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Fig. 1.
(a) Study area map showing sampling locations, various Rivers and digital elevation model. The pink triangles represent groundwater sampling points (b) Generalised geological map showing groundwater flow direction and various geologic types (c) Hydrogeological cross
–
section A-A
′
of Komadugu
–
Yobe basin showing different lithologies, groundwater recharge and discharge zones and the groundwater table.
Fig. 2. .
Pearson
’
s correlation analysis results (a) wet season (b) dry season. Loading plot of three PCs (PC1, PC2 and PC3) in 3D (c) wet season (d) dry season.
Fig. 3.
Dendogram of groundwater quality parameters showing different clusters (a) Wet season (b) Dry season. Dendogram of sampling locations showing different clusters (c) Wet season (d) Dry season.
Fig. 4.
Spatial distribution of groundwater clusters related with geology and electrical conductivities (a) wet season (b) dry season.
Fig. 5.
Piper diagram for groundwater samples in Komadugu
–
Yobe basin(a) wet season (b) dry season.
Fig. 6.
Saturation indices of some selected minerals against electrical conductivity of groundwater samples of wet and dry seasons.
Fig. 7.
Gibbs plots of geochemical processes governing groundwater chemistry (a) cations (b) anions.
Fig. 8.
Bivariate plots of: (a) Na+/Cl−vs. EC; (b) Na+vs. Cl−(c) Ca
2
+/Mg
2
+vs. HCO3
−(d) Mg
2
+/Na+vs Ca
2
+/Na+(e) HCO
3 -
/Na+vs Ca
2
+/Na+(f)CAI
–
II vs. CAI
–
I.
Fig. 9.
Conceptual model for geochemical evolution and hydrogeochemical processes controlling the groundwater chemistry in Komadugu Yobe basin.
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