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Using a composite grid approach in a complex coastal domain to estimate estuarine residence time

机译:在复杂的沿海地区使用复合网格方法估算河口停留时间

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We investigate the processes that influence residence time in a partially mixed estuary using a three-dimensional circulation model. The complex geometry of the study region is not optimal for a structured grid model and so we developed a new method of grid connectivity. This involves a novel approach that allows an unlimited number of individual grids to be combined in an efficient manner to produce a composite grid. We then implemented this new method into the numerical Regional Ocean Modeling System (ROMS) and developed a composite grid of the Hudson River estuary region to investigate the residence time of a passive tracer. Results show that the residence time is a strong function of the time of release (spring vs. neap tide), the along-channel location, and the initial vertical placement. During neap tides there is a maximum in residence time near the bottom of the estuary at the mid-salt intrusion length. During spring tides the residence time is primarily a function of along-channel location and does not exhibit a strong vertical variability. This model study of residence time illustrates the utility of the grid connectivity method for circulation and dispersion studies in regions of complex geometry.
机译:我们使用三维循环模型研究影响部分混合河口停留时间的过程。研究区域的复杂几何形状对于结构化网格模型不是最佳的,因此我们开发了一种新的网格连接方法。这涉及一种新颖的方法,该方法允许以有效的方式组合无限数量的单个网格以生成复合网格。然后,我们将这种新方法应用于数值区域海洋建模系统(ROMS),并开发了哈德逊河河口区域的复合网格,以研究被动示踪剂的停留时间。结果表明,停留时间是释放时间(春季vs.小潮),沿通道位置和初始垂直位置的强大函数。在潮汐潮汐中,在中盐侵入长度处,在河口底部附近的停留时间最大。在春季潮汐期间,停留时间主要是沿通道位置的函数,并且没有很大的垂直变化。停留时间的模型研究说明了网格连通性方法在复杂几何区域中的环流和扩散研究中的实用性。

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