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The impact of bathymetry, geometry, and ambient currents on the dynamics of coastal buoyant outflows.

机译:测深,几何形状和环境水流对沿海浮力流出动力学的影响。

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摘要

Results from an experimental laboratory study of large-scale coastal buoyant outflows are presented. Such a flow can be described as a buoyant outflow exiting an estuary or strait into a dense ambient fluid. The system is rotating such that Coriolis effects are important: thus, the buoyant outflow exits the estuary as a front in approximate thermal wind balance. The characteristics and evolution of the buoyant outflow are examined, and dynamical arguments are presented that describe the behavior of the outflow.; Buoyant outflows are examined in a number of configurations: the coastal bathymetry and bay exit geometry are varied in a simplified but realistic manner to assess the effect such variations have on the buoyant outflow. It is found that these boundary conditions have a major impact on the fate of the outflow. A buoyant outflow interacting with the bottom is found to be strongly controlled by the steepness of the coastal bathymetry, or bottom slope. This control manifests itself by determining the width of the buoyant outflow, which affects the downshelf velocity and mixing within the current. Currents isolated from the bottom by a layer of ambient oceanic fluid are found to evolve independent of the bottom slope. However, the geometry of the bay exit has a large affect upon the development of such outflows. The configuration of the bay exit may cause flow separation: such separation may be significant enough that a recirculation region may form. This recirculation region, or bulge, tends to consume a large percentage of the source volume flux, resulting in a flow characterized by a large recirculating eddy, and a relatively weak downshelf coastal current. Lack of recirculation, however, produces a strong coastal current with little offshore growth. Thus, the fate of the freshwater discharge is controlled very dramatically by the source exit conditions.; Finally, the impact of an ambient current on a surface-advected buoyant outflow is examined. Such along shelf ambient currents are common, although typically weak, in nature. However, it was found that even a weak ambient current may have a large impact on the development of a buoyant outflow, greatly altering the magnitude of the upshelf transport, downshelf transport, and storage, of the source fluid in the region.
机译:给出了对大规模沿海浮力流出进行实验性实验室研究的结果。这种流动可被描述为从河口或海峡进入稠密的环境流体的浮力流出。系统在旋转,因此科里奥利效应很重要:因此,浮力流出口以近似热风平衡的形式从河口流出。检查了浮力流出的特征和演变,并提出了描述流出行为的动力学论据。浮力流出有多种配置方式:沿海测深法和海湾出口几何形状以简化但现实的方式变化,以评估这种变化对浮力流出的影响。发现这些边界条件对资金流出的命运有重大影响。发现与底部相互作用的浮力受到海岸测深法或底部坡度的强烈控制。该控制通过确定浮力流出的宽度来体现出来,这会影响下架速度和水流内的混合。发现通过一层周围海洋流体与底部隔离的洋流的发展与底部坡度无关。但是,海湾出口的几何形状对此类流出物的发展影响很大。托架出口的配置可能会导致流分离:这种分离可能非常重要,以至于可能形成回流区域。该再循环区域或凸起倾向于消耗大量的源体积通量,从而导致以大的涡流和相对较弱的陆架海流为特征的流动。但是,缺乏再循环会产生强劲的沿海水流,而离岸增长很少。因此,淡水排放的命运受到水源出口条件的极大控制。最后,检查了环境电流对表面平移浮力流出的影响。本质上,这种沿架子的环境电流是常见的,尽管通常较弱。然而,已经发现,即使是弱的环境电流也可能对浮力流出的发展产生很大的影响,从而极大地改变了该区域中源流体的上架输送,下架输送和存储的幅度。

著录项

  • 作者

    Avicola, Gregory S.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Engineering Marine and Ocean.; Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 300 p.
  • 总页数 300
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋工程;海洋物理学;
  • 关键词

  • 入库时间 2022-08-17 11:45:00

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