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A Numerical Study of the Circulation and Drifter Trajectories in Cobscook Bay

A Numerical Study of the Circulation and Drifter Trajectories in Cobscook Bay. Danya Xu School of Marine Sciences, University of Maine, Orono, ME Acknowledgment Huijie Xue & Stephen Cousins, SMS, University of Maine David A.Greenberg, Bedford Institute of Oceanography

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A Numerical Study of the Circulation and Drifter Trajectories in Cobscook Bay

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  1. A Numerical Study of the Circulation and Drifter Trajectories in Cobscook Bay Danya Xu School of Marine Sciences, University of Maine, Orono, ME Acknowledgment Huijie Xue & Stephen Cousins, SMS, University of Maine David A.Greenberg,Bedford Institute of Oceanography Randy Losier, St.Andrews Biological Station HeidiLeighton & Will Hopkins, Cobscook Bay Resource Center Students of Shead High School, Eastport The Study is funded by MOSAC, Maine DEP and Maine Sea Grant Office.

  2. Introduction Brooks & Churchill,1992

  3. Early Study:Brooks,1992,1999

  4. Early Study:Panchang,1997

  5. Early Study:Greenberg, 2004

  6. Model Description • Ocean model Quoddy_dry:(D.Lynch, 1996, D.Greenberg,2004) 3D, fully nonlinear, free surface, finite element Turbulence closure scheme User specifications of surface/lateral ocean boundaries Wetting/Drying • Lagrangian particle-tracking model Drog3ddt: (Brian Blanton,UNC,CH) (http://www.opnml.unc.edu/Particle_Tracking/part_track) Only include advection term Particles can move freely in all 6 directions

  7. Model Mesh 11,750 nodes19,557 elements21 vertical  layerL ~ [35m- 3.88km]

  8. Model Topography

  9. GoMOOS Wind Data

  10. Deer Island Deer Island I. I Campobello Is. Campobello Is. Eastport Deer Island I. I Campobello Is. Eastport

  11. Aug.05, 2004 13:10-04:00 GMT

  12. Summary & Future Work • Fundamental mechanisms for exchanges between Cobscook Bay and the adjoining bay are strong flooding, ebbing tidal currents. • Complexity of coastal line and topography produce several small scale eddies and eddy dipoles. • Model predicted current and tracer trajectories are consistent with observation. • More experiments are going to be conducted to examine the effects of multi-tidal constituents and baroclinicity. • Residence time will be estimated for various parts of Cobscook Bay.

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