TY - JOUR
AU - Ibrahim, Yusuf
AB - The intention of the study was to establish the flow regime and quality of the groundwater, and to define the mechanisms of recharge, that prevail in the Hadejia-Jamaare-Komadugu-Yobe Basin, in semiarid northeastern Nigeria. This basin is quite significant, as at its centre is the Hadejia-Nguru Wetlands (HNW)—a wildlife conservation area—in addition to it being the most extensive floodplain in the region. Consequently, water level measurements, along with geochemical and stable isotope (δ18O and δ2H) sampling at 150 groundwater points, were carried out across the basin. Results show that groundwater flows from the southwest to the northeast following the river system. Furthermore, the Yobe River acts as effluent in a short reach between the towns of Gashua and Geidam. Groundwater quality in the study area is generally good, although isolated areas of anthropogenic contamination from leakage of domestic waste and agriculture, as well as dissolution of evaporate minerals, have been identified. The stable isotopes have a wide range of values, from –7.4 to +3.4‰ δ18O and –49 to +14‰ δ2H. Groundwater isotopic signatures regress along the relation δ2H = (5.5·δ18O – 4.9) and indicate evaporation effects during recharge processes. The results clearly identify areas proximate to surface waters of the HNW and the rivers as having focused recharge, with enriched δ18O and δ2H values. The areas remote from surface water are characterised by diffuse recharge with depleted isotope values, where recharge is directly from precipitation infiltrating through the unsaturated zone.
TI - Geochemical and isotopic studies in parts of the Hadejia-Jamaare-Komadugu-Yobe Basin, NE Nigeria
JF - Hydrogeology Journal
DO - 10.1007/s10040-023-02637-2
DA - 2024-02-01
UR - https://www.deepdyve.com/lp/springer-journals/geochemical-and-isotopic-studies-in-parts-of-the-hadejia-jamaare-ayxaeL9mWO
SP - 113
EP - 129
VL - 32
IS - 1
DP - DeepDyve
ER -