Comprehensive flood risk assessment based on RS and GIS in a county area

Flood risk assessment is one of the important means to study flood disasters and can provide a basis for the planning of reg ional flood disaster monitoring and prediction, flood control and disaster mitigation measures. In this study, Wu' an City of Hebei P rovince was taken as study area, based on the theory of disaster risk system and the local actual situation, hazard, sensitivity , and prevention capability ability o f flood disaster were selected as assessment aspects. There were nine evaluation indicators of social economic factors such as population density and economic level. The GIS weighted comprehensive evaluation method and spatial analysis super position functions were used to obtain flood risk assessment results. The results indicated that the overall risk distribution o f flood disaster s in W ucan City was characterized by the gradual decline of the high2risk areas in the central and southwestern areas. Specifically, t he river valley had a high2r isk level, and the risk along the Ming River w as higher than other areas. The risk level of the plain was obvious, and the sensitivity was strong; the risk level o f farming area was higher than that in the forest and gr ass area. Through the historical disaster data to verify the evaluation results, the Wu' an flood disaster assessment results presented in this paper are consistent with the actual situation.

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