Bilan des flux de matières particulaires et dissoutes du Sassandra à Gaoulou pont (Côte d’Ivoire)

Agbri, Lako; Bamba, Siaka Barthélémy; Doumouya, Inza; Savané, Issiaka

doi:10.4314/scinat.v7i2.59944

Cited by 3 publications

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“…Contrairement à la Mé, les parts en MO dans l'Agnéby sont supérieures à celles des matières minérales hormis le mois d'avril correspondant aux premières pluies qui remobilisent les suspensions issues des premières pluies qui lessivent les sols dénudés ou qui ont été labourés. Ces pluies emportent une partie du matériel détritique disponible pour le transport particulaire (Agbri et al, 2010). Cette observation est aussi valable pour la Mé.…”

Section: Résultats Matières En Suspension (Mes)unclassified

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2023

JABs, J. Appl. Biosci.

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Section: Résultats Matières En Suspension (Mes)unclassified

Untitled

2023

JABs, J. Appl. Biosci.

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“…A l'instar des autres écosystèmes aquatiques ivoiriens (Kouakou et al, 2015 ;Gnonsoro et al, 2016 ;Kadjo et al, 2016) (Agbri et al, 2010).…”

Section: Introductionunclassified

Prédiction de l’évolution spatio-temporelle du fer à l’exutoire d’un fleuve tropical : cas du fleuve Sassandra à Gaoulou (Côte d’Ivoire)

Yao¹,

Agbri²,

Bamba³

et al. 2017

Int. J. Bio. Chem. Sci

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La modélisation de l′évolution spatio-temporelle du fer à l′exutoire du fleuve Sassandra (la station hydrométrique de Gaoulou) a fait l′objet de cette étude. Pour ce faire, il a été utilisé le modèle hybride « ACP-PMC ». Deux scénarios ont été étudiés : la modélisation statique du fer et la modélisation dynamique du fer. La première partie de cette étude a été consacré à la recherche des paramètres d′entrée du perceptron multicouche (PMC) par l′analyse en composante principal (ACP). Les résultats obtenus ont permis de choisir comme paramètres d′entrée pour la modélisation statique du fer : les ions sulfates (SO 4 2-), le pH, la conductivité, le dioxyde de silicium (SiO 2 ) et le débit mensuel du fleuve Sassandra. A ces paramètres, il a été ajouté le paramètre temps (mois) pour la modélisation dynamique du fer. Les différentes simulations réalisées par le PMC, ont permis de montrer que les modèles 5-1-1 et 6-12-1 prédisent à plus de 99% respectivement les évolutions statique et dynamique du fer à Gaoulou. Ainsi, l′utilisation de ce modèle hybride est-t-il jugée très satisfaisante. Ce modèle peut servir de socle pour d′éventuelles études visant la gestion rationnelle, la protection et le développement durable du fleuve Sassandra et de l′océan Atlantique au niveau de l′exutoire de ce fleuve. © 2016 International Formulae Group. All rights reserved.Mots clés : ACP, modèle « ACP-PMC », océan Atlantique, pollution métallique, PMC.Prediction of the spatial and temporal evolution of the iron at tropical river outfall: case of Sassandra River at Gaoulou (Côte d'Ivoire) ABSTRACTThe modeling of the spatial and temporal evolution of the iron at the Sassandra River outfall (hydrometric station of Gaoulou) is the subject of this study. To do this, it was used the hybrid model "PCA-MLP." Two scenarios were studied: static modeling of iron and dynamic modeling of iron. The first part of this study has been devoted to research of the input parameters of multilayer perceptron (MLP) by principal component analysis (PCA). The results obtained allowed to select as input parameters for the static modeling of the iron: sulphate ions (SO 4 2-), pH, conductivity, silicon dioxide (SiO 2 ) and the monthly rate of the Sassandra River. In these settings, it was added the time parameter (month) for the dynamic modeling of the M. K. YAO et al. / Int. J. Biol. Chem. Sci. 10(6): 2768-2780 iron. The various simulations performed by the PMC showed that the models 5-1-1 and 6-12-1 predict more than 99% static and dynamic evolutions of the iron at Gaoulou respectively. Thus, the use of this hybrid model is satisfactory. It can be used for any studies to rational management, protection and sustainable development of the Sassandra River and the Atlantic Ocean near to Sassandra outfall.

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“…The values of the Ca/Na, Mg/Na and HCO3/Na ratios of the silicate, carbonate, and evaporitic end-members are taken fromGaillardet et al (1999). The data of the various world and African rivers plotted in this diagram are taken fromGaillardet et al (1997) ,Meybeck (2003), Picouet et al (2002,Orange (1996) andAgbri et al (2010).…”

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Geochemistry of the Lake Chad Tributaries Under Strongly Varying Hydro-climatic Conditions

et al. 2019

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The Lake Chad Basin (LCB) is one of the main endorheic basins in the world and has undergone large level and surface variations during the last decades, particularly during the Sahelian dry period in the 1970s and the 1980s. The Chari-Logone River system covers 25% of the LCB but accounts for up to 82% of the Lake Chad water supply. The aim of this study is to investigate the dissolved phase transported by the Chari-Logone system, in order (i) to elucidate the origin and the behavior of major elements and the weathering processes in the watershed; (ii) to estimate the total dissolved flux, its variability over the last decades and the driving factors. To do so, samples were collected monthly between January 2013 and November 2016 at three representative sites of the basin: in the Chari River in "Chagoua", in the Logone River in "Ngueli" just before the confluence of both rivers, and at a downstream site in "Douguia", 30 km after the confluence. Concentrations in major elements displayed significant seasonal variations in the Chari and Logone waters. At the seasonal time scale, the comparison between the concentrations of chemical elements and the flow rates showed a hysteresis loop. This hysteresis behavior correspond to a variable contribution over time of two water bodies, fast surface water, and slow groundwater, the latter carrying higher concentrations and Ca/Na ratio, which may result from the contribution of pedogenic carbonate weathering to the dominant signature of silicate weathering. On the other hand, similar average concentrations are observed in the Chari and Logone rivers, despite contrasted annual runoff. In addition, an interannual stability of ionic concentrations was observed in the Chari-Logone river during the flood regime, both during the years covered by our monitoring (2013-2016) and during the predrought period (1969, 1972 et 1973). This situation corresponds to a chemostatic behavior, where the annual river discharge is the main factor controlling the interannual variation of chemical fluxes.

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Bilan des flux de matières particulaires et dissoutes du Sassandra à Gaoulou pont (Côte d’Ivoire)

Cited by 3 publications

References 5 publications

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Prédiction de l’évolution spatio-temporelle du fer à l’exutoire d’un fleuve tropical : cas du fleuve Sassandra à Gaoulou (Côte d’Ivoire)

Geochemistry of the Lake Chad Tributaries Under Strongly Varying Hydro-climatic Conditions

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