Weight calculation of risk factors for debris flow in earthquake zone based on combination weighting method

Le résumé fourni par la source

It is of great practical value to study the risk assessment of debris flow in the earthquake zone for ensuring people's safety and constructing key projects.Taking six debris flows in the earthquake area as examples, this paper calculates the weight of each Impact factor by using the analytic hierarchy process (namely subjective weighting method) and gray relational degree method (namely objective weighting method), then the weights of subjective and objective are calculated and dealt with using combination weighting, and the highest proportion of weight are annual rainfall and seismic intensity respectively.Debris flow disaster has a serious impact on human life.Therefore, the research to debris flow disaster has important guiding significance for preventing and mitigating disaster [1].Many scholars at home and abroad have also studied the risk assessment of debris flow [2,3].At present, the objective weight assignment method and subjective weight assignment method are the most common methods of determining the dangerous weight of debris flow, but the combination weighting method which combines the two methods is very scarce.In this paper, we will take 6 debris flows in the earthquake area as the research object, conduct on-site geological survey, calculate the weight of each evaluation factor separately by using analytic hierarchy process and gray relational degree method, and calculate the combined weight. The selection of impact factors of debris flowBased on the obtained data of the study area, taking the characteristics of the study area in the earthquake area into consideration, the risk factors of the study area are determined as the nine factors, the debris flow scale, the watershed area and the occurrence frequency of the debris flow, the cutting density of watershed, maximum relative height difference of the watershed, annual rainfall, main channel length, population density and seismic intensity.

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