A new approach for the transposition of a geological structure in a deterministic multilayer model

In a multilayer approach for a numerical modeling of an aquifer, a correct evaluation of stratigraphic columns allow first to define the geological units surfaces and then to build a proper geological model that must also represent the reference for the three-dimensional deterministic model. When the geological units are directly converted into the layers of the deterministic model, the evaluation of the hydrogeological parameters may result incoherent. The presence of a high hydraulic conductive lens disposed within an aquitard unit, in fact, may considerably alter the related characteristics. A different approach can be followed by deepening the stratigraphic columns discretization through the hydrodynamic characterization of the granulometries when these are substantially different. This procedure determines the number of representative layers for each column. A further procedure is then necessary to render homogeneous the sample in terms of layers number. The number resulting from the last homogenization process, coincides with the number of the deterministic model layers. In this paper the previous procedure is presented, together with the module development in Access in order to obtain a digital layout for FEFLOW. The reliability of the results is finally investigated with respect to data availability.