Ahmed, Kazi Matin Uddin;
(1994)
The hydrogeology of the Dupi Tila Sands Aquifer of the Barind Tract, NW Bangladesh.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Barind in NW Bangladeshi is the land where life is written in water. Ground water is the life line for sustaining dry season agriculture. The sustainability of development in the area depends on the sustainability of the ground water resources. The Dupi Tila sands underlying the Barind Clay are a leaky confined aquifer with excellent hydraulic characteristics and ground water of good quality suitable for drinking and for irrigation. Continued development of the aquifer relies on sufficient recharge. A principal objective of this thesis is to investigate the recharge mechanism. This objective has been addressed by application of a hydrochemical and isotopic study and development of a water balance. The original contributions are put in context by a review of all the data relating to the Hydrogeology of the Barind. Recharge is principally derived as leakage through the Barind Clay, driven by a topographically induced hydraulic gradient which is enhanced by the effect of pumping. Irrigation boreholes set up ground water flow cells, each determining a similar chemistry for the abstracted ground water. Nevertheless chemical trends are observed which are used to deduce the hydrochemical evolution of the Dupi Tila ground water. The chemical and isotopic data show the bils to contribute a minor component to recharge. Isotope data illustrate a changing rainfall pattern over the last 3000 years. Judgement of the extent of development of the aquifer is shown to be dependent on the hydraulic conductivity attributed to the Barind Clay. There are indications that the Dupi Tila aquifer is already fully exploited. Further ground water development should not be undertaken without simultaneously monitoring piezometric conditions in the clay.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | The hydrogeology of the Dupi Tila Sands Aquifer of the Barind Tract, NW Bangladesh |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Thesis digitised by ProQuest. |
| Keywords: | Earth sciences; Bangladesh; Groundwater |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10101398 |
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