An integrated geological, hydrogeological, geochemical and geophysical study of arsenic pollution in groundwater of Gotra area, West Bengal Part B: Hydrogeology

摘要

Characterisation of the groundwater flow system at the Gotra field site involved the installation of a network of monitoring wells, some of which were instrumented with data loggers for the continuous recording of water levels as well as electrical conductivity, pH and temperature. The potentiometric data, hydrometeorological data from nearby weather stations, as well as hydrostratigraphic data were used to develop a preliminary steady-state numerical (MODFLOW) groundwater-flow model of the site. Groundwater flow-paths determined from the model show that observed high arsenic concentrations can be traced back to organic-rich sediments filling an abandoned river channel.