北京市轨道交通机场线西延工程洪涝设防水位分析

Analysis of the flood prevention water level of west extension project of Beijing rail transit airport line

为保障人民生命财产安全,进行北京市轨道交通机场线西延工程洪涝设防水位分析。采用传统的水文分析计算项目区最大积水量和积水时间;通过ArcGIS软件根据DEM地形数据采用水量平衡法绘制各排水分区内的积水范围和积水深度。结果表明,在50年一遇降雨条件下,北新桥站和东直门站均没有积水,相关工程设施最低点分别高于周边积水水位0.26 m和2.00 m。因此,在设计排涝标准下,建设项目基本没有内涝风险,洪水对建设项目的影响较小。另外,结合水文计算和通惠河基本情况分析,100年一遇洪水位低于堤顶高程0.36 m,本项目不受通惠河百年洪水淹没影响。

In order to ensure the safety of people's lives and property,the flood prevention water level of west exten⁃sion project of Beijing rail transit airport line is analyzed.The traditional hydrological analysis is used to calculate the maximum amount and ponding time in the project area.According to DEM topographic data,ArcGIS software is used to draw the range and depth of water accumulation in each drainage area with water balance method.The results show that under the condition of 50 year frequency rainfall,there is no water in Beixinqiao Station and Dongzhimen Station,and the lowest points of related engineering facilities are 0.26 m and 2 m higher than the surrounding water level,respectively.Therefore,under the design drainage standards,the construction project basically has no risk of waterlogging,and the impact of flood on the construction project is small.In addition,combined with the hydrological calculation and analysis of the basic situation of Tonghui River,the 100 year frequency flood water level is 0.36 m lower than the elevation of the dike top,therefore,the project is not affected by the 100 year frequency flood of Tonghui River.