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000041398 084__ $$2WoS$$aEnvironmental Sciences
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000041398 084__ $$2WoS$$aWater Resources
000041398 1001_ $$0P:(DE-HGF)0$$aSchmalholz, J.$$b0
000041398 245__ $$aImaging of water content distributions inside a lysimeter using GPR tomography
000041398 260__ $$aMadison, Wis.$$bSSSA$$c2004
000041398 300__ $$a1106 - 1115
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000041398 440_0 $$010301$$aVadose Zone Journal$$v3$$x1539-1663
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000041398 520__ $$aIn a study to investigate water content distributions inside a lysimeter in a noninvasive manner, we used ground penetrating radar (GPR) tomography. Our main objective was to evaluate the temporal changes and spatial distributions of the volumetric water content after a short but intensive irrigation of part of the lysimeter. High frequency GPR antennas of 1-GHz nominal frequency were used because of the small dimensions of the investigated lysimeter (cylinder of 1.5-m and 1.2-m diameter) and the desired spatial resolution in the range of decimeters. To ensure a relatively steady distribution of water inside the lysimeter for the time-consuming tomographic survey, simple parallel transmission measurements were used to track the water dynamics. Water contents and water content changes were calculated by means of a mixing formula describing the relation between electromagnetic wave propagation velocity and the water content. The transmission measurements indicate a diffusive process following the irrigation for a duration of several hours. The tomographic measurements clearly show the area of increased water content associated with the irrigation.
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000041398 7001_ $$0P:(DE-HGF)0$$aStoffregen, H.$$b1
000041398 7001_ $$0P:(DE-Juel1)VDB736$$aKemna, A.$$b2$$uFZJ
000041398 7001_ $$0P:(DE-HGF)0$$aYaramanci, U.$$b3
000041398 773__ $$0PERI:(DE-600)2088189-7$$gVol. 3, p. 1106 - 1115$$p1106 - 1115$$q3<1106 - 1115$$tVadose zone journal$$v3$$x1539-1663$$y2004
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