Assessment of urban system vulnerability degree to flood disaster in Shanghai

The assessment of vulnerability degree to flood disaster is an important bridge across flood disaster and risk. With the significance and high vulnerability to natural disaster, coastal cities have been arousing great concern of the governments in respect of natural disasters. Less researches have been conducted in coastal urban system vulnerability degree assessment to flood disaster domestically in comparison with the studies abroad. For the accurate flood disaster risk assessment, the research of urban system vulnerability degree to flood disaster is of great importance. As a result, the reasonable flood disaster alleviation measures could be proposed. From the systematically point of view, this article builds up vulnerability degree assessment indexes system of Shanghai urban system on the basis of compound ecosystem theory to flood disaster from many aspects such as the nature, society, and economic, adopts analytic hierarchy process and information entropy model to constitute weight, gives consideration to objective and subject merits, and improves the rationality of appraising results. Finally, the vulnerability degree of flood disaster estimation was carried out with the aid of the fuzzy comprehensive assessment. The results of this article could be useful for the city government in land use planning as well as social and economic development planning in Shanghai.