Abstract:

CEQUALW2, a twodimensional, laterally averaged, hydrodynamic model, was applied to simulate the water temperature structure in Zipingpu reservoir. Model parameters were adjusted during calibration and the simulation results were compared with the observed measurements in site. The simulation results of area of reservoir and effluent flow were compared favorably with the observed measurements, showing that the model can simulate the process of formation and development in vertically stratified reservoir and changes of water temperature for power station during temperature raising period. The model is suitable to be applied to simulate vertical water temperature structure in Zipingpu reservoir, which also can provide reference for the simulations of vertical water temperature in similar reservoirs. Through sensitivity analysis of parameters, it is found that windsheltering coefficient and dynamic shading coefficient's effects on simulation of vertical water temperature are most obvious. The rest parameters have little effects on simulation of vertical water temperature, so they can be the model's default values. The influences of windsheltering coefficient and dynamic shading coefficient on temperature structure in reservoir are analyzed. It is shown that the windsheltering coefficient’s increase, will cause that wind speed increases, reservoir surface temperature decreases, reservoir vertical mixing action is enhanced, thermocline moves down, water temperature stratification is weakened and temperature bottom rises; Dynamic shading coefficient's increase, causes the enhancement of incidence of solar radiation, upper 40 m water body's temperature rises, without obvious changes of temperature in middle and bottom water body