Regional flood disaster risk zoning in Shandong reach of Eastern route of outh-to-North Water Transfer Project based on GIS
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Abstract:
In view of the flood control demand of the East Route of South-to-North Water Diversion Project in Shandong area, the flood risk zoning model was established based on the fundamental principles of hazard, sensitivity and vulnerability of flood disasters. Nine influencing indices such as rainstorm days in the flood season, rainstorm intensity , elevation, standard deviation of elevation, river network density, and buffer zone of lakes, gross domestic product, population density, and land use type were comprehensively considered. The weights of indices were determined by means of the analytic hierarchy process ( AHP) with the auxiliary of Monte Carlo method. The cartographic algebra function in ArcGIS was adopted to perform the normalization processing of the various indicator layers. After calculating and mapping process, the risk zoning map of flood disasters of the study area was obtained. The results showed that the high2risk areas of south, north and east Shandong were located in the surrounding regions of Nansi Lake and so me local areas in Zaozhuang City, L iao cheng City and the north side o f the Yellow River, the vicinity of Jinan City and part of regions of the east peninsula. Compared with the historical data o f flood disaster s, the above zoning results proved t o accord with the actual situation of the study area, which show ed that the results have important referencing values for flood prevention and decision management in Shandong section of the East Route of South-to-NorthWater Transfer Project.
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