Physics – Geophysics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3917l&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 23, p. 3917-3920
Physics
Geophysics
6
Exploration Geophysics: Radioactivity Methods, Hydrology: Soil Moisture, Hydrology: Instruments And Techniques
Scientific paper
The temporal evolution of activity profiles of the radon isotope 222Rn in the top 50 cm of soil is used to quantify diffusive gas transport in the air-filled pore space. Air is continuously collected from gas-permeable, hydrophobic membrane tubes placed at various depths under the surface and circulated through a high-sensitivity Rn detector. With a micro-processor controlled inlet system an automatic monitoring of several level is possible for extended periods of time with a typical time resolution of one hour. In addition, a new dynamic approach to measure the in-situ soil diffusivity Ds (m2/s) around the subsurface tubes is presented where the recovery from air injection is evaluated every 3 hours. Within a test period of 3 weeks Ds dropped from 10-6m2/s to 3.10-7m2/s at a depth of z=50cm due to increasing water content of the soil.
Lehmann Bernhard E.
Lehmann Martin
Neftel Albrecht
Tarakanov Sergei V.
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