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            <title xml:lang="en">Modelling the Effects of Oyster Tables on Estuarine Tidal Flow</title>
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                <term xml:lang="en">wettingdrying areas</term>
                <term xml:lang="en">Aber Wrac'h estuary</term>
                <term xml:lang="en">western Brittany</term>
                <term xml:lang="en">tidal flow</term>
                <term xml:lang="en">Telemac</term>
                <term xml:lang="en">Chézy coefficient</term>
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                <term xml:lang="en">aquaculture impact</term>
                <term xml:lang="en">aquaculture impact numerical model Chézy coefficient Telemac tidal flow wettingdrying areas Aber Wrac'h estuary western Brittany</term>
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              <p>Oyster farming may impact the estuarine tidal circulation with a series of effects on environmental conditions and cultures’ growth. Hydrodynamic numerical models set up in estuaries integrated the presence of oyster structures by simply increasing the bottom friction coefficient over farming areas. However, for elevated oyster tables in tidal environments, such default calibration ignored the temporal variations of the friction coefficient between the conditions of submerged or unsubmerged structures. Thus, an original formulation of the Chézy coefficient was here proposed to integrate these modulations. Assessed against measured and predicted vertical velocity profiles on a 1/2 scaled model, this formulation was implemented in a simulation of the tidal circulation within the Aber Wrac’h estuary (Brittany, France). Particular attention was dedicated to the changes induced on the current magnitudes and sediment transport. Oyster tables were found to impact current magnitudes in the vicinity of elevated structures, with major differences at times of local peak flood and ebb. These modifications were characterised by (i) a reduction of current magnitudes over oyster farming areas and (ii) a tidal-flow acceleration on both sides of these structures. Increased sediment transport was, therefore, expected in the vicinity of these cultures, with potential implications on seabed morphology and water quality.</p>
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