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首页> 外文期刊>Journal of Physical Oceanography >Shelf Cross-Shore Flows under Storm-Driven Conditions: Role of Stratification, Shoreline Orientation, and Bathymetry
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Shelf Cross-Shore Flows under Storm-Driven Conditions: Role of Stratification, Shoreline Orientation, and Bathymetry

机译：风暴驱动条件下的陆架跨岸流：分层，岸线方向和测深的作用

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Numerical simulations are used to study the response of Long Bay, South Carolina, a typical coastal embayment with curved coastline located on the South Atlantic Bight, to realistic, climatologically defined, synoptic storm forcing. Synoptic storms, consisting of cold and warm fronts as well as tropical storms, are used as forcing under both mixed and stratified initial conditions. The analysis focuses on the development of cross-shore shelf circulation and the relative contributions of regionally defined cross-shore winds and alongshore bathymetric variation. The simulation results show that, under stratified conditions, the regionally defined offshore-directed wind component promotes upwelling during the developing stage of the cold front and enhances mixing during the decaying stage. No significant effect is found for warm front and tropical storm forcing conditions. Net cross-shore transports are induced at the southern and northern sides of the embayment that have opposing signs. Besides the surface and bottom Ekman transports, geostrophic transport due to alongshore shelf bed slope and horizontal advection are found to be important contributors to cross-shore flow development. Sea level variability along the curved coastline is driven by the regional alongshore wind, but a spatial variability is identified from the locally defined components of along- and cross-shore winds controlled by coastline orientation.
机译：数值模拟用于研究南卡罗来纳州长湾（一种位于南大西洋海岸线上的弯曲海岸线的典型沿海堤防）对逼真的，气候学定义的天气风暴强迫的响应。由冷锋和暖锋以及热带风暴组成的天气风暴在混合和分层的初始条件下均被用作强迫。分析的重点是跨海陆架循环的发展以及区域定义的跨海风和沿岸测深的相对贡献。模拟结果表明，在分层条件下，区域限定的海上定向风分量在冷锋发展阶段促进了上升流，在衰落阶段促进了混合。对于暖锋和热带风暴强迫条件，没有发现明显影响。在隔离区的南侧和北侧产生净的跨海运输，其迹象相反。除了表面和底部的埃克曼输运，还发现由于沿岸架子床的倾斜和水平对流而产生的地转运动是跨岸水流发展的重要因素。沿着弯曲海岸线的海平面变化是由区域性沿海风驱动的，但空间变化是从由海岸线方向控制的沿岸和跨岸风的局部定义分量中识别出来的。

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