Abstract
Groundwater is a critical freshwater source for billions of people (Klee, 2013), but resources are increasingly stressed by climate change, pollution, and overexploitation (Frappart & Ramillien, 2018, https://doi.org/10.3390/rs10060829). Locating groundwater sources and monitoring their sustainable use is a difficult task. One method that shows great promise is surface nuclear magnetic resonance (NMR), as it is the only technique capable of non-invasive direct measurements of subsurface water content and pore-space properties. Unfortunately, surface NMR often suffers from low-amplitude signals that limit mapping speeds and may prohibit measurements in noisy environments. We demonstrate a steady-state scheme for surface NMR, enabled by recent breakthroughs in transmitter capabilities and numerical modeling that delivers orders of magnitude signal enhancements. The new technique is a highly efficient measurement that is both narrowband and utilizes the full measurement interval in contrast to traditional approaches. Our results demonstrate that high-fidelity groundwater measurements are now possible in hitherto inaccessible areas.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | e2021GL095381 |
| Tidsskrift | Geophysical Research Letters |
| Vol/bind | 48 |
| Nummer | 23 |
| Antal sider | 9 |
| ISSN | 0094-8276 |
| DOI | |
| Status | Udgivet - dec. 2021 |