基于MIKE21模型的人工生态湖优化设计

Application of MIKE21 Water Environmental Mathematic Model in the Planning and Design of Artificial Eco-Lake

采用MIKE21水质水动力综合模型模拟计算了不同方案下北川河生态河道10#生态湖的流场及水体交换情况,分析了湖区水体在不同引水条件下发生置换的效率。结果表明:在湖体西北部新开一个引水口,新开引水口引水流量为1.5 m3/s、原有引水口流量为0.5 m3/s时,既能大幅度改善10#生态湖水环境质量,又能减少调水时间并节约水量,为最优设计方案;但在湖区现有设计形态下,湖区存在多处死水区域和水体交换能力较差的区域,可能成为湖区潜在的水质重污染区和富营养化高发区,需进一步优化现有湖体设计形态。

Based on MIKE21, a two dimensional water quality hydrodynamic model, this paper simulated several different schemes of 10# eco-lake in Beichuan River flow field of designs, and confirmed the replacement efficiency of water body during different diversion conditions. It shows that when there is another new inlet on the top left of the lake with discharge 1.5 m3/s and 9# sluice with discharge 0.5 m3/s synchronously, will im- prove the water environment quality greatly of 10# eco-lake which needs less time and water, and is the most economic scheme. The design mor- phology of the lake exist a lot of dead water and poor exchange capability areas, which may turn into the potential region of heavy pollution and the region of eutrophication, and need further optimizing design.