MULTILAYERED LEAKY AQUIFER SYSTEMS .2. BOUNDARY-ELEMENT SOLUTIONS

The boundary element algorithm for the multilayered leaky aquifer system of Neuman-Witherspoon and Herrera is presented. By applying the Laplace transform to the integrodifferential equations of Herrera, a set of coupled two-dimensional elliptic equations results. The boundary integral representation is derived from Green's theorem. Green's functions governed by an adjoint system of the original governing equations are found from the pumping well solutions given in part 1 by a coefficient exchange. The resultant numerical system requires a discretization only at the boundaries of the planar aquifers and is free from aquitard unknowns. Several numerical examples, including one-dimensional flow, pumping well problems, and two-dimensional problems are provided for the purpose of validation and demonstration.