Abstract
Excessive groundwater extraction may lead to groundwater depletion and causes land subsidence, sea water intrusion, and groundwater quality degradation. Regarding these problems, it is required to study the sand column placed at the base of the reservoir as an alternative solution to increase the amount of water recharged into the aquifer. In this study, numerical modelling was used to explore the potential of the sand column to increase the volume of water recharged into the aquifer. The numerical modelling was then compared with a corresponding analytical solution from the previous related study. There has never been any research conducting numerical model to determine the amount of groundwater recharge through sand column placed in the recharge reservoir. The results showed a good agreement between the analytical solution and the numerical modelling, indicated by the coefficient of determination (R2) of 0.997, even though the numerical modelling results always slightly underestimate the results of the analytical solution. A coefficient factor (Cf) which is obtained from multiple linear regression analysis is included in the analytical solution to approach the results of numerical model. Results of the research show that there is an increase in the groundwater recharge rate in each of water level increment in the reservoir (Hw), for all different number of sand column's (Nc) scenarios. However, there is a decrease of groundwater recharge into the aquifer in relation to the increase of semi impermeable thickness below the reservoir (z). The results also show that the increasing number of sand column increased the groundwater recharge at all different scenario of water level above reservoir (Hw).
Published Version
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