On the dynamics of internal waves in the deep ocean
On the dynamics of internal waves in the deep ocean
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深海内波动力学研究
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
D. Olbers
中科院分区：
文献类型：
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作者：
P. Müller;D. Olbers
考虑了影响随机内波场演化的动力学过程。如果内波场的统计特性随空间和时间缓慢变化，这些动力学过程可以被视为自由线性场局部稳态的小扰动。然后，波场的时间演化由辐射传递方程来控制，该方程描述波场沿着波群轨迹的作用密度谱的变化。描述这些变化的源函数由控制波能的产生、传递和耗散的所有过程的叠加确定。源函数的某些项，即对应于可膨胀过程的那些项，可以通过使用弱相互作用概念严格地导出。其他条款，相应的非膨胀过程，这是由强非线性动力学局部，不能完全确定。对于内波场可以用WKBJ近似充分描述的情况，给出了一个相当完整的源项列表。这些源项的评价是困难的，部分原因是其复杂的功能结构，部分原因是因为所涉及的地球物理场还没有充分了解。这些源项已被详细评估的简要回顾，并讨论其影响的能量平衡的内波场。
The dynamical processes affecting the evolution of a random internal wave field are considered. If the statistical properties of the internal wave field vary slowly with space and time, these dynamical processes can be treated as small perturbations about the local steady state of the free linear field. The time evolution of the wave field is then governed by a radiative transfer equation describing changes in the action density spectrum of the wave field along wave group trajectories. The source function describing these changes is determined by the superposition of all processes governing the generation, transfer, and dissipation of wave energy. Some terms of the source function, those corresponding to expansible processes, can be derived rigorously by using weak interaction concepts. Other terms, corresponding to nonexpansible processes which are governed locally by strongly nonlinear dynamics, cannot be determined completely. For the case where the internal wave field can adequately be described in the WKBJ approximation, a rather complete list of source terms is presented. The evaluation of these source terms is difficult partly because of their complicated functional structure and partly because the geophysical fields involved are not sufficiently known. Those source terms which have been evaluated in detail are briefly reviewed, and their implications on the energy balance of the internal wave field are discussed.