Using a composite grid approach in a complex coastal domain to estimate estuarine residence time
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Abstract
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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Using a composite grid approach in a complex coastal domain to estimate estuarine residence time |
| Series title | Computers & Geosciences |
| DOI | 10.1016/j.cageo.2009.11.008 |
| Volume | 36 |
| Issue | 7 |
| Year Published | 2010 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 15 p. |
| First page | 921 |
| Last page | 935 |
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