Influence of the Djondji-Houncloun pilot dredging on the dynamics of 
physico-chemical parameters of Lake Ahémé and its channels in Benin

Amoussou, Ernest; Ahouansou Montcho, Simon; Totin Vodounon, Sourou Henri; Amoussou, Toundé Félix; Allagbé, Yemalin Simon; Ahéhéhinnou Yèdo, M. Fidèle; Adéchina, A. Rodrigue M. A.; Kodja, Domiho Japhet; Bossa, Y. Aymar; Assimalekpo, Coffi Florentin; Adissoda, K. Olive; Boko, Michel

doi:10.57757/IUGG23-3662

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Influence of the Djondji-Houncloun pilot dredging on the dynamics of physico-chemical parameters of Lake Ahémé and its channels in Benin

Authors

Amoussou, Ernest
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ahouansou Montcho, Simon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Totin Vodounon, Sourou Henri
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Amoussou, Toundé Félix
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Allagbé, Yemalin Simon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ahéhéhinnou Yèdo, M. Fidèle
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Adéchina, A. Rodrigue M. A.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kodja, Domiho Japhet
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bossa, Y. Aymar
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Assimalekpo, Coffi Florentin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Adissoda, K. Olive
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Boko, Michel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Amoussou, E., Ahouansou Montcho, S., Totin Vodounon, S. H., Amoussou, T. F., Allagbé, Y. S., Ahéhéhinnou Yèdo, M. F., Adéchina, A. R. M. A., Kodja, D. J., Bossa, Y. A., Assimalekpo, C. F., Adissoda, K. O., Boko, M. (2023): Influence of the Djondji-Houncloun pilot dredging on the dynamics of physico-chemical parameters of Lake Ahémé and its channels in Benin, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3662

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020880

Abstract

The physico-chemical quality of these water masses in this system determines the biological production and consequently the development of the socio-economic activities of this environment. The objective of this study is to analyze the physico-chemical parameters and to assess the occurrence and abundance of fish species caught during dredging in order to deduce its effects on the hydrosystem. The physico-chemical parameters considered are pH, salinity (mg/l), turbidity (NTU), suspended solids MES (mg/L), transparency (cm) and dissolved oxygen (mg/ L), with an inventory of the species caught in the dredging area.At the end of the results, it mainly emerges that: (i) the pH and the salinity vary very little under the effect of the dredging while the TDS, the turbidity and the suspended solids are strongly influenced by the dredging and especially the discharge sediments. Thus, there is a downward trend in transparency of 55.50% on average against a suspended matter of +90.50% and a turbidity of +68.50% increasing. This influences dissolved oxygen. However, these variations are temporary and its expansion is very limited due to the variation of the tides (high and low). The evolution of dredges in water gives a new order of spatial distribution of fish species according to their character of dependence and/or tolerance to turbid waters and sometimes low in dissolved oxygen. The repopulation of marine species in the dredged environment is an indicator of an ecosystem suitable for the life biology of formerly extinct species.