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Abstract
A semianalytic model is developed to describe the flow through an inlet between a lagoon and the sea due to a simple tide and the related morphological response of the inlet. The governing equation for the water level variation in the lagoon is derived from the continuity and momentum equations and then solved for quasisteady conditions yielding analytic expression for the main flowrelated properties such as lagoon amplitude, maximum and mean inlet velocity, tidal prism, and retention time. These quantities are expressed in nondimensional form, where the repletion coefficient is the main independent variable. A sediment balance model is formulated for the inlet that relates changes in the inlet crosssectional area to the difference between the longshore sediment transport and the transport through the inlet because of the tidal motion. This balance equation can be solved to yield the conditions at equilibrium as well as the evolution towards equilibrium or closure. The semianalytic model is employed in the balance equation allowing for a close coupling between inlet hydraulics and morphology. Investigation of inlet equilibrium revealed, similarly to the Escoffier curve, two equilibrium situations, one corresponding to stable conditions and one to unstable conditions. The leading parameters in the stability analysis are the repletion coefficient and the longshore transport rate normalized with a fictive inlet transport rate.
Original language  English 

Article number  103581 
Journal  Coastal Engineering 
Volume  155 
DOIs  
Publication status  Published  2020 Jan 1 
Subject classification (UKÄ)
 Oceanography, Hydrology, Water Resources
Keywords
 Analytic solution
 Equilibrium crosssectional area
 Inlet area evolution
 Inlet stability
 Keulegan model
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Dive into the research topics of 'Semianalytic model of tidalinduced inlet flow and morphological evolution'. Together they form a unique fingerprint.Projects
 1 Finished

Simulating Morphological Evolution at Coastal Inlets due to Waves and Currents
Nunes De Brito Junior, A., Larson, M., Hanson, H. & Fragoso, C. R.
2015/10/01 → 2020/04/01
Project: Dissertation