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采用宽度平均立面二维水动力模型CE-QUAL-W2,对紫坪铺水库水温结构进行了数值模拟,运用库区实测资料进行了模型的参数率定及验证。库区及下泄水温的计算值与实测值吻合良好,显示模型能较好地模拟库区垂向水温分层的形成发展过程,以及升温期电站下泄水温变化,证实该模型对紫坪铺水库的水温模拟是适用的,也可为同类型水库提供参考。经参数灵敏度分析,发现水温模拟对模型中的风遮蔽系数与动态光遮蔽系数最为敏感,其余参数影响不明显,可取模型默认值。其中风遮蔽系数增大,风速加大,水库表层温度降低,水库垂向混合作用增强,温跃层下移,水温分层明显减弱,库底水温明显提升;动态光遮蔽系数增大,入射的太阳辐射增强,水库上层40m水体温度升高,中下层水体温度无明显变化。
The water temperature structure of Zipingpu Reservoir was numerically simulated by using the width-averaged two-dimensional hydrodynamic model CE-QUAL-W2. The parameters of the model were calibrated and validated by the measured data in the reservoir area. The calculated values of reservoir water temperature and discharge temperature are in good agreement with the measured values. The results show that the model can simulate the formation and development of vertical water temperature stratification in the reservoir area and the variation of water temperature at the power station during heating period. Water temperature simulation is applicable, but also for reference for the same type of reservoir. According to the sensitivity analysis of the parameters, it is found that the water temperature simulation is the most sensitive to the wind shielding coefficient and the dynamic light shielding coefficient in the model, and the other parameters have no obvious influence, so the model default value is desirable. The wind shielding coefficient increased, the wind speed increased, the reservoir surface temperature decreased, the reservoir vertical mixing effect enhanced, the thermocline moved down, the water temperature stratification significantly weakened, the reservoir bottom water temperature increased significantly; dynamic light shielding factor increased, incidental The solar radiation is enhanced, the temperature of the upper 40m water body of the reservoir rises, and the temperature of middle and lower water bodies has no obvious change.