Opportunities for insight into groundwater processes: Geophysical approaches to hydrogeological challenges
Geophysical approaches to hydrogeological challenges continue to offer opportunities for insight into groundwater processes. By understanding and exploiting coupled hydrogeophysical phenomena, methodologies can be developed to assess properties and processes both qualitatively and quantitatively. Two phenomena in particular, heat transport and small gravitational and pressure fluctuations, are used here to develop powerful new tools for the measurement of hydrogeological processes and properties. As the natural cycles of both of these phenomena affect the subsurface in a periodic way, analytical and frequency-domain techniques can be used to extract useful information for the assessment of groundwater resources.
Passive measurements of subsurface properties