垂向一维水温模型在东江水库中的应用研究

Application of one-dimensional vertical temperature model in Dongjiang Reservoir

针对现有垂向一维水温模型研究中缺少对模型关键参数和边界条件敏感性的系统分析,以东江水库为例,开展了垂向一维模型在湖泊型水库水温模拟中的适用性研究。研究结果表明:东江水库库区斜温层变化主要受气象条件控制,年内下泄水温过程稳定,模型能够较好模拟出垂向水温结构演变及下泄水温过程特征,与实测结果吻合良好;表层水温计算对水气热通量参数较为敏感,垂向扩散系数是影响垂向水温结构模拟的关键参数;同时,不同精度系列的气象过程不改变水库的整体热量收支,对水温结构基本无影响。

As the existing researches on the one - dimensional vertical water temperature model lacks systematic sensitivity analysis of key parameters and boundary conditions, with Dongjiang Reservoir as a case, this paper studies the applicability of one -dimensional vertical water temperature model in water temperature simulation of lake - like reservoirs. The research results show that the thermocline changes are mainly controlled by meteorological conditions and the temperature of the water discharge process is stable. The model can well simulate the characteristics of vertical water temperature stratification evolution and the tem- perature variation in the water discharge, and the simulation results coincide with the observed data. The surface water temperature calculation is relatively sensitive to the moisture thermal flux; and the vertical diffusion coefficient is a critical parameter influencing the simulation of the vertical water temperature. Besides, the meteorological boundary conditions of different accuracy series do not change the total heat budget of the reservoir and have no influence on the water temperature structure.