Semiempirical Model for Initial Displacement of Salt Water Wedge in a Bar-Blocked Estuary
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 133, Issue 4
Abstract
The interaction of continuous freshwater flow from an upstream basin into a bar-blocked estuary is investigated following ideas previously proposed by Debler and Imberger. The interface point, defined as the point of confluence between the initial saltwater wedge and the freshwater, is considered to be characteristic of the interaction between the water bodies. The previous semiempirical model of Coates and Guo has been reconsidered on the basis of realistic wedge shapes obtained from physical and numerical experiments. The approach considers conservation and conversion of energies in the dynamic environment. The present approach enabled the writers to obtain a semiempirical model that matches published experimental data fit for the initial phase of the wedge displacement. It is observed that the new model complements the earlier relationship of Coates and Guo for predicting the salt wedge dynamics for the initial phase of the interaction.
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Acknowledgments
The writers acknowledge the authorities of Indian Institute of Technology Madras, India, for providing necessary facilities for the study. They would also like to acknowledge the reviewers for the critical comments and suggestions to derive the limitations of the present formulation [Eq. (10)].
References
Behera, M. R. (2005). “Simulation of multi-fluid systems (MFS) using interface tracking techniques.” MS thesis, Indian Institute of Technology Madras, Chennai, India.
Coates, M. J., and Guo, Y. (2003). “The salt wedge position in a bar-blocked estuary subject to pulsed inflows.” Estuarine Coastal Shelf Sci., 58(1), 187–196.
Coates, M. J., Guo, Y., and Davies, P. A. (2001). “Laboratory model studies of flushing of trapped saltwater from a blocked tidal estuary.” J. Hydraul. Res., 39(6), 601–609.
Debler, W., and Armfield, S. (1997). “The purging of saline water from rectangular and trapezoidal cavities by an overflow of turbulent sweet water.” J. Hydraul. Res., 35(1), 43–62.
Debler, W., and Imberger, J. (1996). “Flushing criteria in estuarine and laboratory experiments.” J. Hydraul. Eng., 122(12), 728–734.
Kurup, G. R., Hamilton, D. P., and Patterson, J. C. (1998). “Modeling the effect of seasonal flow variations on the position of salt wedge in a microtidal estuary.” Estuarine Coastal Shelf Sci., 47(2), 191–208.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 133 • Issue 4 • July 2007
Pages: 264 - 267
Copyright
© 2007 ASCE.
History
Received: Jun 7, 2005
Accepted: May 20, 2006
Published online: Jul 1, 2007
Published in print: Jul 2007
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