基于GIS的潍坊市暴雨洪涝灾害风险区划

Risk Evaluation for Flood Hazard in Weifang Based on GIS

为了提高对暴雨洪涝灾害的抗御能力,为潍坊市的暴雨洪涝防灾减灾提供技术支持和决策依据,基于潍坊市1:50000的DEM数据和2009年统计年鉴资料以及历史灾情数据,计算得出影响潍坊市洪涝灾害风险的评价指标,即致灾因子危险性、孕灾环境敏感性、承灾体易损性、防灾减灾能力的综合作用。将洪涝灾害风险性评价技术和GIS技术相结合,对洪涝灾害程度进行评价和等级划分,绘制潍坊地区的洪涝灾害风险区划图。结果表明,诸城全市、高密市的绝大部分地区属于洪涝高风险区,只有极少数地区为较高风险区;安丘偏东南大部分地区、高密北部少数地区、昌乐东南部属于较高风险区;较低风险区和低风险区主要分布在昌邑北部大部分地区、寿光大部分地区、潍坊北部和中部以及青州西部;其余地区基本为中等风险区。

In order to support and decisionimprove the resilience of the rainstorm and flood disasters, and provide the technical making basis for preventing and mitigating rainstorm and flood disasters in Weifang City, based on the digital topographic map of 1：50000 scale, statistic yearbook of 2009 and historical disaster data in Weifang, integrative estimate indexes which affected the flood risk in Weifang, including risk of flood hazard-form factors, sensitivity of flood hazard-breeding circumstance, vulnerability of flood hazard-bear circumstance, and capacity of flood hazard resistant were calculated. Combined the technology of flood risk assessment and GIS, the extent of flood was assessed and graded. And then the flood risk areas zoning map in Weifang was drew. The results showed that, all the areas in Zhucheng and most areas in Gaomi were the highest flood risk regions; most areas in southeast of Anqiu, small areas in northern of Gaomi and southeast of Changle were higher risk regions; the lower and low risk regions were most areas in northern of Changyi, most areas in Shouguang, northern and middle of Weifang and western of Qingzhou; the other areas were medium risk regions.