MIKE11在梅梁湖调水试验中的应用研究
江苏省水文水资源勘测局无锡分局, 江苏无锡 214031
| 摘 要： | 为了加强太湖蓝藻治理科技研究工作，无锡市水利学会申报的“太湖（梅梁湖）调水对控制蓝藻、改善湖体水质的作用研究”项目被市科协批准立项。通过进一步研究泵站调水对控制蓝藻、改善梅梁湖湖体水质的改善作用，对实施好太湖流域水环境综合治理，更好发挥太湖生态和社会效益具有重要的现实意义。本项目主要通过泵站调水试验工作，等时距同步监测风向风力、水位、流量、水质（溶解氧、总磷、总氮、高锰酸盐指数、藻密度等）资料，结合提前实测的水道断面资料编制了河网文件，合理确定了模拟计算范围，确定了边界条件和计算时段，采用MIKE11水动力、水质对流扩散模型进行模拟计算分析并开展了模型验证工作，取得了较为理想的模拟成果。分析研究表明，调水试验对污染物浓度影响不大，梅梁湖水质综合评价类别没有变化，仍为Ⅴ～劣Ⅴ类，主要超标项目为总磷、总氮。试验期8天调水共减少梅梁湖高锰酸盐指数147吨、总磷5吨、总氮42吨，减少藻密度245万个细胞/L。如果试验期8天梅梁湖泵站以60 m3/s流量调水，大渲河泵站以30 m3/s流量调水可减少梅梁湖高锰酸盐指数440吨、总磷16吨、总氮119吨，减少藻密度428万个细胞/L。通过调水加大了梅梁湖水体流动速度，加大了湖体的自净能力，大幅度地减少了无锡市太湖重点水源保护区和观光游览区的水体污染物，降低了藻密度。 |
| 关 键 词： | MIKE11; 梅梁湖; 调水试验; 应用研究 |
| DOI： | 10.57237/j.wjese.2023.02.002 |
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收稿日期: 2023-02-03
接受日期: 2023-03-15
在线出版日期: 2023-03-28
Application Study of MIKE11 in Meiliang Lake Water Transfer Experiment
Wuxi Branch of Jiangsu Bureau of Hydrology and Water Resources Survey, Wuxi 214031, China
| Abstract: | In order to strengthen the scientific and technological research work of cyanobacteria control in Taihu Lake, the "Taihu (Meiliang Lake) water transfer on the control of cyanobacteria, improve lake water quality" project declared by Wuxi Hydraulic Society was approved by the municipal Association for Science and Technology. By further studying the effect of pumping station water transfer on controlling cyanobacteria and improving the water quality of Meiliang Lake, it is of great practical significance to implement the comprehensive water environment management of Taihu Lake basin and give full play to the ecological and social benefits of Taihu Lake. This project mainly through the pump station water transfer test work, synchronously monitoring wind direction, water level, flow, water quality (dissolved oxygen, total phosphorus, total nitrogen, permanganate index, algae density, etc.) data, combined with the waterway section data measured in advance to prepare a river network file, reasonably determine the simulation calculation range, determine the boundary conditions and calculation period. MIKE11 hydrodynamic model and water quality convection and diffusion model were adopted for simulation calculation and analysis, and model verification was carried out, achieving ideal simulation results. The analysis showed that the water transfer test had little effect on pollutant concentration, and the comprehensive evaluation category of Meiliang Lake water quality did not change, still classified as V ~ poor V, and the main items exceeding the standard were total phosphorus and total nitrogen. During the experiment period of 8 days, the water transfer reduced the permanganate index by 147 tons, the total phosphorus by 5 tons, the total nitrogen by 42 tons, and the algal density by 2.45 million cells /L. If the water transfer rate of Meiliang Lake pumping station is 60 m3/s and that of Dashihe Pump station is 30 m3/s, the permanganate index of Meiliang Lake can be reduced by 440 tons, total phosphorus by 16 tons and total nitrogen by 119 tons, and the algae density can be reduced by 4.28 million cells /L. The water transfer increased the water flow speed of Meilang Lake, increased the self-purification capacity of the lake body, greatly reduced the water pollutants in Wuxi Taihu Lake key water source protection area and sightseeing area, and reduced the density of algae. |
| Keywords: | MIKE11; Meiliang Lake; Water Transfer Test; Applied Research |
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