Hydrogeophysics is a rapidly evolving discipline of geophysical methods dedicated to revealing properties and monitoring processes in the vadose zone as well as in aquifers. The discipline is relevant for environmental, hydrological, and agricultural research and engineering. Key processes in the application areas are contaminant transport, sustainability of ecosystems and biodiversity, plant growth, and soil-atmosphere interactions. Groundwater is the key component in the subsurface pore volume. Electric and electromagnetic methods are highly sensitive to water content and are therefore most suitable for addressing the problems related to subsurface physical properties and processes. These include subsurface spatial and temporal variability, its...

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