同时考虑余流和潮流的海洋模式开边界条件

为较真实地数值模拟浅海环流,需考虑潮流的作用,因在浅海潮混合和潮致余流对环流具有较重要的作用。为保证计算区域内水量流进和流出的平衡,开边界条件需以流速代替水位给出。但这样做必须首先验证开边界条件在以潮流和潮位给出的情况下,计算域内的潮汐和潮流是一致的,随后才能考虑潮流和余流的合成。能否在开边界上同时考虑余流和潮流,在数值上必须首先得到验证。该文设计一个理想海湾,应用ECOM模式,数值试验表明开边界条件用潮流替代潮位,计算域内计算结果是一致的;开边界上同时给出余流和潮流可成功地模拟计算域内的余流场的分布。该文结论对余流和潮流共存情况下海流的数值计算具有推广价值。

Open Boundary Condition Considered Residula Current and Tidal Current Simultaneously in Ocean Model

It's needed to consider the effect of tidal current in order to numerically simulate the circulation realisically in a shallow sea, because the tidal mixing and tide-induced residual current have an important effect on the circulation. It's needed to set the current speed for the open boundary condition in stead of set the water level in order to balance of water volume flowing in and out the calculated domain. First, we verify the consistent of the tide and tidal current in the calculated domain in the case of open boundary condition with tidal level and tidal current. Then we consider the composition of the residual current and tidal current. It's necessary to verify numerically that whether we can give out the open boundary condition with the composition of residual current and tidal current simultaneously. Applied the ECOM, the numerical experiment with the tidal current open boundary codition shows that results are consistent with the tidal level open boundary condition by designing an idealized bay. It is successful to simulate the distribution of residual current in the case of considering the residual current and tidal current at the open boundary simultaneously. The conclusion in this paper can be referenced for the numerical calculation of current in the case of composition of residual current and tidal current.