HEC-RAS模型在通州两河水网水质模拟中的应用

Application of HEC-RAS model in water quality simulation of Tongzhou District two river network

为了准确模拟北方人工建设河网的水质变化,采用HEC-RAS二维水动力模型及一维水动力水质模型,使用实测气温、风速、云量、湿度、大气压强及水温数据,对北京城市副中心通州两河水网设计方案进行模型验证及目标可达性分析。精度较高的数字地形高程模型有利于模型计算的稳定性和精确性;经模拟设计方案下两河水网模型基本达到全年IV类水质指标;7月16日15时为温度最高时刻,该时刻下两河水网东南区域易发生水华。研究成果可为相关北方河网及人工建设河网的水质模拟提供借鉴。

In order to accurately simulatte based on the HEC-RAS two-dimensional hydrodynamic mod-el and one-dimensional hydrodynamic water quality model,this study conducted model verification and target accessibility analysis for the design of the river network in Tongzhou,urban sub-center of Beijing.Through combining these measured data such as temperature,wind speed,cloud cover,humidity,atmo-spheric pressure,and water temperature,the researchers found that a high-precision digital elevation model(DEM)was beneficial for ensuring the stability and accuracy of the model calculations.the results showed that the river network in Tongzhou could generally achieve the Grade IV water quality index throughout the year using this simulating design scheme.However,on July 16th at 3 PM,the southeastern region of the river network was prone to algal blooms on the hottest time of the day.This research findings could provide valuable reference and guidance for water quality simulations in related river networks in northern China,as well as for the construction of artificial river networks.