The flash flood prevention work has become an important fundamention work of water conservancy disaster prevention and reduction in China. Considering the sudden, strong and destructive characteristics of flash flood disaster, new requirements are put forward for the spatial analysis, modeling and optimization of GIS data. This paper takes the upper of Le'an River in Wuyuan County, Jiangxi Province as the study area, using GIS spatial analysis, modeling and optimization method to study the distribution of flash flood disaster, optimization the flash flood station network。According to the definition of disaster risk posed by the United Nations Department of Humanitarian Affairs, this study defines the risk of flash flood disaster as a product of hazard and vulnerability. The hazard model is based on the logistic regression model, and the vulnerability model adopts the transformation assignment function. Finally, the results of the risk assessment in upper Le'an River are obtained, and the flash flood disaster investigation and evaluation project identified in the key areas to verify the results. The study shows that the model of risk assessment of flash flood disaster can be applied to the classification of flash flood disaster risk in small scale.
Key words
flash flood disaster /
risk division /
logistic regression model /
transformation assignment funtion /
GIS
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