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Water 2018, 10(3), 237; https://doi.org/10.3390/w10030237

On the Hydrodynamic Geometry of Flow-Through versus Restricted Lagoons

1
Department of Civil Engineering, University of Patras, University Campus, 265 00 Patras, Greece
2
Department of Civil Engineering, Technological Educational Institute of Western Greece, Megalou Alexandrou 1, 263 34 Patras, Greece
*
Author to whom correspondence should be addressed.
Received: 19 January 2018 / Revised: 16 February 2018 / Accepted: 17 February 2018 / Published: 25 February 2018
(This article belongs to the Special Issue Turbulence in River and Maritime Hydraulics)
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Abstract

The classification of a lagoon as a restricted lagoon is shown to depend not solely on its geometry but also on the tidal hydraulics. By numerically simulating the tidal exchange of two lagoons of similar geometrical dimensions, the Nidova lagoon and the Papas lagoon, in Western Greece, subject to very similar tidal forcing, applied to the two tidal inlets in the first case and three in the second, very different residence times are found, namely 2.5 days for the Nidova and 25–30 days for the Papas lagoon. This large difference is attributed to the fact that whereas the Papas lagoon functions as a typical restricted lagoon, in which the water renewal is achieved by mixing in the lagoon of the tidal prism water exchanged within a tidal cycle, the Nidova lagoon functions as a flow-through system because of the differential arrival of the tide at its two tidal inlets. It is suggested that this way of enhancing the flushing rate of a lagoon be considered, whenever possible, when creating a new tidal inlet to the lagoon. View Full-Text
Keywords: flow-through system; tidal inlets; residence time; coastal lagoon; MIKE 3 FM (HD & TR); MIKE 21 FM (HD) flow-through system; tidal inlets; residence time; coastal lagoon; MIKE 3 FM (HD & TR); MIKE 21 FM (HD)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fourniotis, N.T.; Horsch, G.M.; Leftheriotis, G.A. On the Hydrodynamic Geometry of Flow-Through versus Restricted Lagoons. Water 2018, 10, 237.

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