A Comparative Study on Debris Flow Hazard Assessment Based on Information Volume and Disaster Entropy:a Case Study of Songpan Section of Chengdu-Lanzhou Railway
Focusing on the Songpan section of the Chengdu-Lanzhou Railway as the study area,the study 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,including elevation,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 to classify 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 was classified 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 were closer to reality.
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维普
