Japan Geoscience Union Meeting 2016

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International Session (Poster)

Symbol A (Atmospheric and Hydrospheric Sciences) » A-GE Geological & Soil Environment

[A-GE05] Subsurface Mass Transport and Environmental Assessment

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Shoichiro Hamamoto(Department of Biological and Environmental Engineering, The University of Tokyo), Yasushi Mori(Graduate School of Environmental and Life Science, Okayama University), Hirotaka Saito(Department of Ecoregion Science, Tokyo University of Agriculture and Technology), Ken Kawamoto(Graduate School of Science and Engineering, Saitama University), Ming Zhang(Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology)

5:15 PM - 6:30 PM

[AGE05-P22] Tracking Wetting Front Seamlessly during Infiltration using Array Ground Penetrating Radar

Toshiki Iwasaki1, *Hirotaka Saito1, Seiichiro Kuroda2, Kohei Suzuki1 (1.Department of Ecoregion Science, Tokyo University of Agriculture and Technology, 2.National Institute for Rural Engineering, National Agriculture and Food Research Organization,)

As an array ground penetrating radar (GPR) electrically switches any antenna combinations sequentially in milliseconds, both common-offset gather (COG) and multi-offset gather (MOG) data can be acquired almost seamlessly. The main objective of this study was therefore to determine if COG and MOG surveys by the array GPR which allows 110 different antenna combinations could detect a wetting front during vertical field infiltration. An infiltration experiment was conducted at an experimental field inside Tottori Sand Dune, Japan. Time-lapse radargrams of COG and MOG by the array GPR clearly show the wetting front evolution with time. Reflection signals in MOG radargrams agree well with two-way travel times predicted from dielectric constant independently observed with a soil moisture sensor. This study confirms the usefulness of the array GPR for monitoring and quantifying the infiltration process in the field.