基于GIS淹没模型的城市道路内涝灾害风险区划研究

在求取襄阳中心城区重现期雨量与可抽排雨量的基础上,采用基于GIS暴雨洪涝淹没模型计算不同重现期致灾雨量的淹没水深和范围;依据城市内涝对道路的实际影响,制作城市道路内涝灾害风险区划图。结果表明,该方法能够直观表达研究区域内不同雨量阈值的内涝灾害淹没风险分布,定量评估淹没水深、淹没范围。同时给出了城市道路内涝灾害风险区划图,结合城市道路信息,准确定位高风险易涝街区,为政府部门决策提供科学依据。

RISK REGIONALIZATION OF URBAN ROADS WATERLOGGING DISASTERS BASED ON GIS RAINSTORM FLOOD INUNDATION MODEL

Based on acquiring rainfall return period and pumping rainfall of Xiangyang center city, submerged depth and scope of disaster-causing areal rainfall in different return period were obtained by using GIS Rainstorm Flood Inundation Model. Waterlogging flood risk distribution of urban roads was made according to the actual impact of urban waterlogging on the roads. The results indicated that this method could directly show the waterlogging flood risk distribution of different threshold rainfall in different area, quantitatively assessed the submerged depth and scope of flood. Meantime, the method could provide waterlogging flood risk distribution of urban roads, combined with the urban roads information and positioning high-risk waterlogged street, and put forward scientific basis for government.