Fig. 2: Spatial distribution and isotope ratios of groundwater samples.
From: Shift in groundwater recharge of the Bengal Basin from rainfall to surface water
δ18O (a) and d-excess (b) of georeferenced groundwater samples (circles) across the Bengal basin (Bangladesh and West Bengal, India). The three major rivers, Ganges, Brahmaputra, and Meghna, and their tributaries are shown in red lines. Samples that were not georeferenced but included in the mixing model analysis have not been shown here. Groundwater δ18O and d-excess values across the basin were not spatially correlated (Moran’s I statistics were 0.18 and 0.11, p < 0.005 for δ18O and d-excess, respectively). The approximate locations of the precipitation station are shown as purple stars (panel a).
