北京市水资源与电力都强烈依赖外地供给。供水水源主要来自地表水、地下水、南水北调来水、再生水和雨洪水（五水）；电力外购主要来自华北电网，由内蒙古、山西、河北和天津等供应。根据五水多源利用特征，本项目核算北京市人工水循环系统的电力消耗，以及电力系统生产（本地电力和外调电力）的水消耗；利用关联矩阵模拟多水源交互过程；耦合SWMM、EPANET等水力模型识别五水联调过程中的电力消耗变化，模拟供水系统能耗对用户用水量、多源供水比例变化的响应；建立多区域投入产出（MRIO）模型识别外购电力过程引起的水-电内向转移过程；构建城市水-电耦合过程模型，开展多目标情景优化，辨识影响水-电利用路径和空间转移的关键特征，提出“五水联调”背景下的水-电优化方案，实现水-电协同管理，提高北京市水资源和能源供应安全保障。

Beijing's water resource and electricity are both strongly dependent on external supply. Water supply includes surface water, groundwater, water from the South-to-North Water Transfer Project, reclaimed water, and rain and flood (Five Waters); Purchased electricity is mainly from the North China Power Grid, which is supplied by Inner Mongolia, Shanxi, Hebei and Tianjin. According to the characteristics of utilization of five-source water, this project calculates the power consumption of Beijing ’s social water circulation system and the water consumption of electricity production (including local power and externally purchased power); Correlation matrix is applied to simulate the interaction of multiple-source water; SWMM and EPANET models are used to identify the changes of electricity consumption during the five-source water joint regulation, and to simulate the response of electricity consumption to the changes of water consumptions of different users and the changes of proportion of multi-source water supply; Multi-regional input-output (MRIO) model is established to quantify water import caused by purchasing electricity from outside; The urban water-electricity nexus model is constructed; Multi-objective scenario optimization is performed to identify key impact factors that affect water-electricity utilization and space transfer, and a water-electricity optimization scheme is proposed based on the five-resource water joint regulation to realize the coordinated management of water and electricity, and to improve the security of water and energy supply in Beijing.