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OPTIMIZATION OF PUMPING AND RECHARGE IN THE COASTAL AQUIFER TO MINIMISE SEAWATER INTRUSION

Congress: 2008
Author(s):
V.Venkatachalam Post Graduate (Second Year Student), Hydrology & Water Resources Engineering, Centre for Water Resources, College of Engineering, Anna University, Chennai 600 025. prabu533@gmail.com

Keyword(s): Seawater-intrusion, Simulation, Optimization, Optimal management
AbstractThe development and management of fresh groundwater resources in coastal aquifers are seriously constrained by the presence of seawater intrusion. Underutilisation of the available groundwater resource means that valuable fresh water discharges naturally to the sea and is wasted; Overdevelopment, on the other hand, mines the resource and will cause a gradual degradation of water quality due to the encroachment of seawater. In coastal regions like, Puducherry (Tamil Nadu, India), there is added danger of the ingress of seawater encroachment. The Groundwater system simulation models can only simulate the response of the system to a specified management strategy. But for an optimal management strategy, an Optimization model should be developed, in addition to simulation model. This paper presents the simulation of flow and transport model in the coastal aquifer through VISUAL MODFLOW and the optimization of pumping and recharge rates using two or three optimization techniques to minimize the seawater intrusion in the coastal aquifer. And the results are compared for optimal management strategy.
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