Recharge of the Quaternary water table in the northwestern Lake Chad basin(southeastern Niger) estimated from isotopes.

Authors
Leduc, C Sabljak, S Taupin, JD Marlin, C Favreau, G
Citation
C. Leduc et al., Recharge of the Quaternary water table in the northwestern Lake Chad basin(southeastern Niger) estimated from isotopes., CR AC S IIA, 330(5), 2000, pp. 355-361
Citations number
10
Categorie Soggetti
Earth Sciences
Journal title
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DELA TERRE ET DES PLANETES
ISSN journal
12518050 → ACNP
Volume
330
Issue
5
Year of publication
2000
Pages
355 - 361
Database
ISI
SICI code
1251-8050(20000315)330:5<355:ROTQWT>2.0.ZU;2-L
Abstract
The Quaternary water table is present over almost the whole Lake Chad basin . In its Niger part, where annual rainfall varies from 0 to 350 mm, radioac tive isotopes (H-3 and C-14) ape interpreted in terms of renewal rate; medi ans are 0.10 and 0.05%, respectively, which means a recharge of about 2 or 3 mm.yr(-1). This very weak infiltration is compatible with the stable isot ope contents (H-2 and O-18) in groundwater, which show a mixing of old and recent waters, infiltrated during the last humid period and the present dri er times. (C) 2000 Academie des sciences / Editions scientifiques et medica les Elsevier SAS.