Groundwater management for transient flow through confined aquifers
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Date
2018-05
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Highly variable surface water in arid and semi-arid regions has placed groundwater in a major role in most water supply systems. However, due to lack of proper management, many groundwater aquifers are depleted and contaminated. Benefiting from the advancement of geophysical knowledge on subsurface flow phenomena and computer capability, effective management of groundwater aquifer of various complexities has become practical and viable. In this study, a nonlinear optimization model has been developed for groundwater management through confined aquifers with the objective of maximizing the discharge satisfying the constraints related to the maximum allowable drawdown and pump characteristics. The unit response function has been used to calculate drawdown values at the control points by using pumping wells. The unit response function has been generated with the help of Cooper-Jacob formula. The model explicitly considers the random nature of transmissivity and storage coefficient, which enables the determination of optimal pumping pattern in a well field. Applicability of the developed optimization model has been illustrated by solving a hypothetical example for different values of maximum desirable drawdown. The developed optimization model has been also solved for a different pump to see the effect of pump characteristics on the solution. The results indicate that the total discharge and efficiency are affected with the change in pump characteristics. The results show that the optimal discharges are more for larger values of maximum allowable drawdown. The optimal solution is also affected by imposing restrictions on minimum desired discharge.
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