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水力发电学报 ›› 2024, Vol. 43 ›› Issue (9): 1-12.doi: 10.11660/slfdxb.20240901

• •    下一篇

特约论文:不同调水方式对巢湖水质影响模拟

  

  • 出版日期:2024-09-25 发布日期:2024-09-25

Simulations of influence of different water transfer methods on water quality in Chaohu Lake

  • Online:2024-09-25 Published:2024-09-25

摘要: 引调水工程是目前用来改善湖泊水质的重要手段,然而引调水的调水路线、来水水量以及来水水质对湖泊水质改善效果都至关重要。本文以“引江济巢”工程为例,针对巢湖的浅水湖泊特征,考虑引调水入湖后不仅对水量和水质有直接改善作用,还可能因为湖区水动力条件改变及内源释放影响水质,通过构建二维水动力水质模型,模拟不同调水路线、水量下湖区水动力条件,进一步考虑不同来水水质和底泥释放对水质改善的影响。结果显示,调水对流场的扰动在丰水年较弱、枯水年较强,流量对湖区水质影响随流量增大而增强,来水水质的优劣是决定湖区水体水质是否改善的关键。整体而言,西湖区受调水影响较小,东湖区能够对全湖水质变化起到指示作用。调水方案应基于湖泊实际水量与水质状态综合考虑调水流量与水质制定。

关键词: “引江济巢”工程, 巢湖, MIKE21, 调水路线, 水环境治理

Abstract: Water diversion projects are currently an important means to improve lake water quality. However, the water diversion route, incoming water volume, and incoming water quality are all crucial factors to achieve the improvement. This study develops a two-dimensional hydrodynamic water quality model to simulate the hydrodynamic conditions of a lake area, and applies it in a case study of the Yangtze-to-Chaohu Water Transfer Project. Based on the shallow lake characteristics, we consider that water flow diverted into Chaohu Lake not only improves directly the lake water quantity, but may cause changes in the hydrodynamic conditions in the lake area and endogenous releases. Thus, this model simulates the impacts on water quality improvement caused by different water diversion routes and different water volumes that change the lake’s hydrodynamic conditions, by different incoming water quality, and by strong release of nitrogen and phosphorus from endogenous sources. The results show that water diversion imposes weak disturbances to the lake flow in wet years and strong ones in dry years. A larger diversion flow rate affects more the lake water quality. The incoming water quality is the key to determining whether or not the lake water quality can be improved. Overall, the water transfer affects less the water quality in the western lake area. In contrast, water quality in the eastern lake area is an indicator of the changes in water quality across the entire lake. A water diversion plan should be formulated based on the lake's real water volume and water quality status, and take into account the flow rate and water quality of the water diversion project.

Key words: Yangtze River Water Transfer Project, Chaohu Lake, MIKE21, water diversion routes, water environment management

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