Estimation of regional-scale groundwater flow properties in the Bengal Basin of India and Bangladesh

摘要: Quantitative evaluation of management strategies for long-term supply safe groundwater drinking from the Bengal Basin aquifer (India and Bangladesh) requires estimation large-scale hydrogeologic properties that control flow. The consists a stratified, heterogeneous sequence sediments with aquitards may separate aquifers locally, but evidence does not support existence regional confining units. Considered at large scale, be aptly described as single higher horizontal than vertical hydraulic conductivity. Though data are sparse, regional-scale is possible three existing types: heads, 14C concentrations, driller logs. Estimation carried out inverse modeling using measured by model calibration estimated water ages based on 14C, statistical analysis Similar estimates conductivities result all types; resulting typical value anisotropy (ratio to conductivity) 104. estimate supported simulation flow through geostatistical fields consistent log data. high in conductivity indicates even disconnected aquitards, if numerous, can strongly equivalent parameters an system.