| Reservoir, as the artificial system regulation for water storage and controlling of water resources, is an effective way to realize the reasonable development and utilization of water resources. Especially, in the most arid region, reservoir has become an important water source of drinking water. But in the process of operation, the influence of factors, such as water environment in and out of the reservoir leads to falling of reservoir water supply function. In addition, reservoir has the relatively closed condition, water retention time is longer, cycling of nutrients is disturbed. Large amounts of nitrogen and phosphorus discharging into water causes the rapid proliferation of algae, plankton. The above phenomenon leads to water eutrophication, affecting the safety of residents drinking water seriously. Therefore, seeking the measures to solve the problem of eutrophication is particularly important.This research regards reservoir in arid regions as the research background, selects eutrophication problem of reservoir as the main study content, applys total thought of environmental system analysis, determines the targeted technical route of study; Based on hydrodynamic model, and integrates the whole life of the reservoir eutrophication processes, establishs the reservoir eutrophication coupling model. Taking Fenhe Reservoir in Shanxi Province as the research carrier, it realizes the quantitative study of the reservoir eutrophication, reveals the law of diffusion of nutrients in Fenhe Reservoir; and puts forward the corresponding measures in view of the problem, achieves the goal of water quality comprehensive improvement of Fenhe Reservoir. This research has theoretical significance, but also has the use value.Several aspects of the research results are:(1)According to the water quality characteristics of reservoir and the flow characteristics in northern region, this research applys systematic thought, on the basis of hydrodynamic and water quality model, fully considers the influence of the reservoir eutrophication nutrients, plankton and other processes, develops a quantitative method of study on the reservoir eutrophication.(2)Comprehensive consideration of nutrients in water, dissolved oxygen, planktonic animals and plants and algae complex life activities process, based on the two-dimensional hydrodynamic model, integrated the hydrodynamic model and water quality model and the processes of life activity, this paper establishs the reservoir eutrophication coupling model.(3)Taking Fenhe Reservoir in Shanxi Province as the research vehicle, combined with the surrounding land and water environment, this research determines the simulation range; and on the basis of natural structure characteristics of the reservoir, establishs the triangle grid system, applys the smoothing technology to generate the corresponding reservoir numerical terrain; determining the model on the basis of the definite conditions, chooses several representative scene, simulates the total nitrogen, total phosphorus, reveals the nutrient diffusion regularity and space-time distribution rule of Fenhe Reservoir under different wind conditions.(4)Taking<The surface water environment quality standard>(GB3838-2002) as the basis of eutrophication evaluation reference, it establishs the reservoir eutrophication evaluation standards; puts forward the corresponding measures, including controlling of the pollution sources, establishing ecological engineering, etc.This study establishs reservoir eutrophication coupling model, and applying to the study of Fenhe Reservoir; analyzes the hydrodynamic condition and pollutant diffusion regularity of Fenhe Reservoir systematically. For pollution prevention and control of Fenhe Reservoir, the rational use of water resources has been provided. |
