Standardizing characterization of electromagnetic water content sensors: Part 2
- J. M. Blonquist, S. B. Jones, D. A. Robinson.
- Evaluation of seven sensing systems. Vadose Zone…
Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors(s) and do not necessarily reflect the views of the National Science Foundation. The main purpose of this report is to provide a vision for the use of geophysical instrumentation in watershed scale hydrological research. The aim of the report is to identify instrumentation that could significantly advance this vision for geophysics in hydrology during the next 3-5 years. The criteria for the development of this report were to develop a strategic vision for instrumentation support in hydrology. The vision has to provide researchable elements rather than routine characterization, focused narrowly enough on a single vision as to be practicable in a 3-5 year time frame; we acknowledge that this is one of a number of possible ways forward. Thus the vision in this report focuses on the measurement of geological structure and identification of flow paths using electromagnetic methods. The report identifies instruments, describes what they are and provides examples of their use. It also considers the deployment and costs associated with data collection, as well as examining the interpretation of data, and how the synergy between measurement and modeling could be achieved. Of specific interest are the airborne systems. Although airborne geophysics has been around for a while, it is only in the last few years that systems designed exclusively for hydrological applications have begun to appear, offering a cutting edge, scientific way forward. These systems such as skyTEM could revolutionize the hydrogeological interpretations for watershed research. The HMF Geophysics advisory group was established in the summer of 2005; it is a national committee composed of senior scientists with expertise spanning geophysics, hydrology and soil science. The team includes two geophysicists from the UK who have recently come to the end of a national five year lowland catchment hydrological study (LOWCAR), where geophysics played a significant role. As well as university researchers the group also includes geophysical contractors with expertise in airborne geophysical survey for hydrological applications, and scientists from the US Geological Survey. 5 The concept to emerge from this work was the development of 3-D, cross scale set of electromagnetic measurements to construct a seamless, 3-D electrical model, of the subsurface in watersheds, and to have this integrate with existing geophysical characterization and ongoing work. It assumes a 'top down' approach using airborne methods to identify the dominant architecture of the …