L. Agbri, S. Bamba, I. Doumouya, and I. Savane, Bilan des flux de matières particulaires et 455 dissoutes du Sassandra à Gaoulou pont (Côte d'Ivoire), Sci Nat, vol.7, pp.107-118, 2010.

A. Suchet, P. Probst, J. Ludwig, and W. , Worldwide distribution of continental rock 458 lithology: Implications for the atmospheric/soil CO2 uptake by continental weathering 459 and alkalinity river transport to the oceans, Glob Biogeochem Cycles, vol.17, 2003.

C. Béné, A. Neiland, T. Jolley, S. Ovie, O. Sule et al., , p.462, 2003.

, Inland fisheries, poverty, and rural livelihoods in the Lake Chad Basin, J. Asian Afr

, Stud, vol.38, issue.1, pp.17-51

C. Bouchez, J. Goncalves, and P. Deschamps, Hydrological, chemical, and isotopic 465 budgets of Lake Chad: a quantitative assessment of evaporation, transpiration and 466 infiltration fluxes, Hydrol Earth Syst Sci, vol.20, pp.1599-1619, 2016.

J. Bouchez, J. Moquet, and J. C. Espinoza, River mixing in the Amazon as a driver of 469 concentration-discharge relationships, Water Resour Res, vol.53, pp.8660-8685, 2017.

C. Bouchez, P. Deschamps, and J. Goncalves, Water transit time and active recharge in 472 the Sahel inferred by bomb-produced 36, Cl. Scientific Reports, vol.9, 2019.

J. Bravard and F. Petit, , 2000.

J. Cabot, Le bassin du moyen Logone. Document de ORSTOM, P.355, 1965.

D. Calmels, A. Galy, and N. Hovius, Contribution of deep groundwater to the weathering 479 budget in a rapidly eroding mountain belt, Taiwan. Earth Planet Sci Lett, vol.303, pp.48-58, 2011.

J. Carmouze, La régulation hydrogéochimique du lac Tchad: Contribution à l'analyse 482 biogéodynamique d'un système lacustre endoréique en milieu continental cristallin, vol.483, p.413, 1976.

J. Chorover, L. A. Derry, and W. H. Mcdowell, Concentration-Discharge Relations in the 486 Critical Zone: Implications for Resolving Critical Zone Structure, Function, and 487 Evolution, Water Resour Res, vol.53, pp.8654-8659, 2017.

F. Dietrich, N. Diaz, and P. Deschamps, Origin of calcium in pedogenic carbonate nodules 489 from silicate watersheds in the Far North Region of Cameroon: Respective contribution 490 of in situ weathering source and dust input, Chem Geol, vol.460, pp.54-69, 2017.

J. I. Drever and J. Zobrist, Chemical weathering of silicate rocks as a function of elevation in 493 the southern Swiss Alps, Geochim Cosmochim Acta, vol.56, issue.92, p.90298, 1992.

C. Evans and T. D. Davies, Causes of concentration/discharge hysteresis and its potential as a 496 tool for analysis of episode hydrochemistry, Water Resour Res, vol.34, pp.129-137, 1998.

J. Gac, Géochimie du bassin du lac Tchad: Bilan de l'altération de l'érosion et de la 499 sédimentation, doc, vol.500, p.252, 1980.