Mass transport modelling to assess contamination of a water supply well in Sabarmati river bed aquifer, Ahmedabad City, India |
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Authors: | V V S Gurunadha Rao S K Gupta |
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Institution: | (1) National Geophysical Research Institute, Hyderabad-500 007, India e-mail: postmast@csngri.ren.nic.in, IN;(2) Physical Research Laboratory, Ahmedabad-380 009, India, IN |
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Abstract: | Drinking water supply wells were constructed in the Sabarmati river bed aquifer of Ahmedabad city using radial pipes and
are known as French Collector wells. Contamination of groundwater from one of the French wells near Sabarmati railway bridge
was noticed in 1992. The suspected pollution sources are Duff-nala of Shahibaug and two other sources from slum dwellings
on either side of Sabarmati river. A combined groundwater flow, pathlines and a mass transport model was constructed covering
an area of 9 km2 to analyse the capture zone of the French well under two different scenarios. Aquifer parameters of the river bed aquifer
were available. Dry river bed condition was simulated under scenario I and controlled flow in the river bed was simulated
under scenario II. The groundwater velocity and migration of contaminant particles from sources was analysed in the pathline
model. Total dissolved solids (TDS) concentration contours originating from sources in the mass transport model (MT3D) were
computed by solving an advection-dispersion equation. The computed pathlines and TDS concentration contours indicate likely
migration of contaminant plume from pollutant sources to the French well during 365 days under two scenarios. The model results
confirm the tracer injection studies carried out to know the likely migration of contaminants towards the French well. The
modelling study emphasised the necessity of controlled release of surface water in Sabarmati river bed from Dharoi reservoir
throughout the year.
Received: 28 October 1998 · Accepted: 17 June 1999 |
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Keywords: | Flow model Mass transport Pathlines Groundwater velocity Sabarmati river French collector well Dry river bed Tracer |
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