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Water 2018, 10(5), 569; https://doi.org/10.3390/w10050569

Lagoon Sediment Dynamics: A Coupled Model to Study a Medium-Term Silting of Tidal Channels

Dipartimento Politecnico di Ingegneria e Architettura, University of Udine, 33100 Udine, Italy
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Received: 29 March 2018 / Revised: 23 April 2018 / Accepted: 23 April 2018 / Published: 27 April 2018
(This article belongs to the Section Hydraulics)
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Abstract

The silting of tidal channels is a natural process that affects several shallow lagoons and makes it difficult to navigate, requiring regular maintenance interventions. This phenomenon is the result of the complex non-linear interaction between tidal currents and wave motion. In this work, the morphodynamic evolution of the Marano and Grado lagoon is investigated by means of a two-dimensional horizontal (2DH) morphological-hydrodynamic and a spectral coupled model. An innovative procedure to reproduce the overall bathymetric changes in the medium term and, in particular, the volumes deposited inside channels, is presented. An average year with a sequence of winds and tides acting over that time was reconstructed, carrying out cross correlation techniques and spectral analyses of measured data. The predicted morphological evolution matches the annual dredged volumes in the lagoon critical branches and shows the distribution of erosion and deposition of cohesive sediments according to spatially variable values of critical shear stress. View Full-Text
Keywords: morphodynamic modelling; tidal channels; sediment transport; wave-current interaction; critical stress; wind distribution morphodynamic modelling; tidal channels; sediment transport; wave-current interaction; critical stress; wind distribution
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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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Petti, M.; Bosa, S.; Pascolo, S. Lagoon Sediment Dynamics: A Coupled Model to Study a Medium-Term Silting of Tidal Channels. Water 2018, 10, 569.

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