SUSCEPTIBILITY EVALUATION OF GEOLOGICAL HAZARD BY COUPLING GREY RELATIONAL DEGREE AND ANALYTIC HIERARCHY PROCESS: A CASE OF CHONGTOU TOWN, YUNHE COUNTY, ZHEJIANG PROVINCE

To address the lack of historical disaster data in high-precision geological disaster research,we proposed a geological disaster susceptibility evaluation model. This model couples grey relational degree(GRD) and analytic hierarchy process(AHP). We obtained and classified the states of 9 factors by engineering survey and remote sensing interpretation according to the disaster mechanism. We analyzed the relational degrees between 9 factors and historical disasters and constructed three discriminant matrices of AHP based on the values,the index scale values,and the ranking of the relational degrees,respectively. Three GRD-AHP coupling models(G-A1,G-A2,and G- A3) and a classical GRD model(G)were established. The coupling model G-A1 shows a more reasonable susceptibility index distribution,a higher prediction accuracy,and a larger high-susceptibility intensity index. This new model is recommended as the evaluation model of geological hazard susceptibility in Chongtou Town and southwest Zhejiang Province. This work provides an effective coupled model for high-precision geological disaster research.