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arXiv physics/9707022physics.flu-dynphysics.ao-ph
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浮力驱动的旋转边界流

Buoyancy driven rotating boundary currents

P. A. Yecko, S. P. Meacham

摘要:

边界流的结构形成从中等密度的水引入到一个旋转的,稳定分层的,两层的环境中进行了一系列的实验室实验,弗劳德数范围从0.01到1。准恒定电流的厚度和流向速度分布测量使用pH激活示踪剂(百里酚蓝),并发现比较有利的简化的解析解和数值模型。在分层背景中沿倾斜边界流动的电流在所有实验弗劳德数下都表现出鲁棒稳定性。这种稳定性与这种水流在垂直边界上流动或在均匀背景下沿斜坡流动的明确不稳定性形成鲜明对比。周围介质中存在的各种波动机制,通过波辐射对扰动的阻尼作用,可能解释了观测到的结构和海流的稳定性。

英文摘要:

The structure of boundary currents formed from intermediately dense water introduced into a rotating, stably stratified, two-layer environment is investigated in a series of laboratory experiments, performed for Froude numbers ranging from 0.01 to 1. The thickness and streamwise velocity profiles in quasi-steady currents are measured using a pH activated tracer (thymol blue) and found to compare favorably to simplified analytic solutions and numerical models. Currents flowing along sloping boundaries in a stratified background exhibit robust stability at all experimental Froude numbers. Such stability is in sharp contrast to the unequivocal instability of such currents flowing against vertical boundaries, or of currents flowing along slopes in a uniform background. The presence of a variety of wave mechanisms in the ambient medium might account for the slower and wider observed structures and the stability of the currents, by effecting the damping of disturbances through wave radiation.

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