三峡水库香溪河库湾水温结构及其对水动力影响的数值模拟

Numerical Simulation of Water Temperature Structure and Its Impact on Hydrodynamics in Xiangxihe Bay of Three Gorges Reservoir

利用Delft3D数值模拟软件,建立三峡水库香溪河库湾z坐标系下三维水动力-水温耦合数学模型,根据2009年实测资料,通过数值模拟分析了库湾在各月的垂向和水平温度分布特征,研究了水温结构对库湾水动力的影响。结果表明,香溪河上游在枯水期垂向水温存在弱分层现象;而库湾水体在4～5月和汛期（6～8月）,在距离河口18～30km范围内始终保持稳定分层,但在蓄水期（9～10月）和枯水期（11月～次年2月）仅在库湾底部存在水温分层,并给出了香溪河库湾及河口全年分层异向流动的演变过程,研究结果可为香溪河库湾水生态环境保护提供参考。

Three-dimensional hydrodynamic and water temperature model in zcoordinates was established to simulate the water temperature stratification in Xiangxihe bay by using Delft3 D.Based on the observed data of 2009,this paper simulated the characteristics of vertical and horizontal distribution of monthly water temperature,and researched the impact of water temperature structure on hydrodynamics of reservoir bay.The results show that there is weak vertical temperature stratification in the upstream of the Xiangxihe river in the dry season.During the discharge period and flood season,the water body of Xiangxihe bay which is 18 km to 30 km away from the estuary could always keep stable temperature stratification.But in the storage period and dry season,the temperature stratification only exists at the bottom of reservoir bay.Moreover,the evolution of the density-stratified flow throughout the year is obtained.Therefore,the results could provide scientific basis for safety management of ecological environment in Three Gorges Reservoir.