Les flux de sels nutritifs dans l'estuaire de la Seine (France); rôle et importance du bouchon vaseux au cours du mélange estuarien

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Abstract
Dissolved nutrient loadings from the Seine River as it enters the Seine Estuary were examined for the period 1976–79; these are directly related to river flow, except for more constant phosphate loading. Mean annual inputs of dissolved inorganic nutrients attain 37 600 t/yr for silica, 10 300 t/yr for phosphorus and 66 000 t/yr for nitrogen. Nutrients samples were also collected along the estuary during March 1978 and March and September 1979; results show that in the estuary the dissolved nutrients are generally mixed in a conservative way; a few exceptions can be noticed — addition of silicate to the bottom water during high river flow periods and production of ammonia and nitrites during the summer months. Results also indicate that particulate phosphorus and particulate organic nitrogen can be trapped within the area of the turbidity maximum but this process affects only a small fraction of the total inputs of nutrients from the river. Finally it is suggested that high turbidity levels and rapid flushing time are two significant factors limiting the primary production and the removal of dissolved nutrients within the estuary.

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