Rises in the water level of the Roya, the closest river to Monaco, are followed by a lowering of salinity in the coastal area that is all the more intense and synchronous as we near the shore and the river mouth, as well as at the sea surface. By comparing the mean salinity six miles offshore with that of the bay, between 1976 and 1983, it is found that the fresh water volume contained in the first metre below the surface of the bay is equivalent to the cumulative flow of the Roya in three hours. Studies of lagged correlations between the flow of the Roya and salinity measured in the bay and further offshore indicate that during hot and calm weather the mixing area between fresh water and sea water spreads to a greater extent seawards and is more pronounced at the sea surface. But if variations of salinity observed from one sampling cruise to another at the sea surface and near the shore are explained by fluctuations in the daily flow of the Roya and neighbouring torrents, those at a greater distance can be explained only by a more general climatic influence, applied to fresh water of more distant origin.
Auteurs du document :
Rapaire, Jl, Prieur, L
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Thème (issu du Text Mining) :
MILIEU NATUREL, TYPOLOGIE DES EAUX
Oceanologica Acta (0399-1784) (Gauthier-Villars), 1992 , Vol. 15 , N. 3 , P. 245-253