Simulación matemática del sistema acuífero de Chalco-Amecameca, México

Abstract

On the western side of the Chalco plain, the upper 100 m. of lacustrine sediments constitute a aquitard. Below that level, the detrital fill constitutes a semiconfined aquifer which gradually becomes unconfined toward the east and southeast. From the piezometric levels (1974-1988), the aquitard is essentially independent of the semiconfined aquifer. The aquitard has an elliptical dome shape and the level of the aquifer drops consistently in time, especially in the northern and western part of the valley. This is due to overexploitation at a rate of 1.20 m3 /s. The Kinzelbach model was used in order to predict the piezometric levels in terms of discharge and recharge. The simulation by finite differences assumed initial equilibrium conditions for the aquifer, taking the 1988 levels as reference. A simulation carried out for non-equilibrium conditions suggests that the lows do not migrate in time but tend to spread out.