Abstract
This paper focuses on the analysis of the flow field of Danjiangkou Reservoir under the action of wind stress. Based on the analysis of the annual wind field data of Danjiangkou Reservoir, the three-dimensional hydrodynamic model of Danjiangkou Reservoir was established. The distribution of water flow field in the reservoir area under five different wind directions and two different wind speeds was studied. The simulation results were compared with the flow field without wind. The results show that when the wind speed in the reservoir area is 3.3m/s, the surface velocity and flow direction change less under the same wind conditions as the potential flow direction. Under the wind condition opposite to the potential flow direction, the reservoir area is locally generated. The small circulation and surface flow are more disordered; when the wind speed reaches 10.0m/s, under the same wind condition as the potential flow direction, the surface velocity of the reservoir area increases significantly. Under the wind condition opposite to the direction of the potential flow, a stable counterclockwise circulation is generated, and the wind direction dominates the surface layer. seriously affecting the flow field distribution in the reservoir area. The research results in this paper can provide support for the reservoir in the formulation of emergency water pollution emergency strategy and the formulation of real-time scheduling plan.
Highlights
Danjiangkou Reservoir is the water source of the Middle Route of the South-to-North Water Transfer Project, which spans the Hubei and Henan provinces, and is composed by the Hanjiang reservoir area in Hubei and the Danjiang reservoir area in Henan[1] The average annual reservoir water volume of this reservoir is 39.5 billion m3, and the average annual area of the reservoir exceeds 700 km2[2]
The safety of water quality in the reservoir area is crucial[3, 4] Since the flow field is the main hydrodynamic factor for the migration of pollutants and suspended materials in the reservoir area, studying the impact of wind on the Danjiangkou Reservoir water flow field is important for the water quality simulation in the reservoir area
Danjiangkou Reservoir is located in the middle and upper reaches of the Han River and is distributed in Danjiangkou City of Hubei Province and Nanyang City of Henan Province. It is divided into Hanjiang Reservoir Area and Danjiang Reservoir Area
Summary
Danjiangkou Reservoir is the water source of the Middle Route of the South-to-North Water Transfer Project, which spans the Hubei and Henan provinces, and is composed by the Hanjiang reservoir area in Hubei and the Danjiang reservoir area in Henan[1] The average annual reservoir water volume of this reservoir is 39.5 billion m3, and the average annual area of the reservoir exceeds 700 km2[2]. The Danjiangkou Reservoir is the water source for water diversion from the Middle Route of the South-to-North Water Transfer Project. With the help of environmental fluid dynamics model (EFDC), the effects of five different wind directions and two different wind speeds on the water flow field of Danjiangkou Reservoir under normal design water transfer conditions are studied. The research results in this paper can provide support for reservoirs in the formulation of emergency water pollution emergency strategies and real-time scheduling schemes
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