%0 Journal Article
%A Schmalholz, J.
%A Stoffregen, H.
%A Kemna, A.
%A Yaramanci, U.
%T Imaging of water content distributions inside a lysimeter using GPR tomography
%J Vadose zone journal
%V 3
%@ 1539-1663
%C Madison, Wis.
%I SSSA
%M PreJuSER-41398
%P 1106 - 1115
%D 2004
%Z Record converted from VDB: 12.11.2012
%X In a study to investigate water content distributions inside a lysimeter in a noninvasive manner, we used ground penetrating radar (GPR) tomography. Our main objective was to evaluate the temporal changes and spatial distributions of the volumetric water content after a short but intensive irrigation of part of the lysimeter. High frequency GPR antennas of 1-GHz nominal frequency were used because of the small dimensions of the investigated lysimeter (cylinder of 1.5-m and 1.2-m diameter) and the desired spatial resolution in the range of decimeters. To ensure a relatively steady distribution of water inside the lysimeter for the time-consuming tomographic survey, simple parallel transmission measurements were used to track the water dynamics. Water contents and water content changes were calculated by means of a mixing formula describing the relation between electromagnetic wave propagation velocity and the water content. The transmission measurements indicate a diffusive process following the irrigation for a duration of several hours. The tomographic measurements clearly show the area of increased water content associated with the irrigation.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000227469200007
%U https://juser.fz-juelich.de/record/41398