A numerical study of horizontal dispersion in a macro tidal basin |
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| Authors: | Danya Xu Huijie Xue |
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| Institution: | (1) School of Marine Sciences, University of Maine, Orono, ME 04469-5706, USA;(2) Center for Environmental Sensing and Modeling (CENSAM) Singapore-MIT Alliance for Research and Technology (SMART), S16-05-08, 3 Science Drive 2, Singapore, 117543, Singapore; |
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| Abstract: | Tidal circulation in Cobscook Bay, a macro tidal basin, is simulated using the three-dimensional, nonlinear, finite element
ocean model, QUODDY_dry. Numerical particles are released from various transects in the bay at different tidal phases and tracked for several tidal
cycles. Initially, nearby particles in the main tidal channel experience a great deal of spreading and straining, and after
a few tidal cycles, they are separated in different parts of the bay. The fundamental mechanism for particle dispersion is
the chaotic advection that arises from long tidal excursions passing through many residual eddies. A loosely correlated, inverse
relationship between the two dimensionless parameters, ν (the ratio of the residual current to the tidal current) and λ (the ratio of the tidal excursion to the main topographic scale), can be constructed for large values of ν. Several Lagrangian statistical measures are used to quantify and distinguish dispersion regimes in different parts of Cobscook
Bay. It is found that the effective Lagrangian dispersion coefficient can be estimated using the product of the magnitude
of residual currents and the tidal excursion. |
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