In the southeast of Jilin Province, the debris flows mostly occurred in the low mountain and hilly area where the altitude is lower than 1 000 m, and are always associated with rainstorms. The physical geographical features of the debris flow-prone areas in Jilin Province were analyzed based on the GIS (Geographic Information System) platform, and the distribution of the debris flow prone areas in Jilin Province was drawn. The elevation, slope, soil types and land uses in the study area were evaluated by the experts, and the self-organizing cluster analysis and grey cluster method were used to classify the debris flows. Debris flow events were divided according to the date of rainfall (J1), days of cumulative rainfall (J2), cumulative rainfall in 7 days before debris flow (J3), height (J4) , slope (J5), soil type (J6) and land use (J7). Finally, the events were divided into three categories, and the zoning map of rainfall induced debris flows in Jilin Province was drawn, which provides a reference for managing geological disasters.
Key words
cluster analysis /
debris flow /
debris flow prone area /
physical geographical features /
rainfall characteristic
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Footnotes
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Funding
Science and Technology Department of Jilin Province Key Scientific and Technological Projects, No.20130206088SF ;National Natural Science Foundation of China, No.51379088
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