珠海横琴新区水系引水调控效果模拟研究

Simulation on Water Diversion Regulation Effect in the Central Ditch of Hengqin New District,Zhuhai

珠江三角洲感潮河网区,利用外江潮位和内河水位涨落潮差引清调水是改善感潮河网水环境的一种有效途径。珠海横琴新区中心沟位于珠江三角洲感潮河网区,为改善横琴新区中心沟水环境,建立一维水动力水质数学模型,开展改善区域水动力水环境的调控方案研究,计算分析原调控方案及优化调控方案换水效果。模拟结果表明:优化调控方案区域流速增加了0.20 m/s、半交换周期减少了101.5 h、换水率提高了1.1倍,区域水环境改善效果明显。研究成果对于感潮河网区引水调控方案的实施有一定的借鉴价值。

The tidal river network area of the Pearl River Delta uses the ebb-and-flow differences between tidal level of the outer river and water level of the inland river to divert clear water for regulation.This is an effective way to improve the water environment of the tidal river network.The central ditch of Hengqin New District is in the tidal river network area of the Pearl River Delta.To improve the water environment of the central ditch in Hengqin New District,this study builds a one-dimensional hydrodynamic mathematical model of water quality and investigates the hydrodynamic regulation scheme for improving the regional water environment.Then,the water exchange effects of the original regulation scheme and the optimized regulation scheme are calculated and analyzed.The simulation results show that the optimized regulation scheme increases the regional flow rate by 0.20 m/s,shortens the half-exchange period by 101.5 h,and increases the water exchange rate by a factor of 1.1,which demonstrates a great improvement effect on the regional water environment.The results can be used as a reference for the implementation of the water diversion regulation scheme in the tidal river network area.