中顺大围河网水动力水质调度模拟系统研究

Hydrodynamic and Water Quality Dispatching Simulation System in Zhongshun Dawei River Network

珠江三角洲河网水系复杂,联围众多,其中以中顺大围水系结构最为复杂、闸泵群联合调度难度最大。为充分挖掘水工程联合调度对水量水质的调控潜力,以中顺大围作为研究对象,构建中顺大围一维水动力-水质耦合模型,实现各闸泵调度方案下的围内水量水质过程模拟;在此基础上,建立闸泵群联合优化调度模型,实现在不同引换水条件下闸泵群调度方案的最优决策;最后基于水量水质模拟及调度模型研发了中顺大围河网水量水质调度模拟系统,实现中顺大围水动力特性模拟、污染物浓度及水质变化动态模拟、水污染应急调度及过程可视化,形成了中顺大围水系连通下基于闸泵群联合优化调度的水量-水质模拟调控技术体系。基于该系统对2个典型场景进行实例分析,结果表明:在进行优化调度的情况下,调度时段末围内COD和NH3-N的加权浓度分别相比不进行优化调度的情况改善了10.26%和27.27%,调度效果显著,可为中顺大围水量水质调度决策提供可靠的技术支撑。

The river system in the Pearl River Delta river network is complex with numerous embankments,among which the Zhongshun Dawei river system has the most complex structure and the greatest difficulty in the joint dispatching of sluices and pumps.In order to fully explore the potential of joint dispatching of water projects in controlling water quantity and quality,this paper took Zhongshun Dawei as the research object,constructed a one-dimensional hydrodynamic-water quality coupling model for Zhongshun Dawei,and simulated water quantity and quality processes within the embankment under various dispatching schemes of sluices and pumps.On this basis,a joint optimization dispatching model for sluices and pumps was established to achieve the optimal decisionmaking of dispatching schemes under different water diversion conditions.Finally,based on the simulation and dispatching models of water quantity and quality,a water quantity and quality dispatching simulation system for the Zhongshun Dawei river network was developed,which realized the simulation of hydrodynamic characteristics of Zhongshun Dawei,the dynamic simulation of pollutant concentration and water quality changes,the emergency dispatching of water pollution,and the visualization of the process.A water quantity and quality simulation and control technology system based on joint optimization dispatching of sluices and pumps under the connection of the Zhongshun Dawei river system was formed.Based on the system,two typical scenarios were analyzed,and the results show that in the case of optimization dispatching,the weighted concentrations of COD and NH3-N at the end of the dispatching period are improved by 10.26%and 27.27%,respectively,compared with the case without optimization dispatching.These findings demonstrate the significant dispatching effects and provide reliable technical support for water quantity and quality dispatching decision-making in the Zhongshun Dawei region.