Study on nutrient distribution and interaction with sediments in a macro-tidal estuary |
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| Institution: | 1. Université Cadi Ayyad/Ecole Supérieure de Technologie d''Essaouira, Km 9, Route d''Agadir, BP 383 Essaouira Aljadida, Morocco;2. Ecobio, UMR 6553, Université de Rennes 1, Campus de Beaulieu, 263 avenue du Général Leclerc, 35042 Rennes Cedex, France;3. Sorbonne Universités, UPMC, Univ Paris 06, CNRS, EPHE, IPSL, UMR 7619 Metis, 4 place Jussieu, 75252 Paris, Cedex 05, France;4. Laboratoire des Sciences du Climat et de l''Environnement, Laboratoire mixte CNRS-CEA, Av. de la Terrasse, 91190 Gif sur Yvette, France |
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| Abstract: | An integrated hydro-environmental model has been developed for predicting the distribution of nutrients in estuarine and coastal waters. This paper also reports on an application of the model to the Loughor Estuary in the UK, which has a high tidal range. The horizontal two-dimensional model considers the hydrodynamic, sediment transport, dissolved oxygen and nutrient cycling processes. In particular, the effect of sediment suspension and deposition on the nutrient distribution in the water column has been included in the model. A TVD-MacCormack scheme has been adopted to numerically solve the coupled partial differential equations. Field surveys and laboratory experiments in connection with the Loughor Estuary were conducted to obtain measured data for model calibration and verification. It was found that the linear isotherm model gave a good approximation of the adsorption/desorption processes over the range of nitrogen and phosphorus concentrations measured in the natural estuary. Through experiments on the collected soil samples, the salinity-dependent partition ratios between the adsorbed and dissolved nutrients were determined. The results of the established model showed good agreement with the measured data. Finally, the model was used to examine the implications of changing the sewage effluent discharge scheme on the nutrient distributions in the estuary. |
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