北京城市副中心典型海绵体地表水与地下水交互作用研究

Study on the Interaction Between Surface Water and Groundwater of Typical Sponge Facilities in Beijing Municipal Administrative Center

海绵城市建设是推动绿色低碳城市建设及可持续发展的重要保障措施,可以有效解决城市内涝、水资源短缺等问题,对于城市生态文明建设具有重要意义。以北京城市副中心点、线、面3种不同类型海绵体作为研究对象,利用2018年5—9月枯、丰水期采集到的345组地表水和地下水同步连续监测数据,分析了典型海绵体的地下水水化学特征及其形成机制,探讨了不同含水层之间的水力联系。同时,以Cl-为指示因子,结合其他水化学指标,研究分析了典型面状海绵体地下水与地表水之间的交互作用及影响程度。结果显示:在垂向上,埋深10 m和20 m含水层地下水之间联系密切,且受大气降水影响明显;埋深50 m和80 m含水层组地下水与其他含水层组无明显水力联系。在平面上,线状及面状海绵体地表水对地下水的影响距离为80~100 m;随着地层埋深的增加,地表水对地下水的影响程度减弱。

Sponge city construction is a safeguard measure for urbanization construction and sustainable development,which can effectively solve problems such as urban waterlogging and water shortage,also has an important meaning to the construction of urban ecological civilization.Taking three different typical sponges from the point,line and plane of Beijing subsidiary administrative center as the research object,345 pieces of synchronous continuous monitoring data of surface water and groundwater collected from May to November in 2018 are used to analyze the hydrochemical characteristics,formation mechanism of groundwater and the hydraulic connection between different layers during the construction of sponge city.The interaction and influence degree between groundwater and surface water are analyzed by using the indicator element Chloride and other hydrochemical components.The results show that in vertical direction,the groundwater of 10 m,20 m layers has close hydraulic connection,which is seriously influenced by precipitate water.The groundwater of 50 m,80 m layers get relative stabilization and has no hydraulic connection with other layers.In horizontal direction,the influence distance of surface water in line and plane sponge is from 80 m to 100 m.Along with the increase of layer depth,the influence decreases.