TY  - JOUR
AU  - Schmalholz, J.
AU  - Stoffregen, H.
AU  - Kemna, A.
AU  - Yaramanci, U.
TI  - Imaging of water content distributions inside a lysimeter using GPR tomography
JO  - Vadose zone journal
VL  - 3
SN  - 1539-1663
CY  - Madison, Wis.
PB  - SSSA
M1  - PreJuSER-41398
SP  - 1106 - 1115
PY  - 2004
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000227469200007
UR  - https://juser.fz-juelich.de/record/41398
ER  -