基于数值模拟的南湖流场优化与水质改善研究

针对城市景观水体流动性差,往往处于封闭或半封闭状态,容易造成富营养化的问题,以典型城市景观水体山东郓城南湖为研究对象,基于MIKE21软件构建了湖区水动力-水质耦合模型,对湖区流场与水质情况进行了模拟计算。为改善湖区流场和水质状况,提出增设水源热泵回水口的优化方案,并根据模型模拟结果,对不同方案流场改善效果进行了分析比较。结果表明:增设水源热泵回水口能有效改善南湖流场分布与湖区水质；以氨氮为评价指标,沿湖岸设置4个回水口的方案与原方案相比较,观测点的氨氮质量浓度平均降低了59.7%,对水质的改善效果最好。

Flow field optimization and water quality improvement of Nanhu Lake based on numerical simulation

In view of the poor mobility of urban landscape water body, being often in a closed or semi-closed state and easy to cause eutrophication, flow field optimization research was carried out on the typical urban landscape water body of Nanhu Lake in Yuncheng City, Shandong Province. First, the hydrodynamic and water quality coupling model for Nanhu Lake was constructed based on MIKE21 software, and the flow field and water quality in the lake area were simulated. Then, schemes of adding water-source heat pump outlets were proposed for improvement of the flow field and water quality in the lake area. The effects of different schemes were comparatively analyzed according to simulated results. The analysis results show that increasing the number of outlets may effectively improve the flow field distribution and water quality in Nanhu Lake, and the scheme of setting four outlets along the lake shore is effective for water environment improvement in Nanhu Lake, with the ammonia nitrogen mass concentration at the observation point decreasing by 59.7% on average, as compared with the original scheme.