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Development of a region-partitioning method for debris flow susceptibility mapping

Journal of Mountain Science 2021年第5期18卷 1177-1191页

作者： QIAO Shuang-shuang QIN Sheng-wu SUN Jing-bo CHE Wen-chao YAO Jing-yu SU Gang CHEN Yang NNANWUBA Uzodigwe Emmanuel College of Construction Engineering Jilin UniversityChangchun 130026China

Debris flow susceptibility mapping(DFSM)has been reported in many studies,however,the irrational use of the same conditioning factor system for DFSM in regional-scale has not been thoroughly *** this paper,a region-partitioning method that is based on the topographic characteristics of watershed units was developed with the objective of establishing multiple conditioning factor systems for regional-scale ***,watershed units were selected as the mapping units and created throughout the entire research *** topographical factors,namely,elevation,slope,aspect and relative height difference,were selected as the basis for clustering watershed *** k-means clustering analysis was used to cluster the watershed units according to their topographic characteristics to partition the study area into several ***,the information gain ratio method was used to filter out superfluous factors to establish conditioning factor systems in each region for the subsequent debris flow susceptibility ***,a debris flow susceptibility map of the whole study area was acquired by merging the maps from all *** of Yongji County in Jilin Province,China was selected as a case study,and the analytical hierarchy process method was used to conduct a comparative analysis to evaluate the performance of the region-partitioning *** area under curve(AUC)values showed that the partitioning of the study area into two parts improved the prediction rate from 0.812 to *** results demonstrate that the region-partitioning method on the basis of topographic characteristics of watershed units can realize more reasonable regional-scale ***,the developed region-partitioning method can be used as a guide for regional-scale DFSM to mitigate the imminent debris flow risk.

关键词： Debris flow susceptibility regionpartitioning method Multiple conditioning factor systems Watershed units Topographic characteristics Yongji county

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