceptibility analysis and assessment that us? ing the slope-unit and high resolution data. The landslide susceptibility result is consistent with the actual land? slide development in the study area. The division results can also be used for the landslide prevention and control and national spatial planning in the study area. © 2023 Chinese Journal of General Practitioners. All rights reserved.