Evaluation of Groundwater Resources on the Coral Islands of Lakshadweep, India by Vijay Shankar Singh

Author:Vijay Shankar Singh
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

6.4 Numerical Model

The simple approach based on water balance, as described above will make it possible to have an assessment of fresh water lens or the amount of potable water on the coral island. The assumption of GH interface can lead to simple model of the island aquifer. It provides the depth of interface or the mid-point of transition zone. Such model can be used to estimate the outflow to sea considering horizontal flow in the aquifer. However, the effect of tides and its variation, formation of transition zone and mixing of sea water into lower freshwater lens requires better models to simulate the groundwater regime on island.

The groundwater flow in the coral island aquifers is often complex. The structural disposition of coral aquifers affects the flow into the freshwater lens as well as in the transition zone. It is further influenced by the varying stresses such as recharge rate, abstraction, tides and depth of interface or thickness of transition zone.

In order to generate more specific knowledge about the behaviour of freshwater lens or flow in the aquifer on the island, numerical method may be adopted considering the time-variant stresses on the aquifer and horizontal as well as vertical flow in the aquifer. One such method is simulating the two-layer aquifer system with flow of variable density water and the mixing of freshwater and sea water with the help of computer code SUTRA (Voss 1984). Several workers such as Oberdorfer et al. (1990), Underwood et al. (1992), Griggs and Peterson (1993), Voss and Souza (1987), Bobba (1998), Singh and Gupta (1999), Bailey et al. (2010) have simulated the island aquifer using SUTRA.

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