Risk assessment of land subsidence at Tianjin coastal area in China |
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| Authors: | Beibei Hu Jun Zhou Jun Wang Zhenlou Chen Dongqi Wang Shiyuan Xu |
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| Institution: | (1) Key Laboratory of Geographic Information Science of Ministry of Education, East China Normal University, Shanghai, China;(2) College of Urban and Environment Science, Tianjin Normal University, Tianjin, China;(3) Tianjin Land Subsidence Control Office, Tianjin, China; |
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| Abstract: | Risk assessment and zoning are very important to risk management. In this study, a land subsidence risk assessment index was
proposed based on the Disaster Risk Index. The cumulative subsidence volume, the land subsidence velocity, and the groundwater
exploitation intensity were collected, analyzed, and put together to create a land subsidence hazard evaluation map in Tianjin
coastal area. The population density, Gross Domestic Product per square kilometer, and construction land proportion were adopted
as indexes to create the vulnerability map. In addition, the capability of land subsidence prevention and reduction was also
assessed. Finally, the land subsidence risk map was created by combing the hazard, vulnerability, and the capability of land
subsidence prevention and reduction map. Specifically, the land subsidence risk was classified into five levels, i.e., very
high, high, medium, low, and very low. The result of this research could provide a solid basis for the sustainable development
as well as disaster prevention policy-making of Tianjin city. |
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