Research on Risk Assessment and Spatio-Temporal Variation of Urban Flood Disaster Based on GIS-----a case study in Harbin
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Abstract:
Accurate knowledge of the spatial and temporal variations of flood disaster risk is of important significance for determining layout of urban disaster prevention. In this study, integrated flood risk index was used to evaluate the flood disaster risk in Harbin, and Markov Chain was used to analyze the spatial and temporal variations of flood disaster risk. The results showed that (1) the area with very high flood risk in Harbin has increased, the area with relative high and moderate flood risks has decreased, and the area with low flood risk has increased from 2000 to 2010;(2) the high level of flood disaster risk has increased gradually in the ten years, and the overall risk has increased but with different local variations; and (3) the interchange between middle risk level and high risk level is frequent, while the interchange between low risk level and lower risk level is relatively stable. Moreover, the interchange between high risk level and other risk levels are very active.
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