Closed Analytic Elements with Flexible Geometry.

A simple and fast treatment of hydrogeologic features with irregularly shaped boundaries in two-dimensional analytic element groundwater flow models is presented. The star domain shapes of the features are restricted to closed shapes represented as smooth and continuous single-valued functions of distance from a focus point, . The element can be used to treat a variety of boundary and continuity conditions, including those of irregularly shaped lakes or heterogeneities in hydraulic conductivity.