Gravity currents in rotating, wedge-shaped, adverse channels
Gravity currents in rotating, wedge-shaped, adverse channels
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旋转、楔形、逆流通道中的重力流
DOI：
10.1007/s10652-013-9285-4
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发表时间：
2013
影响因子：
2.2
通讯作者：
Cuthbertson A
中科院分区：
文献类型：
--
作者：
Cuthbertson A
结果是从一系列的参数实验和分析研究的行为密集的重力流沿着旋转，向上倾斜，楔形通道。高分辨率密度剖面测量在固定的交叉和沿通道位置揭示流出的底部重力流调整到准稳定，地转平衡的条件沿着通道，与流出层厚度和跨通道接口斜率显示与入口伯格数的比例为所有实验条件下测试。在无粘性、零位涡条件的假设下，开发了经典旋转水力学问题的一般解析解，以模拟通过三角形收缩的稠密水流，从而模拟所考虑的V形通道配置。从这个零PV模型的预测显示，提供良好的整体定量协议与实验测量下获得的水力控制条件下，在通道出口和亚临界条件下产生的沿着通道长度。测量和分析预测之间的定量差异主要归因于与所采用的零PV建模方法相关的假设和限制，以及在接近通道出口时流出特性的快速调整，其特征在于流出物的密度弗劳德数沿通道变化。
Results are presented from a series of parametric experimental and analytical studies of the behaviour of dense gravity currents along rotating, up-sloping, wedge-shaped channels. High resolution density profile measurements at fixed cross- and along-channel locations reveal the outflowing bottom gravity currents to adjust to quasi-steady, geostrophically-balanced conditions along the channels, with the outflow layer thickness and cross-channel interface slope shown to scale with the inlet Burger number for all experimental conditions tested. A general analytical solution to the classic rotating hydraulics problem has been developed under the assumption of inviscid, zero-potential-vorticity conditions to model dense water flow through a triangular constriction and thus simulate the vee-channel configurations under consideration. Predictions from this zero-PV model are shown to provide good overall quantitative agreement with experimental measurements obtained both under hydraulically-controlled conditions at the channel exit and for subcritical conditions generated along the channel length. Quantitative discrepancies between measurements and analytical predictions are attributed primarily to assumptions and limitations associated with the zero-PV modelling approach adopted, as well as the to the rapid adjustment in outflow characteristics as the channel exit is approached, as characterised by the along-channel variation in densimetric Froude number for the outflows.
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