A laterally averaged nonhydrostatic ocean model
A laterally averaged nonhydrostatic ocean model
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DOI：
10.1175/jtech-1674.1
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发表时间：
2004-12-01
影响因子：
2.2
通讯作者：
Kelley, DE
中科院分区：
文献类型：
--
作者：
Bourgault, D;Kelley, DE
提出了动态狭窄区域内分层流动的横向平均非静力模型。横向平均产生了二维模型的计算效率，同时保留了与可变区域宽度相关的一些影响，例如通过收缩通道的流动加速。该模型既可以在流体静力学模式下运行，也可以在非流体静力学模式下运行，在后一种情况下，如果流动近似为流体静力学，它将迅速收敛。通过一系列日益复杂的测试用例说明了该模型的优点和缺点。与实验室观测结果的并列比较表明，该模型能够模拟非静力流动的结构，包括剪切不稳定性和颠覆内波，差异主要表现在过渡到三维湍流时。类似的结果在不列颠哥伦比亚省奈特湾的分层基流中得到了应用。该模型再现了被认为对该系统具有动力学重要性的非静力特征，包括大振幅背风波的产生和剪切不稳定性。
A laterally averaged nonhydrostatic model for stratified flow in dynamically narrow domains is presented. Averaging laterally yields the computational efficiency of a two-dimensional model, while retaining some effects associated with variable domain width, such as flow acceleration through contracting channels. The model may be run in both hydrostatic and nonhydrostatic modes, and in the latter case it converges rapidly if the flow is approximately hydrostatic. The model's strengths and weaknesses are illustrated with a series of test cases of increasing complexity. Side-by-side comparisons with laboratory observations show the ability of the model to simulate the structures of nonhydrostatic flows, including shear instabilities and overturning internal waves, with discrepancies becoming apparent mainly for transition to three-dimensional turbulence. Similar results are demonstrated in an application to the stratified sill flow in Knight Inlet, British Columbia. The model reproduces nonhydrostatic features thought to be dynamically important to this system, including the generation of large-amplitude lee waves and shear instabilities.