关键词: 水位调度;浮游藻类;水质生态模型;影响预测;红枫湖;高原湖库水源地;

Abstract: Most of the drinking water sources in plateau lakes and reservoirs are facing serious eutrophication, and the key to solving this problem is to explore efficient ecological algae control technology.Water level regulation is one of the most economical and effective regulation methods in reservoir phytoplankton regulation.Based on MIKE 3,this paper constructs a 3D hydrodynamic-water quality ecological coupling model for lakes and reservoirs, and carries out a prediction study on the impact of water level regulation on phytoplankton in the water source areas of plateau lakes and reservoirs.The study shows that the water level has an obvious regulating effect on the growth and accumulation of algae in the lake area.Among them, the flow field in the Hongfeng Lake area increased significantly during the sudden drop of water level, and the flow velocity in the connecting section between the South Lake and the North Lake generally increased up to more than 0.3m/s, while the disturbance caused by this hydrodynamic force had obvious effect on breaking the algae structure and reducing the algae biomass in the lake area, and the algae concentration in southern area of Hongfeng Lake decreased significantly.In addition, the long-term stable operation at low water levels in the reservoir area has a very adverse impact on algae prevention and control.

Key words: water level regulation; phytoplankton; ecological model of water quality; impact prediction; Hongfeng Lake; drinking water sources in plateau lakes and reservoirs;