L'oxygène dissous en Lagune Ebrié: Influences de l'hydroclimat et des pollutions

Dufour, P. and Slepoukha, M. (1975) L'oxygène dissous en Lagune Ebrié: Influences de l'hydroclimat et des pollutions. Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan, 6(2), pp. 75-118.

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Abstract

The hydrology of the Ebrie coastal lagoon in Abidjan area is summarized. The authors describe the oxygenation in that area during the two extreme seasons of the hydrological cycle: the low-water season (March-April) and the high-water season (Sept-Oct). The influences of the continental and oceanic waters, photosynthesis, exchanges with the atmosphere and pollution are considered. The oxigen consumption of primary organic pollution represents from 9 to 12% of the content of the waters that circulates in the area. It is geographically very heterogeneous. The central basin, swept by strong marine and fresh water currents, shows a rather high level of water oxygenation. In the peripheric bays, water circulation and mixing are less important and pollution accelerates the natural eutrophic processes. During the low-water season, a vertical stratification is responsible for a bottom anoxic layer and the deposit of reduced organic silts. On the contrary, supersaturations, up to 200%, are recorded on the surface layer. During the high-water season the break of the vertical stratification sets the loose reduced silts into suspension and partly reoxygenates the bottom waters. A classification of the different areas, based on the oxygen vertical profiles is proposed.

Item Type: Article
Title: L'oxygène dissous en Lagune Ebrié: Influences de l'hydroclimat et des pollutions
Personal Creator/Author:
CreatorsEmail
Dufour, P.
Slepoukha, M.
Journal or Publication Title: Documents Scientifiques, Centre de Recherches Océanographiques, Abidjan
Volume: 6
Number: 2
Page Range: pp. 75-118
Date: November 1975
Issuing Agency: Centre de Recherches Océanographiques, Côte d'Ivoire
Uncontrolled Keywords: Côte d'Ivoire; Lagune Ebrié; oxygen; water oxygenation; hydrology; water circulation
Subjects: Atmospheric Sciences
Ecology
Environment
Oceanography
Pollution
Item ID: 7973
Depositing User: Ms Maria Kalentsits
Date Deposited: 11 Mar 2012 08:50
Last Modified: 11 Mar 2012 08:50
URI: http://aquaticcommons.org/id/eprint/7973

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