季调节深水大库全库区全年水温结构的模拟验证

Modeling of the water temperature structure in a large reservoir

应用环境流体动力学EFDC模型,以多年运行的二滩水电站水库水温实测资料为基础,对季调节峡谷深水型水库全库区、全年的水温结构变化进行模拟验证。结果表明,计算较好地获得了水库全库区纵向及垂向的水温分布,及其在季节性水文气象条件与水库调度条件耦合作用下的变化特征;揭示了在高温高辐射及水库泄洪联合作用下,垂向双温跃层结构的形成及发展过程。敏感性分析计算表明,夏季库区垂向双温跃层结构模拟的关键在于水体内部水温传导模式的选取及对由水库调度所形成的库区垂向流场特别是垂向流速梯度的精细模拟。

Based on the complete field observation dada of water temperature in the reservoir of Ertan Hydropower Station,an environmental fluid dynamic model was developed to predict the variation of water temperature in large reservoir with unsteady operation.The temporal and spatial characteristics of water temperature structure in reservoir can be well predicted.It is found that the key impact factor of the double thermocline is the couple action of climate factors and the effect of reservoir operation.Sensitivity analysis shows that the key point for simulating the double thermocline is the suitable selection of inner thermal transport model and the precise simulation of the velocity field in the veritcal direction due to reservoir operation.