The Kandi basin is located in northeast Benin (West Africa). This study is focused on the estimation of water fluxes exchanged between the river Niger (and its tributaries) and the transboundary Iullemeden Aquifer System. In that framework, an innovative approach based on the application of the Bayesian Mixing Model (MixSIAR) analysis on water isotopes (oxygen-18, deuterium and tritium) was performed. Moreover, to assess the relevance of the model outputs, Pearson’s correlation and Principal Component Analysis (PCA) have been done. A complex relationship between surface water and groundwater has been found. Sixty percent (60%) of groundwater samples are made of more than 70% river water and rainwater; while 31.25% of surface water samples are made of about 84% groundwater. To safeguard sustainable water resources for the well-being of the local communities, surface water and groundwater must be managed as a unique component in the Kandi basin.
References
[1]
Bouchez, C. (2015) Balance and dynamics of lake(s)/aquifers interactions in the hydrological basin of Lake Chad. Ph.D. Thesis, Aix Marseille Université. https://hal.science/tel-01298153
[2]
Loh, Y.S.A., Fynn, O.F., Manu, E., Afrifa, G.Y., Addai, M.O., Akurugu, B.A., et al. (2022) Groundwater—Surface Water Interactions: Application of Hydrochemical and Stable Isotope Tracers to the Lake Bosumtwi Area in Ghana. Environmental Earth Sciences, 81, Article No. 518. https://doi.org/10.1007/s12665-022-10644-x
[3]
Dieng Ndao, N.M. (2017) Etude de la relation eaux de surface-eaux souterraines dans un contexte de changements climatiques dans la zone Sud du bassin du Saloum (Sénégal). Ph.D. Thesis, Université de Liège.
[4]
Kpegli, K.A.R., van der Zee, S.E.A.T.M., Alassane, A., Bier, G., Boukari, M., Leijnse, A., et al. (2018) Impact of Hydraulic and Storage Properties on River Leakage Estimates: A Numerical Groundwater Flow Model Case Study from Southern Benin. Journal of Hydrology: Regional Studies, 19, 136-163. https://doi.org/10.1016/j.ejrh.2018.07.004
[5]
Luijendijk, E., Gleeson, T. and Moosdorf, N. (2020) Fresh Groundwater Discharge Insignificant for the World’s Oceans but Important for Coastal Ecosystems. Nature Communications, 11, Article No. 1260. https://doi.org/10.1038/s41467-020-15064-8
[6]
Sechu, G.L., Nilsson, B., Iversen, B.V., Møller, A.B., Greve, M.B., Troldborg, L., et al. (2022) Mapping Groundwater-Surface Water Interactions on a National Scale for the Stream Network in Denmark. Journal of Hydrology: Regional Studies, 40, Article ID: 101015. https://doi.org/10.1016/j.ejrh.2022.101015
[7]
Alidou, S. (1983) Etude géologique du bassin paléo-mésozoïque de Kandi (nord-est du Bénin, Afrique de l’ouest). Ph.D. Thesis, Université de Bourgogne.
[8]
Konate, M.E. (1996) Evolution Tectono-Sedimentaire du Bassin Paleozoique de Kandi (Nord Benin, Sud Niger). Ph.D. Thesis, Universite de Nancy I et de Bourgogne.
[9]
Gbewezoun, H.G.V. (2017) Caractérisation structurale et hydrodynamique de l’aquifère superficiel du bassin sédimentaire de Kandi (Nord-Est du Bénin). Master’s Thesis, Université d’Abomey-Calavi, Benin.
[10]
Heckmann, M., Bosch, K., Konaté, M., Issifou Fatiou, A.K. and Aboud Ali, I. (2019) Geological Map of the Transboundary Region Benin, Niger, and Nigeria. Sedimentary Basins: Iullemmeden, Kandi, Sokoto. AGES Technical Report N° 5, BGR & NBA. Hannover & Niamey.
[11]
Achidi, J., Bourguet, L., Elsaesser, R., Legier, A., Paulvé, E. and Tribouillard, N. (2012) Notice Explicative de La Carte Hydrogéologique Du Bénin: Carte Du Bassin Sédimentaire de Kandi à l’échelle 1/200000. DGEau: Cotonou, Bénin.
[12]
R Core Team (2022) R: A Language and Environment for Statistical Computing. R Foundation for Statistical Computing. https://www.R-project.org/
[13]
RStudio Team (2022) RStudio: Integrated Development Environment for R. http://www.rstudio.com/
[14]
Plummer, M. (2017) JAGS Version 4.3.0 User Manual. https://people.stat.sc.edu/hansont/stat740/jags_user_manual.pdf
[15]
Stock, B.C., Jackson, A.L., Ward, E.J., Parnell, A.C., Phillips, D.L. and Semmens, B.X. (2018) Analyzing Mixing Systems Using a New Generation of Bayesian Tracer Mixing Models. PeerJ, 6, e5096. https://doi.org/10.7717/peerj.5096
[16]
Dansgaard, W. (2012) Stable Isotopes in Precipitation. Tellus A: Dynamic Meteorology and Oceanography, 16, 436-468. https://doi.org/10.3402/tellusa.v16i4.8993
[17]
Lê, S., Josse, J. and Husson, F. (2008) FactoMineR: An R Package for Multivariate Analysis. Journal of Statistical Software, 25, 1-18. https://doi.org/10.18637/jss.v025.i01
[18]
Olivoto, T. and Lúcio, A.D. (2020) Metan: An R Package for Multi-Environment Trial Analysis. Methods in Ecology and Evolution, 11, 783-789. https://doi.org/10.1111/2041-210x.13384
[19]
Kpegli, K.A.R., Alassane, A., Trabelsi, R., Zouari, K., Boukari, M., Mama, D., et al. (2015) Geochemical Processes in Kandi Basin, Benin, West Africa: A Combined Hydrochemistry and Stable Isotopes Approach. Quaternary International, 369, 99-109. https://doi.org/10.1016/j.quaint.2014.12.070
[20]
Alassane Zakari, A. (2017) Caractérisation Hydrogéochimique et Étude Du Transfert Des Contaminants Dans Les Eaux Souterraines Du Bassin de Kandi (Nord-Bénin). Master’s Thesis, Université d’Abomey-Calavi.
[21]
IAEA (2017) Integrated and Sustainable Management of Shared Aquifer Systems and Basins of the Sahel Region RAF/7/011 Iullemeden Aquifer System.
[22]
Bosch, K., Abou, A., Heckmann, M. and Zinsou, D.S. (2019) Rapport de suivi des eaux souterraines dans le bassin du Fleuve Niger. Annee 2018 AGES Technical Report N° 7, BGR & NBA. Hannover & Niamey.
[23]
Orou Pete Alou, S.G., Gbewezoun , H.G.V., Alassane Zakari, A., Alassane, A., Lawin, A.E., Mama, D., et al. (2021) Caracterisation De L’aquifere Superficiel Du Bassin Sedimentaire De Kandi (Nord-Est Benin, Afrique Ouest): Nature Et Structure Du Reservoir, Hydrodynamique. European Scientific Journal ESJ, 17, 79-103. https://doi.org/10.19044/esj.2021.v17n3p79
