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Groundwater flow systems in the Bengal Delta, Bangladesh, inferred from subsurface temperature readings

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Author(s): Ratan Kumar Majumder | Jun Shimada | Makoto Taniguchi

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 35;
Issue: 1;
Start page: 99;
Date: 2013;
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Keywords: temperature | thermal gradient | recharge | discharge | groundwater flow

ABSTRACT
Borehole temperatures were measured in observation wells to determine the temperature-depth profile, magnitude oftemperature and thermal gradient. The observed temperature profiles are classified into recharge and discharge types. Therecharge-type wells are located in the northern site of the study area. Meanwhile, discharge-type wells are found in thesouthern site of the study area. The 2-D cross-section of subsurface temperature shows that the shallow groundwater temperature in the southern discharge area is higher than that of the northern recharge area. The calculated temperature-depthprofiles for shallow wells show the recharge rate ranging from 0.04 to 1.35 m/year and discharge rate within the range of -0.2to -0.79 m/year. On the contrary, the recharge rate is 0.05 to 0.16 m/year and discharge rate -0.15 m/year for the deep well sites.The present study has revealed the existence of shallow and deep groundwater flow systems in Bengal Delta aquifers.

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