水利调度修复东湖水质的数值模拟

总结武汉东湖水质污染问题基础上，根据湖泊和港渠联通状况设计了长江-东湖水利调度的调水线路和调水方案。基于一维港渠河道水动力水质模型和二维湖泊水动力水质模型，通过嵌套耦合求解的方式实现耦合，建立了一、二维湖泊河网水动力水质耦合模型，并利用实测数据进行了参数率定和验证。采用数值模拟的方式研究了水利调度影响下东湖水质的改善效果，结果表明：水利调度影响下东湖主要湖区水体CODMn和TN指标得以明显改善，但TP指标改善不大；东湖湾汊众多，个别湖区受到调水线路影响较小，水质改善不明显。因此水利调度可以作为东湖水体修复的重要思路。建立的数学模型也可以为东湖以及其他类似水域的水污染治理提供科学参考和依据

NUMERCIAL SIMULATION OF WATER DIVERSION TO IMPROVE THE WATER QUALITY OF THE DONGHU LAKE IN WUHAN CITY

In the light of the current water environment of Donghu Lake and the historical hydraulic connection between the Yangtze River and the Donghu Lake,a scheme of water diversion from the Yangtze River to Donghu Lake is proposed to remedy the water quality of the lake.A coupled one-dimensional river and two-dimensional lake hydrodynamic and water quality model is developed in this paper.The principle model coupling is that water level,discharge and water quality simulated by the one-dimensional river model and two-dimensional lake model are equal respectively at the junction section.The parameters of the model are calibrated and validated with water quality and hydrology data of field measurement.Then,the model is applied to simulate the influence of water diversion on the water quality of Donghu Lake.The simulation results show that the water diversion will decrease the concentration of CODMn and TN obviously,but will not significantly decrease the concentration of TP of the water body.The simulation also shows that some bay region could not be affected by the water diversion and the water quality could not be improved.Water diversion can be a practical method for water quality remediation of Donghu Lake.The proposed model could be a effective tool for water environment management in other lake regions.