基于3S技术的天津市洪涝灾害风险区划与分析

根据天津市1961 - 2008年的气象观测资料，综合全省14个区县的自然、社会经济以及防灾减灾等要素，采用GIS技术和自然灾害风险指数方法及洪涝灾害风险评价模型，得出天津市区县级洪涝灾害风险指数并绘制出风险区划图。结果表明：宁河大部、宝坻南部、武清东部、静海北部由于地势平坦、河网密集，其洪涝灾害风险的可能性最大；西青、东丽、津南、塘沽和大港的部分地区由于抗灾能力较强，孕灾环境敏感指数较小，洪涝灾害风险最小。

GIS/RS-based Zoning and Analysis of Flood Disaster Risk in Tianjin

Based on geography information system, methodology of flood and waterlogging disaster risk indexand models of flood and waterlogging disaster risk assessment, the flood risk indexes are calculated and flood risk zoning maps are worked out for every county of Tianjin by using the data of whether stations from 1961 to 2008 and integrating the factors of nature, social economy as well as disaster prevention and reduction in the province. The results indicate that the drought disaster risk was highest due to flat and many rivers in the most of Ninghe, the south of Baodi, the east of Wuqing and the north of Jinghai. While, the flood disaster risk was lowest due to strong anti-disaster ability and low sensitivity index of geo-hazards in Xiqing, Dongli, Jinnan,Tanggu and parts of Dagang.