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dc.contributor.authorShetye, S.R.
dc.contributor.authorGouveia, A.D.
dc.date.accessioned2009-05-08T12:17:51Z
dc.date.available2009-05-08T12:17:51Z
dc.date.issued1992
dc.identifier.citationEstuarine, Coastal and Shelf Science, Vol.35; 113-126p.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/3147
dc.description.abstractShallow estuaries often show tidal asymmetry of flood-dominance in which duration of the flood is shorter and its peak discharge larger than the corresponding values during ebb. A simple analytic model for this phenomenon is proposed. Noting that in tidal propagation in shallow, narrow estuaries, the dominant terms in the momentum balance are pressure gradient and friction, only these two terms are preserved in the model and linearize the friction. The resulting governing equation for tidal propagation is a diffusion equation with the diffusion coefficient a function of the area and the wetted perimeter of the channel cross-section. The nature of variation of both the area and the perimeter with tidal height depends on the channel geometry, and for most channels the former is more important. Solutions derived using a perturbation expansion scheme for channels with simple geometries, show that the variation of the diffusion coefficient over a tidal cycle leads to flood-dominance. This and other characteristics of the solution compare favourably with the features seen in observations
dc.language.isoen
dc.publisherAcademic Press
dc.rightsCopyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subjecttidal flow
dc.subjectestuarine dynamics
dc.subjectgeomorphology
dc.subjectebb currents
dc.subjectflood currents
dc.subjecttidal propagation
dc.subjectsimulation
dc.subjectmathematical models
dc.titleOn the role of geometry of cross-section in generating flood-dominance in shallow estuaries
dc.typeJournal Article


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