The Application Of Flood Risk Calculation Based On MIKE And GIS

Flood risk calculation is the step that analyzes the probability of different intensity flood occurring and the following loses, and it is the groundwork for flood risk management, acting an important role. Flood risk map drawn from the above step can exhibits flood features, geographic elements and socio-economic information in the submerged area comprehensively and directly, and it can serve as the significant basis for flood risk management. Therefore, flood risk calculation is very important for successfully managing flood. Because Geographical Information System (GIS) has a more specific and direct understanding of spatial relations with its powerful spatial data analysis and management capacity, the introduction of GIS into flood risk calculation is very necessary.In this thesis, we study the theory and characteristic of different flood risk analysis methods and their relative technical routes. Then hydraulic method combined with history-flood method is adopted for flood risk analysis according to the actual situation. On the base of levee dangerous condition simulation and field visit in vulnerable places, the thesis calculates flood submerging by the way of coupling one-dimension river way and two-dimension flood plain in different vulnerable places and different flood frequency. For the purpose of visualizing flood data in the form of flood risk map, we realize the batch processing of flood result data to satisfy the demand of mapping. Finally, we analyze the single factor that affecting site construction, combining flood submerged area, and then fuzzy membership function is employed to analyze these factors. In the following, division map in the floodplain is figured out by the method of fuzzy comprehensive evaluation, so that it can be used to provide decision information for flood plain construction and planning, and expand the application range of flood risk result.