Qualité et comportement de l'aquifère crayeux sur le littoral Nord-Pas-de-Calais

Along the Nord-Pas-de-Calais coast, the chalk aquifer is in contact with the sea and the aquiferous Quaternary formations forming the coastal plain (‘Bas-Champs’ and sand-dunes). To obtain information on the behaviour of the chalk aquifer in the ‘Bas-Champs’ area, a hydrochemical analysis has been carried out on the available drillings and completed by a geophysical survey. The results thereby obtained provide a much clearer image of the phenomena governing the groundflows and their interactions around the littoral limit of the chalk aquifer.