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General Session 1: Physical oceanic processes: Dynamics and physical-biological-biogeochemical interactions |
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River plume responds to downwelling-favorable wind
GS1-24-S
Runqing Lv* , Xiamen university
Presenter Email: 22320161151281@stu.xmu.edu.cn
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| River plume is an important phenomenon in the estuary region, which is affected by various factors, and plays vital role in near-shore sediment transport and bio-distribution. River plume is a barrier to astrict the nutritional materials to the broad ocean and downwelling-favorable wind is supposed to be a mechanism to break out the barrier effect. Previous studies have been done to describe and explain the changing of a plume during a downwelling-favorable wind case, through numerical model and observed data. But most researches are based on a 2-D model and ignore the impact of alongshore transport. In this paper, we want to expound the evolution of a plume with the influence of downwelling-favorable wind based on a 3-D ideal estuary, using the Regional Ocean Modeling System (ROMS). As we can see from the result, the circulation of the vertical profile changes with the effects of wind. The vertical profile first shows an anticlockwise circulation, then, a clockwise circulation appears in the frontal region. With the impact of circulation and freshwater transport, the isohalines first becoming vertical then tilted. The along-shelf momentum is mainly balanced in semi-geographic and the cross-shelf momentum is mainly balanced in quasi-geographic. In this case, we calculate the time of the variation and the freshwater transport, using the method of potential energy and estuary circulation. The scale is well fixed with the numerical result. Moreover, we try to get the analytic resolution of the momentum equation. The result can clearly reflect the three layers of the cross-shore velocity. |
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