Abstract
A tidally-induced frontal system regularly develops in a small area off Newport News Point in the lower James River, one of the tributaries of the Chesapeake Bay. In conjunction with the front, a strong counter-clockwise eddy develops on the shoals flanking the northern side of the channel as the result of tidal interaction with the local bathymetry and estuarine stratification. A three-dimensional hydrodynamic model was applied to simulate the eddy evolution and front development, and to investigate time-varying circulation and material transport over a spring-neap tidal cycle. The model results show that variation of tidal range, together with periodic stratification-destratification of the estuary, has a significant impact on the residual circulation of the lower James River. The net surface water circulation, which takes the form of a counterclockwise eddy on the Hampton Flats, is stronger during neap tide than during spring tide. Strong stratification and weak flood current during neap tide results in a dominant ebb flow at the surface, which delays flooding within the channel and advances the phase lead of flood tide on shoals adjacent to the channel, thus increasing both period and intensity of the eddy. Front development in the area off Newport News Point provides a linkage between shoal surface water and channel bottom water, producing a strong net upriver bottom transport. The existence of the vertical transport mechanism was independently demonstrated through tracer experiments. The impact of the dynamics on larval dispersion was investigated through a series of model simulations of the movement of shellfish larvae over multiple tidal cycles following their release at selected bottom sites. These results show that eddy-induced horizontal circulation and vertical transport associated with the frontal system are important mechanisms for the retention of larval organisms in the James River.
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Literature Cited
Blumberg, A. F. andG. M. Mellor. 1987. A description of a three-dimensional coastal ocean circulation model, p. 1–19.In N. S. Heaps (ed.), Three-Dimensional Coastal Ocean Models, Coastal and Estuarine Science, No. 4. American Geophysical Union, Washington, D. C.
Byrne, R. J., A. Y. Kuo, R. L. Mann, J. M. Brubaker, E. P. Ruzecki, P. V. Hyer, R. J. Diaz, andJ. H. Posenau. 1987. Newport Island: An Evaluation of Potential Impacts on Marine Resources of the Lower James River and Hampton Roads. Special Report in Applied Marine Science and Ocean Engineering No. 283. Virginia Institute of Marine Science, Gloucester Point, Virginia.
Galperin, B., L. H., Kantha, S. Hassis, andA. Rosati. 1988. A quasi-equilibrium turbulent energy model for geophysical flows.Journal of Atmospheric Science 45:55–62.
Garrison, L. P. 1997. The influence of physical transport and nutritional stress on the zoeae of estuarine crabs. Ph.D. Dissertation, School of Marine Science, College of William and Mary, Gloucester Point, Virginia.
Hamrick, J. M. 1992a. A Three-Dimensional Environmental Fluid Dynamics Computer Code: Theoretical and Computational Aspects. Special Report in Applied Marine Science and Ocean Engineering No. 317. Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, Virginia.
Hamrick, J. M. 1992b. Estuarine environmental impact assessment using a three-dimensional circulation and transport model, p. 292–303.In M. L. Spaulding (ed.), Proceedings of the 2nd International Conference on Estuarine and Coastal Modeling, Coastal and Estuarine Sciences, No. 4. American Society of Civil Engineers, New York.
Hamrick, J. M. 1996. User’s Manual for the Environmental Fluid Dynamics Computer Code. Special Report in Applied Marine Science and Ocean Engineering No. 331. Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, Virginia.
Kuo, A. Y., R. J. Byrne, J. M. Brubaker, andJ. H. Posenau. 1988. Vertical transport across an estuary front, p. 93–109.In J. Dronkers and W. van Leussen (eds.), Physical Processes in Estuaries. Springer-Verlag, Berlin.
Kuo, A. Y., R. J. Byrne, J. V. Hyer, E. P. Ruzecki, andJ. M. Brubaker. 1990. Practical application of theory for tidal-intrusion fronts.Journal of Waterway, Port, Coastal, and Ocean Engineering 116(3):341–361.
Malouf, R. E. andV. M. Bricelj. 1989. Comparative biology of clams: Experimental tolerances, feeding and growth, p. 23–31.In J. J. Manzi and M. Castagna (eds.), Clam Mariculture in North America. Elsevier, Amsterdam.
Mellor, G. L. andT. Yamada. 1974. A hierarchy of turbulence closure models for planetary boundary layers.Journal of Atmospheric Sciences 31:1791–1806.
Mellor, G. L. andT. Yamada. 1982. Development of a turbulence closure model for geophysical fluids problems.Reviews of Geophysics and Space Science 20(4):851–875.
Moustafa, M. Z. andJ. M. Hamrick. 1994. Modeling circulation and salinity transport in the Indian River Lagoon, p. 381–395.In M. L. Spaulding (ed.), Proceedings of the 3rd International Conference on Estuarine and Coastal Modeling. American Society of Civil Engineers, New York.
Park, K., A. Y. Kuo, J. Shen, andJ. M. Hamrick. 1995. A Three-Dimensional Hydrodynamic-Eutrophication Model (HEM3D): Description of Water Quality and Sediment Process Submodels. Special Report in Applied Marine Science and Ocean Engineering No. 327. Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, Virginia.
Ruzecki, E. P. andW. J. Hargis, Jr. 1988. Interaction between circulation of the estuary of the James River and transport of oyster larvae, p. 255–278.In B. J. Neilson, A. Y. Kuo, and J. M. Brubaker (eds.), Estuarine Circulation. The Humana Press, Clifton, New Jersey.
Shen, J., G. M. Sisson, A. Y. Kuo, J. D. Boon, andS. C. Kim. 1998. Three-dimensional numerical modeling of the tidal York River system, Virginia, p. 495–510.In M. L. Spaulding and A. F. Blumberg (eds.), Proceedings of the 5th International Conference on Estuarine and Coastal Modeling. American Society of Civil Engineers, Washington, D. C.
Sisson, G. M., J. Shen, A. Y. Kuo, J. D. Boon, S. C., Kim, andT. Stockhausen. 1997. VIMS Three-Dimensional Hydrodynamic-Eutrophication Model (HEM-3D): Application of the Hydrodynamic Model to the York River System. Special Report in Applied Marine Science and Ocean Engineering No. 327. Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, Virginia.
Yang, Z. 1996. Variational inverse methods for transport problems. Ph.D. Dissertation, School of Marine Science, College of William and Mary, Gloucester Point, Virginia.
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Shen, J., Boon, J.D. & Kuo, A.Y. A modeling study of a tidal intrusion front and its impact on larval dispersion in the James River estuary, Virginia. Estuaries 22, 681–692 (1999). https://doi.org/10.2307/1353055
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DOI: https://doi.org/10.2307/1353055