RISK ASSESSMENT OF DEBRIS FLOW IN NIUJUANGOU IN PENGZHOU CITY BASED ON FUZZY ANALYTIC HIERARCHY
Niujuangou is a multi-stage debris flow gully.The accumulation fan at the gully mouth shows that there have been many large-scale debris flows in the history of the gully,and small-scale debris flows have also occurred many times since the Wenchuan earthquake,which has brought potential threat to the construction of the proposed Pengwen Expressway.Based on the on-site geological investigation,combined with UAV images and remote sensing images to determine the basic characteristics of debris flow gully,the fuzzy analytic hierarchy process is used to construct the risk assessment model of debris flow.The topography,provenance and triggering conditions are selected as the main factors and 10 secondary factors are selected to evaluate the risk of debris flow.The results showed that the evaluation grades of Niujuangou,Xiaoniujuangou,Huilonggou,Yanzidonggou and Henghegou were high hazard,while the evaluation grades of Lianshangou,Feishuiyangou,Machanggou,Shiliangzigou and Manbangou were mildly dangerous.The evaluation results were in good agreement with the actual investigation results of debris flow.The results can provide a scientific basis for disaster prevention and mitigation of Niujuangou debris flow in Longmenshan Town,Pengzhou City and the construction of Pengwen Expressway project.
Niujuangou in Pengzhou citydebris flowrisk assessmentanalytic hierarchy processfuzzy comprehensive evaluation
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