Presentazioni e Articoli Tecnici

For hydrogeologists pumping tests are the most common method to obtain characteristic aquifer properties, like transmissivity and storativity. For the evaluation of pumping tests it is common practice to compare field measurements and 1D analytical solutions. Numerical methods offer the chance to check how far 1D solutions fail if assumptions for 1-dimensionality are not fulfilled. We are using models in 2D cylinder coordinates for non-ideal situations in order to find the error of the analytical solutions. The results of the comparison provide important information, under which conditions the common evaluation methods are appropriate and when they are not.

COMSOL Multiphysics^® simulations are set up and performed for partially penetrating wells, with and without skin zone for confined, semi-confined and unconfined aquifers. Included interfaces are: Darcy’s Law (dl) and Moving Mesh (ale); the latter for the changing groundwater table. We compare with analytical solutions of Theis and Hantush, utilizing the LiveLinkTM to MATLAB^®.