Among the current problems that hydrogeologists face, perhaps there is none as
challenging as the characterization of fractured rock (Faybishenko and Benson 2000). This …

Heterogeneity is the single most salient feature of hydrogeology. An enormous amount of
work has been devoted during the last 30 years to addressing this issue. Our objective is to …

The past decade has seen significant progress in characterizing uncertainty in
environmental systems models, through statistical treatment of incomplete knowledge …

The state of the groundwater inverse problem is synthesized. Emphasis is placed on aquifer
characterization, where modelers have to deal with conceptual model uncertainty (notably …

Hydraulic tomography is a cost‐effective technique for characterizing the heterogeneity of
hydraulic parameters in the subsurface. During hydraulic tomography surveys a large …

Two large‐scale cross‐hole pumping tests were conducted at depths of 191–226 m and 662–
706 m in deep boreholes at the Mizunami Underground Research Laboratory (MIU) …

Ensemble Kalman filters (EnKFs) are a successful tool for estimating state variables in
atmospheric and oceanic sciences. Recent research has prepared the EnKF for parameter …

Fracture networks play a more significant role in conducting fluid flow and solute transport in
fractured rock masses, comparing with that of the rock matrix. Accurate estimation of the …

Geology is ubiquitously heterogeneous, exhibiting both discrete and continuous spatial
variations on a multiplicity of scales. It is therefore natural to expect that hydrogeologic and …

This text combines the science and engineering of hydrogeology in an accessible,
innovative style. As well as providing physical descriptions and characterisations of …