Characterization of an island aquifer from tidal response |
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| Authors: | Pallavi Banerjee Deepak Sarwade V S Singh |
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| Institution: | (1) National Geophysical Research Institute, Uppal Road, Hyderabad, 500 007, Andhra Pradesh, India |
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| Abstract: | Growing demand for potable water for various needs has lead to indiscriminate exploitation of groundwater resources, particularly,
in the terrain where surface water resources are negligible. One such area is an island where groundwater is the only source
of fresh water. Groundwater is the prime source of fresh water on most of the atolls in the world. Groundwater on these islands
is in the form of thin fragile floating lens and is often vulnerable to overexploitation, draught, tidal waves, tsunami and
cyclone resulting in seawater ingress. Sustainable development of this meager source of fresh groundwater for a longer time
becomes a more difficult task on small atolls with a large population depending on this vital resource. To develop a sustainable
management scheme and identify the vulnerable part of aquifer, characterization of the aquifer system on islands is imperative.
Groundwater on an atoll is extremely vulnerable to seawater mixing through natural as well as human activities. One such natural
process is the tides of the ocean. The response of sea tide to the water table on the island offers valuable data as well
as cost-effective means to characterize an aquifer system. Such characterization is vital for the management of groundwater
resources on an atoll. The obtained results have compared well with the parameters obtained through a conventional pumping
test. Therefore, the use of tidal response to the water table, which can easily be recorded, provides a rapid and cost-effective
means to characterization of the aquifer system on the island. |
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| Keywords: | Coral island Groundwater Tide Aquifer characteristic Water table fluctuations |
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