太原市迎泽湖富营养化控制的模型研究

针对湖泊富营养化问题,对太原市迎泽湖进行资料收集和长期水体监测,综合水动力模型、水质模型,融合参与湖泊富营养化的各种生命活动过程,建立湖泊富营养化耦合模型,用实测水质数据进行参数率定与验证,选取总氮、总磷、叶绿素a及透明度4项因子进行模拟,得出迎泽湖营养物质输移扩散及时空分布规律.结合迎泽湖实际情况,从补水方式、补水频率以及改变湖泊柔性结构三方面,提出改变水动力条件的方案并进行数值模拟,研究了各方案水动力、物质输移扩散的改进效果,结果表明,作为富营养化程度表征的叶绿素a在空间和时间分布上均存在一定的规律性,其浓度变化范围在0.035~0.105mg/L之间;藻类等浮游植物迅速增殖导致水质恶化水华暴发,而采取加大湖水水力循环和改善入口水质的控制方案,可有效改善湖水水质.

Model study on eutrophication control in Yingze Lake of Taiyuan city

Aiming at Yingze Lake eutrophication, based on gathering data and long-time water quality monitoring, hydromatical model and water quality model, combined with a variety of biological processes were applied to established lake eutrophication coupled model, calibrated and verified by measurement of water quality data, the total nitrogen, total phosphorus, chlorophyll-a and transparency were selected to simulate, and concluded transport diffusion and spatial and temporal distribution of nutrients. Combined with the practical situation, from replenishment methods, replenishment frequency and changing lakes flexible structure, schemes on hydrodynamic condition and numerical simulation were put forward, and the modified effects of hydromatical condition and material transport diffusion of different schemes were studied. The results showed obvious spatial and temporal distribution of chlorophyll-a concentration which was between 0.035~0.105mg/L. Phytoplankton such as algae grow quickly,which was the peak period of algal bloom and water quality deterioration．Strategies such as increasing the hydraulic circulation and improving the inflow water quality would achieve good effects in water quality management.