Shelf Impact on Buoyant Coastal Current Instabilities
Shelf Impact on Buoyant Coastal Current Instabilities
复制标题
陆架对沿海浮流不稳定性的影响
DOI：
10.1175/jpo-d-11-016.1
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发表时间：
2012
影响因子：
3.5
通讯作者：
K. Béranger
中科院分区：
文献类型：
--
作者：
R. Pennel;A. Stegner;K. Béranger
本文研究了陆架坡度对沿岸浮力流线性稳定性和沿岸曲折和涡旋非线性形成的影响。作者认为一个简化的两层分层圆柱形几何形状的浮力表面流沿着海岸流动的密度较高的水，平底或陡峭的货架。模拟使用了欧洲海洋模拟核心（NEMO）海洋全球环流模型。这些模拟的初始状态是根据在相同配置下进行的实验室实验来定义的。实验室和数值计算结果之间的比较突出的动量扩散和初始扰动振幅的作用。作者的研究结果证实，地形参数To（陆棚坡度与海流等密度线坡度之比）是量化陆棚对表层海流线性和非线性动力学影响的相关参数。当B的进化.
AbstractThe impact of shelf slope on the linear stability of buoyant coastal currents and on the nonlinear formation of coastal meanders and eddies is investigated. The authors consider a simplified two-layer stratification in cylindrical geometry where a buoyant surface current flows along the coast above a denser water, with a flat bottom or steep shelves. Simulations were performed using the Nucleus for European Modelling of the Ocean (NEMO) ocean global circulation model. The initial state of these simulations was defined according to laboratory experiments performed in the same configuration. Comparisons between laboratory and numerical results highlight the role of momentum diffusion and of the initial perturbations amplitude. The authors’ results confirm that the topographic parameter To (ratio between the shelf slope and the isopycnal slope of the current) is the relevant parameter to quantify the shelf impact on the linear and nonlinear dynamics of the surface current. When the evolution of the b...