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L’analyse spatio-temporelle des parametres physico-chimiques des eaux du lac Labion dans le systeme lagunaire ivoirien, a ete aborde dans un contexte de variabilite climatique. L’objectif est de caracteriser la physico-chimie des eaux au cours des saisons climatiques. Pour y parvenir, une analyse hydrologique a ete realise a partir de mesure in situ des parametres pH, Temperature, Conductivite electrique, Oxygene dissous, Matieres en suspension, Transparence et Turbidite. Ces parametres ont ete mesures a l’aide d’un multi-parametre. Celui-ci est mis a l’eau et les resultats s’affichent a l’ecran. Seule la transparence a ete mesure a l’aide du disque de Secchi. La temperature (31 °C) indique des eaux relativement chaudes. Quant au pH, il varie du neutre (6,79) a alcalin (8,99). La conductivite moyenne sur le lac est de 40 μS/cm. Les eaux sont bien oxygenees (7 a 8 mg/L) et presente peu de matieres en suspension. L’analyse en composante principale montre une forte correlation (r > 0,7) entre les variables temperature, oxygene, pH et conductivite. Ces resultats mettent en evidence deux (02) mecanismes qui sont a l’origine des forcages naturel et artificiel. Il s’agit du mecanisme de la photosynthese occasionnant une bonne oxygenation des eaux et du mecanisme de pollution traduisant une forte turbidite.Mots cles : Lac, saison climatique, parametre, mecanisme, evolution.   English Title: Physico-chemical characterization of the waters of a lake system of the ivorian coastal cordon: case of Lake LabionThe spatio-temporal analysis of the physicochemical parameters of the waters of Lake Labion in the Ivorian lagoon system was tackled in the context of climate variability. The objective is to characterize the physico-chemistry of the waters during the climatic seasons. To achieve this, a hydrological analysis was carried out using in situ measurement of the parameters pH, Temperature, Electrical conductivity, Dissolved oxygen, Suspended matter, Transparency and Turbidity. These parameters were measured using a multi-parameter. It is launched and the results are displayed on the screen. Only transparency was measured using the Secchi disk. The temperature (31 °C) indicates relatively warm waters. As for the pH, it varies from neutral (6.79) to alkaline (8.99). The average conductivity on the lake is 40 μS / cm. The waters are well oxygenated (7 to 8 mg / L) and have little suspended matter. The principal component analysis shows a strong correlation (r> 0.7) between the variables temperature, oxygen, pH and conductivity. These results highlight two (02) mechanisms which are at the origin of natural and artificial forcings. This is the mechanism of photosynthesis causing good oxygenation of water and the pollution mechanism reflecting high turbidity.Keywords: Lake, climatic season, parameter, mechanism, evolution.

Caractérisation physico-chimique des eaux d’un système lacustre du cordon littoral ivoirien : cas du lac Labion