Abstract:Focusing on the Songpan section of the Chengdu-Lanzhou Railway as the study area, thestudy analyzed the distribution characteristics of debris flow based on field investigation and the re-gion's basic environmental geological conditions. Nine influencing factors were considered, includingelevation, slope, rainfall, lithology, seismic intensity, normalized difference vegetation index (ND-VI), distance from faults, source material reference value (HI), and watershed shape coefficient. Us-ing GIS technology, two different models-information volume and disaster entropy-were applied toclassify and calculate each assessment index layer, and the debris flow hazards were assessed. Results showed that, according to the information volume model, 87% of the total area in the study area wasclassified as moderate hazard or above, with 65% of the total area within the debris flow ditches classi-fied as moderate or higher hazard, covering 31 ditches. In the disaster entropy model, areas with mod-erate or higher hazard levels accounted for 81% of the total study area, and 80% of the total area with-in the debris flow ditches were classified as moderate or higher hazard, covering a total of 38 ditches.Compared to the actual distribution of hazards, the disaster entropy model provided results that werecloser to reality.
