三峡水库香溪河库湾潮成内波数值模拟

针对三峡水库香溪河库湾水温分层所产生的水生态环境问题,建立了考虑水体表面风应力及热交换的水动力与水温相互耦合3维数学模型,根据实测定解条件,数值模拟证明了香溪河库湾水体具有季节性水温分层特征,水库调峰运行将使河口水体产生"潮汐式"往复运动,并在库湾引发潮成内波;数值模拟给出了潮成内波作用下库湾水温和流速垂向分布随时间的演化,成功捕捉到不同水深处水温波动以及水体上下层运动方向相反的交替流现象。研究成果表明内波对于水体水动力及水温分布具有显著影响,激发和利用内波,可望起到抑制水温层化、改善水体水生态环境的作用。

Numerical Simulation of Internal Waves Generation by Tidal Flow in Xiangxi Bay of the Three Gorges Reservoir

A well validated three-dimensional hydrodynamic and water temperature model considering water surface wind stress and heat exchange was proposed to simulate the water temperature stratification and water ecological environment problems in Xiangxi Bay,after the impoundment of Three Gorges Reservoir.The numerical results showed that the water temperature stratification occurs in spring and summer in Xiangxi Bay.The "tidal movement" in Xiangxi Mouth and the internal waves generated by "tidal flow" are caused by the peak shaving operation of Three Gorges Reservoir.The water temperature and vertical distribution of velocity vary with time,which are induced by the internal waves.The phenomena of water temperature fluctuations at different depth and the upper and lower flow in the opposite direction are captured successfully.The results revealed that the internal waves have remarkable effect on hydrodynamic and water temperature distribution,and the excitation and utilization of the internal waves are expected to inhibit water temperature stratification and to improve water ecological environment.