This book is the first to cover the fundamentals of hydrogeophysics from both the hydrogeological and geophysical perspectives. Authored by leading experts and expert groups, the book starts out by explaining the fundamentals of hydrological characterization, with a focus on hydrological data acquisition, hydrological measurement analysis, and geostatistics. The fundamentals of geophysical characterization are then presented, with a focus on electrical resistivity, induced polarization, electromagnetic, GPR and seismic methods. The geophysical methods and petrophysical discussions presented here emphasize the theory, assumptions, approaches, and interpretations that are particularly important for hydrogeological applications. A series of case studies illustrate hydrogeophysical approaches for mapping hydrological units, estimation of hydrogeological parameters, and monitoring of hydrogeological processes in both the vadose and saturated zones. Finally, the book concludes with a discussion of hydrogeophysical frontiers, such as emerging technologies and stochastic hydrogeophysical inversion approaches. Hydrogeophysics is intended to provide an introduction to students and to new researchers to the field, to be used as a resource for researchers already active in the field, and to serve as a springboard for advances in the field that are needed to improve our understanding and management of the earths shallow subsurface.