Allan L. Gutjahr

TL;DR: In this paper, the authors analyzed unsaturated flow in heterogeneous soil with an arbitrarily oriented mean hydraulic gradient using spectral solutions of the stochastic perturbation equation which describes the capillary pressure head ψ.

TL;DR: In this article, the authors compared seven different inverse approaches for identifying aquifer transmissivity and found that the linearized methods were more accurate than those of nonlinear methods in predicting travel times and travel paths.

TL;DR: In this paper, a two-dimensional steady groundwater flow in a confined aquifer with spatially variable transmissivity T is analyzed stochastically using spectral analysis and the theory of intrinsic random functions.

TL;DR: In this paper, the authors developed stochastic solutions of the differential equation describing one-dimensional flow through a porous medium with spatially variable hydraulic conductivity which is represented by a stationary (statistically homogeneous) random process.

TL;DR: In this article, the authors developed an iterative method which combines classical cokriging and a numerical flow model to obtain optimum estimates of transmissivity and head distributions and to alleviate the limitations of classical kriging.