Abstract
Recently, the demand for deep underground excavation and the development and utilization of its resources has increased. This raises a need to predict the behavoir of the groundwater in multilayered aquifers in order to promote its conservation. The exact determination of hydraulic properties of each aquifer is very important for the correct groundwater flow prediction. Pumping tests are usally per- formed under the multilayerd conditions. It is, however, difficult to analyze the data obtained from the pumping test under these conditions "analytically".
In this paper a new method of estimating aquifer coefficients from pumping test data in multi- layered aquifers is proposed. In this method a nonlinear least squares algorithm incorporating coupled stress-flow finite element analysis is used. The advantage of the proposed method is in the possibility of indentifying the optimal hydraulic properties both aquifers, and aquitards. Finally, for estimating of groundwater conservation, the behavior of this groundwater near the excavation site is predicted by a numerical method.
