Seasonal Variation of Thermocline Depth: Consequence on Nutrient Availability in the Ivorian Coastal Zone

Faced with the threat of overfishing in Africa, this study was initiated in the coastal zone of Côte d'Ivoire to understand the nutrients availability as function of variation in the depth of thermocline. Data from the ocean bank, World Ocean Atlas (WOA), were used in the ODV software during the twelve months of 2009 taken at 5.5°W/4.5°N (station coordinates). ODV software has allowed to make seasonal analysis, from vertical profiles and latitudinal analysis from the coast toward the sea through some parameters such as temperature, nitrate, phosphate and oxygen. The depth of thermocline, nitracline, phosphacline and oxycline was determined by the seasonal analysis. To evaluate the enrichment intensity of coast towards the sea, latitudinal analysis was investigated using the section profiles (1°S/5°N coordinates). The main results have shown not only the variation in the depth of the thermocline, but also the variation of nitracline, phosphacline and oxycline at different marine seasons. During the cold season, there was an ascent of the thermocline over the surface of water and a strong enrichment from the coast to the sea especially in August. While in hot season, the thermocline was lower and its stability has favoured the stratification of the water column, which prevents the enrichment of the oxygenated surface layer. Analysis of relationships shows that nutrient elements and oxygen change polynomially with temperature

Cartographie De La Sensibilite Aux Maladies Environnementales Respiratoires Dans Le District Sanitaire De Koumassi-Port-Bouët-Vridi (Sud De La Côte d’Ivoire)

In Côte d’Ivoire morbidity causes are related to diseases such as malaria, diarrhea, and acute respiratory infections (ARI), which are constantly evolving. Koumasi and Port-Bouet are the most affected municipalities in the country. This study aims to find environmental determinants of spatial distribution of the ARIs and identify the most sensitive areas to take action for prevention and effective control and targeted in order to reduce the prevalence of ARI. To achieve this goal, we have identified environmental factors associated with the occurrence of ARI. Different environmental and cartographic data were integrated into a GIS. A multi-criteria analysis was performed to determine the environmental parameters that expose more people to the occurrence of the IRA and the weights of these parameters. The combination of exposure maps was used to map the sensitivity to IRA. Multi-criteria analysis revealed that refuse dumps have the highest influence in the occurrence of the disease, followed by industrial facilities and permanent wastewater. The ARI sensitivity map obtained shows that neighborhoods Nord-est 2 and Zone industrielle in Koumassi municipality are most susceptible to ARI. In the municipality of Port-Bouet sensitivity is more pronounced at Vridi canal and Vridi 3. Special attention should therefore be granted these neighborhoods