磨盘山水库温度场的数值模拟

Numerical simulation of temperature fields in Mopanshan reservoir

基于EFDC建立水库水动力学模型进行流场、温度场、浓度场及生态过程的数值模拟是进行水库环境保护、管理及运行的有力工具.以磨盘山水库为研究对象,进行非稳态温度场数值模拟.结果表明:磨盘山水库水温全年均处于分层状态,库表分层现象最为明显,至库底分层减弱,库底水温变化平缓.4月垂向温差较小,6、7月形成表层温跃层,对于垂向传质具有一定程度的屏障作用,至9、10月份出现秋季翻滚,垂向掺混加强,对水质影响较大.因此,水库取水口深度应该随季节调整,丰水期至冬季时段,建议净水厂强化水处理工艺.

Numerical simulation of flow field, temperature field, concentration field and ecological process is a powerful tool for operation, management and environmental protection of reservoir based on EFDC＇, The hydrodynamic model is utilized to simulate the temperature field of Mopanshan reservoir under unsteady flow condition and all the numerical simulations are carried out. The results show that the reservoir is under the condition of thermal stratification in the whole year. In April the temperature difference in vertical is small. In June and July the water close to the surface forms a thermocline, which is a barrier of mass transfer in vertical. In September and October the mixing of water in different temperature layers is strengthened and it has a large effect on water quality. The study provides a reference for locating the water intake with seasons. It is suggested that water plants should enhance the preprocess in high water period in September and October.