Study On A Two-Dimensional, Laterally Averaged, Hydrodynamic Model To Three-gorges Reservoir Under The Different Scheduling Mode

After the Three Gorges Reservoir tributaries hydrological run a big change in reservoir tributary water quality deterioration, non-flood prone tributaries of the local waters outbreak "bloom" phenomenon. Because the high water level results in the decreases of the flow velocity and turbulence, which leads to the enrichment of nutrient and fast growth of algae. While in the non-flood season, the Three Gorges Power Station will be in peak load operation, which will benefit the water exchange between main stream and tributaries and increase the water turbulence and velocity. Therefore, the peak load operation will provide a new way to improve the water quality of the tributaries. One-dimensional hydrodynamic model is used in traditional research, the numerical simulation result can not reflect the deep reservoir significant vertical hydrodynamic characteristic. Based on this, study on a two-dimensional,laterally averaged, hydrodynamic model to three-gorge reservoir under different scheduling mode is necessary.Specific content and conclusion of the study are as follows:(1) Analysis of the CE-QUAL-W2 vertical two-dimensional hydrodynamic and water quality model's basic principles, functions, restrictions and benefits of the model. This article use CE-QUAL-W2 vertical two-dimensional hydrodynamic and water quality model simulate to a two-dimensional,laterally averaged, hydrodynamic model to three-gorge reservoir(2) The simulation analysis with no load uniform load operation discharge operation and the peak amplitude under different water reservoir. Data shows that compared with no load operation mode, the peak load regulating operation ways to improve the water velocity, strengthen the tributary of the uprising water exchange and mixing. But with the peak amplitude increase, water exchange volume and exchange synchronous speed is increased.(3) The simulation analysis water dynamic process of the three gorges reservoir under the condition operation mode and the same in different typical water. Data shows that, with the increase of water, the water velocity increasing, the tributary exchange volume uprising, to dilute the tributary pollutant concentration.(4) Simulate water dynamic process of three gorges reservoir under the same operation mode and different levels of regenerative. Data shows that compared with constant water level, water storage operation to shorten the water displacement put short time, strengthen the tributary, increased water exchange separately, improved water quality. And after the first storage, the tributaries water exchange is the strongest.