TITLE:
Mapping of the Sedimentary Facies of the Bottom of the Ouladine Lagoon in Grand-Bassam (Ivory Coast_West Africa)
AUTHORS:
Bi Kassia Francis Koffi, Samassy Rokyatou Epouse Yeo, Kouassi Kouamé Alfred
KEYWORDS:
Substrate, Lithology, Silts, Sediments, Barrier Beach, Mouth, Granulometric, Estuarine, Saltation
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.10 No.10,
October
31,
2022
ABSTRACT: The Ouladine lagoon has an irregular bottom lined
with different substrates. The lithological characteristics make it possible to
observe sediments ranging from silts to sands and mixed sediments of variable
color. These different fractions have varying proportions. The coarse fraction
(>63 μm) has percentages ranging from 0 to 77% and the
fine fraction ( μm) from 22.46 to 100% in the different sediments
collected. The minority fraction of fine sands occupies the northern banks
where the greatest depths of the section parallel to the coastal strip are
observed. On the other hand, the sandy fractions occupy the southern shore up
to the vicinity of the Azuretti mangrove island. This sandy fraction is also
present on almost the entire section from the Comoé-Ebrié lagoon confluence to
the closed mouth. The grain size characters of the sediments, such as the
diagram of the classification coefficient So and the mean Mz, show
well-classified sands. These sediments are deposited in a slightly agitated
environment coming mainly from dunes and rivers. The sands of the estuarine
complex were emplaced by saltation for most samples and by rotation.