Impact of initial and boundary conditions on preferential flow |
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Authors: | Ingrid Hincapi ,Peter F. Germann |
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Affiliation: | aSoil Science Section, Department of Geography, University of Bern, Hallerstrasse 12, CH-3012 Bern, Switzerland |
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Abstract: | Preferential flow in soil is approached by a water-content wave, WCW, that proceeds downward from the ground surface. WCWs were obtained from sprinkler experiments with infiltration rates varying from 5 to 40 mm h− 1. TDR-probes and tensiometers measured volumetric water contents θ(z,t) at seven depths, and capillary heads, h(z,t) at six depths in a column of an undisturbed soil. The wave is characterized by the velocity of the wetting front, cW, the amplitude, wS, and the final water content, θ. We tested with uni-variate and bi-variate linear regressions the impacts of initial volumetric water contents, θini, and input rates, qS, on cW, wS and θ.The test showed that θini influenced θ and wS and qS effected cW. The expected proportionality of wS ≈ qs1/3 was weak and cW ≈ qs2/3 was strong. |
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Keywords: | Water-content waves Preferential flow TDR-technique |
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