Abstract
The south-western region of Bangladesh is part of the Ganges floodplain with numerous rivers and channels linked with the Bay of Bengal. The areas which are closer to the sea face heavy risk of being affected by the increase in salinity of groundwater. Assessment of groundwater vulnerability owing to salinity is crucial for effective groundwater management. To address this issue, GALDIT approach was taken in eight Upazilas (sub-districts) of three districts in South-Western Bangladesh, where 161 tube wells were considered for groundwater sampling. Parameters including salinity, as well as other parameters, were measured using a field test-kit. Besides, qualitative survey in relation to groundwater salinity was further verified with the kit. The field values obtained were modified according to relations derived from the laboratory test results. The GALDIT index was estimated by multiplying each of the six parameters weight by its rating, corresponding to its study area and summing the total value. Finally, a map was prepared, where about 17.0% of the study area was marked as high vulnerability risk, 62.4% is moderately vulnerability risk and 20.6% low vulnerability risk classes. The moderate vulnerability risk class is situated in the north, the east and central part of the area, which should be taken care of the contamination of groundwater.
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Acknowledgement
The authors would like to thank all the field staff of IWM at the Khulna Project office who provided the data required for carrying out the study.
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Hasan, M.R., Zannat, M.EU., Hossain, A.F.M.A., Shah-Newaz, S.M., Hossain, M.M. (2020). Groundwater Vulnerability Mapping to Salinity Intrusion Using GALDIT Method: A Case Study of the South-Western Coastal Region of Bangladesh. In: Haque, A., Chowdhury, A. (eds) Water, Flood Management and Water Security Under a Changing Climate. Springer, Cham. https://doi.org/10.1007/978-3-030-47786-8_9
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