Physico-chemical assessment of the Nador lagoon's water quality - North of the Eastern Morocco - after the opening of the new inlet [Evaluation physico-chimique de la qualité de l'eau de la lagune de Nador - Nord du Maroc oriental - après l'ouverture de la nouvelle passe]

This study was carried out to evaluate the impact of recent developments (closure of the old inlet and opening of a new one) on the water quality of the lagoon of nador,northeast of morocco. twelve hydrological parameters were selected to characterize the lagoon (temperature,conductivity,ph,dissolved oxygen content,oxygen saturation percentage,nitrates,nitrites,phosphates,suspended materials,mineral materials,organic materials,depth). the principal component analysis (pca) and hierarchical cluster analysis (hca),were used to study the distribution of variables and the correlations between physicochemical parameters and sampling points. the result of this study shows that,the nador lagoon was characterized during our study period by a spatial organization:five parameters homogeneous,namely ph,temperature,conductivity,dissolved oxygen content and the percentage of oxygen saturation.seven parameters heterogeneous,namely depth,particulate organic matter,inorganic particulate material,suspended matter,phosphates,nitrates and nitrites.the concentrations of the nutritional elements are low in confined areas,far from the pass,namely,both ends of beni ansar and kariat arakman for hydrodynamic reasons of significant exchange rate of water masses that occurs at the pass. these low levels,were observed also in tirakaâe and chaâla regions that receive domestic discharge waste.