The apply of GIS in flood risk management in Changzhutan city cluster

Yangtze River is always the high-frequency area of flood disaster in China. Though the measures of defending flood and reducing disaster damage have been greatly enhanced with the development of science and technology, economic losses that flood had made are much bigger than ever before because of the advance of society and the rapid development of economy. Facing the increasingly serious flood disaster and other natural problem, governments at all levels pay much attention to how to defend disaster and reduce disasters damage, and now began to use technology to promote the development of disaster prevention system. Using remote sensing data as main data resource and considering indices of natural factor, flood control works and social and economic elements, this research discussed the thinking of fast early warning of flood in Changzhutan area and main technology of flood danger estimation with the support of city flood danger estimation model, disaster division model and disaster analysis model under the comprehensively apply of 3S technology and geographic information system platform software.