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The role of eddies on pathways, transports, and entrainment in dense water flows along a slope

机译：涡流在沿斜坡的浓水流中的路径，运输和夹带中的作用

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摘要

The flow of dense water along slopes has been investigated in several numerical investigations based on the Dynamics of Overflow Mixing and Entrainment (DOME) setup. In the present study, we try to obtain further insight into the pathways, transports, dynamics, and entrainment of such flows by performing numerical model studies with horizontal grid sizes of 10 km and 2.5 km. It is found that the rates of descent of the plumes along the slope are robust to the horizontal resolution. With a high vertical resolution and a bottom boundary condition that facilitates the representation of Ekman drainage, the plumes will follow a deeper path than when using quadratic bottom drag with a constant drag coefficient. In the results from the studies with 2.5 km horizontal grid, ambient lighter water inside anticyclonic eddies is sucked downward. Due to Ekman drainage, this water flows outwards near the bottom and underneath denser plume water. The water column around the core of the anticyclonic eddies becomes unstable, and ambient water is entrained into the plume. Due to the increased mixing and entrainment in the eddy-permitting regime, there is a substantial increase in the along slope plume transports when we reduce the grid size from 10 km (the laminar case) to 2.5 km (the eddy-permitting case).
机译：基于溢流混合和夹带（DOME）动力学的几个数值研究已经研究了沿斜坡的稠密水流。在本研究中，我们试图通过对水平网格大小为10 km和2.5 km的数值模型研究来获得对此类流的路径，传输，动力学和夹带的进一步了解。可以发现，羽流沿斜率的下降速率对水平分辨率具有鲁棒性。垂直分辨率高，底部边界条件便于表示埃克曼排水，与使用具有恒定阻力系数的二次底部阻力时相比，羽流将走得更深。在2.5 km水平网格的研究结果中，反气旋涡内部的较轻的水被向下吸入。由于Ekman排水，该水在底部附近和较浓的羽状水下方向外流动。反气旋涡旋核心周围的水柱变得不稳定，周围的水被夹带到羽流中。由于在允许涡流的情况下增加了混合和夹带，当我们将网格尺寸从10 km（层流情况）减小到2.5 km（允许涡流的情况）时，沿斜坡羽流的运输量显着增加。

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