Geohazard Susceptibility Mapping Considering Spatial Heterogeneity: A Case Study of Xide County in Sichuan Province

Abstract Spatial heterogeneity is closely related to the development pattern and spatial distribution of geohazard, which significantly affects the result of geohazard susceptibility mapping. In view of this, taking Xide County in Sichuan Province as an example, this paper proposes a semi-quantitative zoning scheme based on the hazard-pregnant environment and hazard density to divide the study area into four blocks. And the effect of zoning is evaluated by utilizing the ecological detector and risk detector of Geodetector. On this basis, based on the data fluctuation weighted method, the selecting and weighted of evaluation factors were carried out in different blocks, and the mapping of the susceptibility of each block was completed by using ARCGIS software. The AUC value, precision rate, recall rate and coefficient of heterogeneity were used as evaluation parameters to compare the reasonableness of the susceptibility mapping before and after zoning. The results show that: Solving the problem of spatial heterogeneity can effectively improve the accuracy and reliability of susceptibility mapping. The analysis of susceptibility mapping relies on different evaluation parameters, and the coefficient of heterogeneity may play an important role in further improving the accuracy and reliability of the mapping results. The study contributes to the refined development of regional geohazard susceptibility mapping, and the proposed methodology is highly generalizable and replicable.