ORIGINS OF SALINITY IN THE AQUIFERS OF SAHEL EL HAOUZIA,REGION OF DOUKKALA (WEST MOROCCO)
N. MDIKER. ; A. EL ACHHEB. ; A. YOUNSI. ; H. MARAH.
Chouaîb Doukkali University,
Faculty of Sciences, Department of Geology,
Laboratory Geoscience and Environmental Technologies,
BP:20,24000 El Jadida, Morocco
** National Center for Energy, Science and Nuclear Techniques (CNESTEN);
BP 1382, R.P.10001 - Rabat, Morocco.
The Sahel of El Haouzia, is part of the Moroccan Atlantic coastal plain and includes an aquifer system forming surface water contained in the sandy formations and clastic limestone of the Plio-Pleistocene and a deep-water table in the marly limestones of the Cenomanian.
The groundwater of the aquifer system of El Haouzia , are characterized by high levels of salts, with conductivities that vary between 2 to 7 ms / cm. This high salinity can, in the short time, affect the quality of the water and the economy of the region that is based primarily on agriculture and tourism which in recent years has undergone considerable development .
The study of the salinity of water by the chemical approach (Cl-, Br-) and isotopic (18O and 2H) reveal that the high salinities are related to a marine influence (proximity of the coastline: salt wedge, aerosols and sea spray), and to the leaching of the underlying evaporitic formations..
Keywords : Sahel El Haouzia, salinity, water table, salt wedge, isotope