钱塘江引水入城工程水质分析及预测研究

复杂河网的水质分析与预测一直是广为关注的研究课题。本文采用一维非恒定流圣维南方程组、汉点连接方程组和边界条件，建立了运西河网水动力学模型和水质模型，采用四点加权Preissmann隐式差分格式离散并求解。对多种备选引水方案下的河网水质CODMn和水质分类进行预测，提出了相应的最优引水规模；分析了钱塘江沿岸引水对下游水厂含氯量的可能不利影响和相应对策；为运西河网的综合整治方案比选提供了技术支持。

Study on water quality analysis and forecast of Qiantang river diversion project

Water quality analysis and forecast of complicated river networks is an important research topic that has attracted our extensive concerns. The one-dimensional hydrodynamic model is developed together with either the continuity or the energy equations at all river junctions for the given boundary conditions. A weighted implicit four-point format is used to solve the Saint-Venant equations. For each available diversion scheme, water quality(its index of COD_ Mn ) and its classification are forecasted, and its optimal diversion scale is proposed. The possible adverse effect on the chlorine content of water works located on the lower reaches of Qiantang river is analysed and the corresponding countermeasure is given. These research achievements provide the technical supports and selected schemes for renovating river networks.