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Open AccessArticle

Characterisation of the Water Renewal in a Macro-Tidal Marina Using Several Transport Timescales

LIENSs, La Rochelle University, 2 rue Olympe de Gouges, 17000 la Rochelle, France
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Water 2019, 11(10), 2050; https://doi.org/10.3390/w11102050
Received: 11 June 2019 / Revised: 24 September 2019 / Accepted: 26 September 2019 / Published: 30 September 2019
In this paper, we investigate the water renewal of a highly populated marina, located in the south-west of France, and subjected to a macro-tidal regime. With the use of a 3D-numerical model (TELEMAC-3D), three water transport timescales were studied and compared to provide a fully detailed description of the physical processes occurring in the marina. Integrated Flushing times (IFT) were computed through a Eulerian way while a Lagrangian method allowed to estimate Residence Times (RT) and Exposure Times (ET). From these timescales, the return-flow (the fraction of water that re-enters the marina at flood after leaving the domain at ebb) was quantified via the Return-flow Factor (RFF) and the Return Coefficient (RC) parameters. The intrinsic information contained in these parameters is thoroughly analysed, and their relevance is discussed. A wide range of weather-marine conditions was tested to provide the most exhaustive information about the processes occurring in the marina. The results highlight the significant influence of the tide and the wind as well as the smaller influence of the Floating Structures (FS) on the renewal. Besides, this study provides the first investigation of the water exchange processes of La Rochelle marina. It offers some content that interest researchers and environmental managers in the monitoring of pollutants as well as biological/ecological applications. View Full-Text
Keywords: marina; water renewal; transport timescales; return-flow; macro-tidal; wind influence; floating structures marina; water renewal; transport timescales; return-flow; macro-tidal; wind influence; floating structures
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Huguet, J.-R.; Brenon, I.; Coulombier, T. Characterisation of the Water Renewal in a Macro-Tidal Marina Using Several Transport Timescales. Water 2019, 11, 2050.

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