水闸调控对河流水质—水生态过程影响研究

Research on Impact of Sluice Regulation on River's Water Quality and Water Ecological Process

为探求水闸调度对河流水质-水生态过程的驱动作用和浓度变化规律,以沙颍河干流槐店闸为例,基于MIKE 11模型平台构建了闸控河段水质-水生态数学模型,模拟分析了不同水闸调度情景下水体中化学需氧量、溶解氧、总磷(TP)、总氮(TN)和藻类(PCY)的变化,对比分析了水闸上游Ⅳ断面和下游Ⅴ断面TP、TN和藻类的模拟结果。结果表明,在不同水闸调度情景下,河流的水位、流量等水动力条件发生变化,使得水体中营养物质的浓度也发生变化,从而影响藻类生长,使其呈现不同的变化趋势,说明可通过改变水闸调度方式对河流水质—水生态过程产生影响。

In order to study the driving power and concentration variation in the process of river quality and water ecology affected by sluice regulation, the MIKE 11 model was taken as a platform to build the water quality and water ecology model of river reaches controlled by sluice. And by application of the model, the Huaidian sluice was taken for an instance to simulate the concentration changes of chemical oxygen demand, dissolved oxygen, total phosphorus（TP）, total nitrogen（TN）and algae（PCY） under different sluice scheduling scenarios. By comparing the simulation results of TP, TN and PCY in the upstream fourth section and the downstream fifth section, the analysis revealed that changes of hydro dynamic conditions, such as water level and discharge et al, can arouse the concentration changes of nutrients in water, which will lead to different growth tendencies of the algae. Finally, the author got such a viewpoint that the sluice scheduling has impact on the river quality and water ecology.