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从次小尺度海洋运动方程和运动近各向同性假定出发,本文给出高确定性的海洋湍流二阶矩闭合方程和特征量变化方程.这组方程描述波动、涡旋和环流等较大尺度运动对海洋湍流的剪切不稳定性生成机制.同时,基于海浪破碎是湍流海面生成主要机制的认识,本文按破碎海浪统计理论给出湍流特征量变化方程的海面边界条件,包括由破碎能量损耗和卷入深度分别确定的海面动能通量和动能耗散率.根据上层海洋湍流特征量方程的平衡解和关于动能耗散率的观测资料,本文得到海浪生湍流混合系数的解析估计.所得到的海浪生湍流动能耗散率与观测资料进行了定性与定量对比,混合系数与先前Prandtl混合长度理论估计的一致性检验.
Starting from the sub-small-scale oceanic motion equations and the near-isotropic assumptions of motion, this paper presents the high-deterministic second-order closed-loop equations of marine turbulence and the eigenvalues variation equations. This set of equations describes the large-scale The mechanism of shear instability of ocean turbulence is also discussed.At the same time, based on the understanding that the wave breaking is the main mechanism of turbulent sea surface generation, the paper presents the sea boundary conditions of the turbulent feature quantity variation equation according to the statistical theory of broken waves, And the depth of entrainment respectively.According to the equilibrium solution of the upper ocean turbulent characteristic equation and the observation data about the kinetic energy dissipation rate, an analytical estimate of the mixing coefficient of the sea surface turbulence is obtained. The correlation between the turbulent kinetic energy dissipation rate and observed data was qualitatively and quantitatively compared, and the consistency between the mixing coefficient and the previous Prandtl mixing length theory was tested.