Water content and porosity estimated from ground-penetrating radar and resistivity |
| |
| Institution: | 1. Department of Mathematics and Geosciences (DMG), University of Trieste, Trieste, Italy;2. National Research Council (CNR), Institute of Marine Sciences (ISMAR), Trieste, Italy;1. Agrosphere, IBG-3, Forschungszentrum Jülich, Jülich, 52425, Germany;2. School of GeoSciences, The University of Edinburgh, Edinburgh EH1 2QL, United Kingdom;1. Aden University, Department of Engineering Geology, PO Box 405, Ataq, Shabwah, Yemen;2. University of Twente, Faculty of Geo-Information Science and Earth Observation (ITC), Department of Earth Systems Analysis, PO Box 217, 7500 AE Enschede, The Netherlands;3. Utrecht University, Department of Physical Geography, PO Box 80115, 3508 TC Utrecht, The Netherlands;1. School of Geography and Tourism, Qufu Normal University, Rizhao, China;2. Postdoctoral Research Station of Agricultural Resources and Environment, Shandong Agricultural University, Tai''an, China;3. Institute of Land Reclamation and Ecological Reconstruction, China University of Mining and Technology, Beijing, China |
| |
| Abstract: | Both ground-penetrating radar and the resistivity method have proven to be useful tools for exploring water content variations, since related parameters such as dielectric constant and the resistivity of rocks and sediments are highly dependent on moisture content. These methods were used independently to estimate volumetric water content in the unsaturated zone and porosity in the saturated zone in a 100-m sandy section. Two sample sites along the profile were also chosen for a shallow geophysical investigation and soil sampling, to enable the calibration and verification of the indirect geophysical methods. The grain distribution at these sites is dominated by medium-sized sand (0.25–0.5 mm). The water content was 6.9 vol.% and calculated porosities are 37% and 40% respectively. At each of these sites the mean water content values calculated from resistivity are within one percentage unit of measured water content while those calculated from ground-penetrating radar give higher values by as much as 2.9 percentage units. The water contents in the unsaturated zone in the section, estimated from resistivity and ground-penetrating radar, show very similar trends, although that deduced from ground-penetrating radar is generally somewhat larger, consistent with the results from the sample sites. The mean porosity values obtained from the two methods in the saturated zone are in good agreement. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
