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Debris flow susceptibility evaluation is the prerequisite for risk assessment, important basis for disaster prevention and mitigation work. Based on the field investigation of the debris flow disaster in the middle and lower reaches of the Bailong River, four evaluation factors of aspect, lithology, structure density and seismic density were selected based on the characteristics of debris flow source development. Using deterministic model and gray relation method was used to evaluate the sensitivity of debris flow source. Finally, the factors of source sensitivity, degree of erosion on the slop surface, grove gradient and gully density were selected from the top two terrain and provenance conditions of debris flow. The AHP model was used to analyze the regional debris flow susceptibility Zoning. The results showed that: 59.06% of the debris flow source distribution and 52.03% of the debris flow ditch are located in the high-prone area, 85.62% of the debris flow source distribution and 81.76% of the debris flow ditch is located in the area above the medium-prone area, and the ratio of debris flow area and the source area b/a also increases. It shows that the susceptibility calculation of debris flow based on the analytic hierarchy process is in good agreement with the actual situation, and the result is more ideal. The evaluation results can provide reference for disaster prevention and mitigation in the project construction and town planning in the region.

Susceptibility Evaluation of Debris Flow in Middle and Lower Reaches of Bailong River Based on Source Features