集合平均方法的建立及海洋动力系统耦合作用的性质分析

Multi-fold Set Average Method and Its Application in the Analysis of the Interaction Characteristics of Ocean Dynamic System

不同海洋动力过程之间的相互作用决定了海洋系统内部的结构,外观表征上则反映了海洋动力要素的空间及剖面精细化分布与演变特征,海洋动力系统相互作用理论愈来愈成为支撑海洋耦合数值模式与数值预报发展的重要基础。不同于Reynolds尺度平均概念,基于局域平稳均匀统计意义下的集合平均可易于实现集合层级和系统划分。在此基础上提出了一种实用的集合平均方法,分析了不同海洋动力过程之间的相互作用机理,包括大尺度动力过程对中、小尺度过程的输运、剪切生成作用,以及后者对前者的混合作用。重点揭示了湍流、波动对涡旋/环流的输运通量剩余量主要分量所起的作用,探讨了波动强剪切生成湍流的能量贡献效应等性质,为海浪-海流耦合实用模块的研发及数据资料处理提供设计方法。

The interaction among different marine dynamic processes determines internal structure of marine system,and its appearance reflects the fine distribution and evolution characteristics of marine dynamic elements in space and along sections.The interaction theory of ocean dynamic system has become an important foundation for the improvement of ocean coupled numerical models and prediction.Differentiated from the concept of Reynolds scale averaging,set average that is based on ergodic sample can easily achieve hierarchy and system division.Based on this,a generalized set average method is proposed for the analysis of interaction mechanism among different marine dynamic processes,including the transport and shear generation of large-scale dynamic processes to mesoscale and small-scale processes as well as the mixing effect of the latter on the former.This article highlighted the role of turbulence and waves on major components of residual advection transport to eddy and circulation,and studied the energy contribution effects of the turbulence generated by wave shear.A design of set average scheme based on special processing of integral is provided for the development of practical wave-current coupling module and data processing.