Characteristics analysis and risk assessment of landslide-debris flow disaster chain——Taking Majingzi Gully,Shimian County,western Sichuan as an example
The topography and geological structure in western Sichuan are complex,and the landslide-debris flow disaster chain is easy to develop.The main disasters in the disaster chain are transmitted to the sec-ondary disasters step by step,which further enhances the risk of disasters.In order to study the characteris-tics and risk of the landslide-debris flow disaster chain,the one in Majingzi Gully,Sichuan Province was taken as the research object.The risk degree analysis of landslide and debris flow in this region was carried out respectively,and the characteristics of the regional landslide-debris flow disaster chain were analyzed and risk assessment was carried out.Firstly,the AHP model was constructed to analyze the landslide risk,and the vulnerability grade calculation model was used to calculate the landslide vulnerability.Then the risk degree of debris flow was estimated by the index of debris flow danger zone,and the vulnerability of debris flow disaster loss was obtained according to the regional statistical data.Finally,according to the multi-dis-aster risk theory formula,the risk degree of the regional landslide and debris flow disaster chain was calcu-lated,and the risk assessment of disaster chain was carried out.The results show that Majingzi Gully land-slide-debris flow disaster chain is a middle risk area,and the evaluation results are consistent with the field survey results,which verifies the rationality and feasibility of the disaster chain analysis and evaluation method system based on the multi-disaster risk theory combined with various models.The analysis of the risk degree of Majingzi Gully disaster chain provides theoretical basis for similar research.
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