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Determining sources of groundwater salinity in the multi-layered aquifer system of the bengal delta, Bangladesh

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dc.contributor.author Zahid, Anwar
dc.contributor.author Rahman, Aminur
dc.contributor.author Hassan, M. Rashidul
dc.contributor.author Ali, M. Hazrat
dc.date.accessioned 2017-08-07T06:47:03Z
dc.date.available 2017-08-07T06:47:03Z
dc.date.issued 2016
dc.identifier.citation Zahid, A., Rahman, A., Hassan, M. R., & Ali, M. H. (2016). Determining sources of groundwater salinity in the multi-layered aquifer system of the bengal delta, Bangladesh. BRAC University Journal, XI(2), 37–51. en_US
dc.identifier.issn 18113079
dc.identifier.uri http://hdl.handle.net/10361/8386
dc.description This article was published in the BRAC University Journal [© 2016 Published by BRAC University]. en_US
dc.description.abstract The study area lies on the coastal belt of the Bengal Delta, southern Bangladesh. This study bas been condocted to deteonine salinity sources in the multi-layered aquifers of the Bengal Delta. Dissolved major ions including chloride (Cr) and brontide (Br) were measured in groundwater of the coastal areas of Bangladesh to assess the source(s) of salinity. Ionic concentrations of 48 groundwater samples were analyzed for this study; samples were collected from observation wells installed at different depths down to 336 m. The major ion trends of the upper (<200 m deep) Sodium (Na')-Chloride (Cr) groundwater type is defined as Na+> Calcium (Ca2l> Magnesium (Mg'"')> Potassium (K"') and Cl> Bi-carbonate (HC03 )> Sulfate (So,'-). The deep groundwater (201-336 m deep) bas ionic trend of Na+>Ca2+>Mg'+>K+ and HC03>Cl>So.'·. The shallow groundwater (<200 m deep) of the south central coast bas Br:Cr ratios between 0.00234 and 0.00354 and correspondiog Cr:Br molar ratios between 635.51 and 959.78, which indicates that seawater from the ocean is the principal source of chloride in the upper aquifers with the mixture of fresh water mainly recharged from monsoon rain. At some locations in the south-central coast, seawater is also the principal source of the salinity in deep groundwater, within the depth ranging from 201 to 336 m. Elevated chloride concentration might be due to the entrapment of relict seawater in the sediment during Holocene transgression. en_US
dc.format.extent 15 pages
dc.language.iso en en_US
dc.publisher © 2016 Published by BRAC University en_US
dc.subject Groundwater salinity en_US
dc.subject Coastal plain en_US
dc.subject Sources of salinity en_US
dc.subject Bromide en_US
dc.subject Chloride ratio en_US
dc.title Determining sources of groundwater salinity in the multi-layered aquifer system of the bengal delta, Bangladesh en_US
dc.type Article en_US
dc.description.version Published


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