15 research outputs found
Sur l'origine par altération du substratum schisteux de la minéralisation chlorurée des eaux d'une nappe côtière sous climat semi-aride (Chtouka-Massa, Maroc)
L'aquifere des calcaires du Turonien (bassin du Tadla, Maroc). Alimentations locales et lointaines a partir de l'Atlas
INIST T 77425 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc
Caractérisation hydrogéochimique d'une nappe côtière en zone semi-aride, application au Souss amont (Sud-Ouest Marocain)
International audienc
Contamination of groundwater in irrigated fields under an arid climat, Souss-Massa plain, Morocco.
Characterization of Groundwater's Mineralization of the Coastal Aquifer of Agadir (Southwest of Morocco) : Distribution and Origins
Utilisation des données hydrochimique, isotopique et cartographique pour mettre en évidence l'impact de l'activité agricole sur la qualité des eaux souterraines : cas de la plaine côtière de Chtouka-Massa (Sud-ouest du Maroc)
International audienc
Nitrate Contamination of Groundwater in Irrigated Perimeters under Arid Climate (The Case of Souss-Massa Aquifer, Morocco)
The objective of this study was to clarify, the current status of alluvial aquifer in the Souss-Massa basin, where, the nitric pollution of groundwater is being increasing along the last decades. A multi-approach methodology using hydrogeology, nitrate concentrations, irrigation mode and Oxygen-18 and Deuterium isotopes data, was carried out to identify the sources of this pollution. According to the spatial distribution of nitrate contents, nitric pollution occurs mainly in the Chtouka-Massa plain. More than 36% of the sampled wells exceed the value of 50 mg L-1 which, constitutes the threshold value of nitrate concentrations for drinking water Moroccan standards. The groundwater in Souss plain is less polluted comparing to Chtouka-Massa. Only 7% of wells exceed the permitted level. The widespread distribution of high nitrate contents agrees with the distribution of irrigated areas, which can explain the major origin from agricultural fertilizers. High nitrate levels are associated with high δ18O values, clearly indicating that significant quantities of evaporated (isotopically enriched) irrigation water infiltrate along with fertilizer nitrate to the groundwater system. Different δ18O-NO3- trends suggest isotopically distinct, non-point source origins, which vary spatially and temporally, due to different degrees of evaporation/recharge and amounts of fertilizer applied