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为了解南宁市洪涝灾害风险的严重程度及其分布情况,首先介绍了致灾因子指标、孕灾环境指标和承灾体指标在Arc GIS10.0下的获取方法,然后采用层次分析法(AHP)软件YAAHP对不同指标的权重进行了计算,最后采用洪灾风险评价模型,对南宁市城区2005-2012各年进行了洪涝灾危险性、易损性及综合风险评价。从危险性及综合风险评价结果可以看出,南宁城区的高危险区主要集中于郁江沿岸两侧及与内河交界处,这与南宁城区防洪图基本吻合。
In order to understand the severity and distribution of flood risk in Nanning City, firstly, the methods of obtaining hazard index, index of pregnant environmental disaster and index of disaster-bearing disaster under ArcGIS10.0 were introduced, and then AHP (Analytic Hierarchy Process) Software YAAHP calculates the weights of different indicators. Finally, flood risk assessment model is used to evaluate the flood risk, vulnerability and comprehensive risk assessment of urban areas in Nanning from 2005 to 2005. It can be seen from the results of the risk and comprehensive risk assessment that the high-risk areas in Nanning urban area mainly concentrate on the two sides of the Yujiang River and at the junction with the inland river, which basically agrees with the flood control map of Nanning urban area.