Kemgang Dongmo T. auteur aut IRD Boucher Marie auteur aut IRD Mvondo V.Y.E . auteur aut IRD Favreau Guillaume auteur aut IRD Ngounou Ngatcha B. auteur aut IRD Yalo N. auteur aut IRD Goni I.B. auteur aut IRD Legchenko Anatoli auteur aut IRD text journalArticle eng text/pdf born digital access At the edge of a semi-arid sedimentary basin, the Piedmont plain of the Mandara mountains is potentially a key area for the recharge of the Lake Chad Quaternary aquifer. We conducted two geophysical surveys based on magnetic resonance sounding (MRS) and Time-Domain Electromagnetism (TDEM) techniques for a better understanding of the aquifer structure at.the piedmont scale in aim to identify preferential groundwater recharge pathways. MRS water content and electrical resistivity of the medium confirmed the very heterogeneous and clayey nature of the quaternary aquifer, limiting the recharge to the sandiest areas. Thanks to the geophysical methods, these areas have been highlighted near temporary rivers and upstream of the study area near Maroua city. Because of the thickening of the aquifer downstream, the most transmissive zones are in the mid-slope of the piedmont. The geographical distribution of aquifer properties defined by geophysics and the range of MRS water content (from <2% to 26%) may be used in the future to constrain groundwater modelling and specify the recharge of the quaternary aquifer at mountain front. specialized Groundwater resources Mountain front recharge Piedmont aquifer Semi-arid climate TDEM / MRS West and Central Africa CAMEROUN MANDARA MONTS MAROUA TCHAD LAC BASSIN 062 021 170 art. 103840 [10 p.] 2019 0926-9851 https://www.documentation.ird.fr/hor/fdi:010077476 10.1016/j.jappgeo.2019.103840 0926-9851 [F B010077476] https://www.documentation.ird.fr/hor/fdi:010077476 https://www.documentation.ird.fr/intranet/publi/2020/01/010077476.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2020-02-05 2025-02-24 fdi:010077476 fre