Combination of Measurement Methods for a Wide-Range Description of Hydraulic Soil Properties

Weninger, Thomas, Bodner, Gernot, Kreiselmeier, Janis, Chandrasekhar, Parvathy, Julich, Stefan, Feger, Karl-Heinz, Schwärzel, Kai and Schwen, Andreas, (2018). Combination of Measurement Methods for a Wide-Range Description of Hydraulic Soil Properties. Water, 10(8), 1-15

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  • Sub-type Journal article
    Author Weninger, Thomas
    Bodner, Gernot
    Kreiselmeier, Janis
    Chandrasekhar, Parvathy
    Julich, Stefan
    Feger, Karl-Heinz
    Schwärzel, Kai
    Schwen, Andreas
    Title Combination of Measurement Methods for a Wide-Range Description of Hydraulic Soil Properties
    Appearing in Water
    Volume 10
    Issue No. 8
    Publication Date 2018-08-02
    Place of Publication Basel
    Publisher Multidisciplinary Digital Publishing Institute (MDPI)
    Start page 1
    End page 15
    Language eng
    Abstract Established measurement methods for hydraulic soil properties cover a limited soil moisture range. Simulations of soil water dynamics based on such observations are therefore rarely representative for all conditions from saturation to drought. Recent technical developments facilitate efficient and cheap collecting of soil water characteristics data, but the quantitative benefit of extended measurement campaigns has not been adequately tested yet. In this study, a combination of four methods to measure water retention and hydraulic conductivity at different moisture ranges was applied. Evaporation method, dewpoint psychrometry, hood infiltrometer experiments, and falling head method for saturated conductivity were conducted at two experimental sites in eastern Austria. Effects of including the particular methods in the measurement strategy were examined by visual evaluation and a 1D-modelling sensitivity study including drainage, infiltration and drought conditions. The evaporation method was considered essential due to its broad measurement range both for water retention and hydraulic conductivity. In addition to that, the highest effect on simulated water balance components was induced by the inclusion of separate conductivity measurements near saturation. Water content after three days of drainage was 15 percent higher and the transpiration rate in a drought period was 22 percent higher without near-saturated conductivity measurements. Based on relative comparisons between different combinations, we suggested combining evaporation method and hood infiltrometer experiments as the basis for representative predictions of soil water dynamics.
    Keyword Hydraulic soil properties
    Soil water simulations
    Measurement method evaluation
    Functional evaluation
    Copyright Holder The Authors
    Copyright Year 2018
    Copyright type Creative commons
    DOI 10.3390/w10081021
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    Created: Mon, 20 Aug 2018, 19:31:06 JST by Claudia Matthias on behalf of UNU FLORES