Combination of measurement methods for a wide-range description of hydraulic soil properties

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Thomas Weninger - , University of Natural Resources and Life Sciences, Vienna (Author)
  • Gernot Bodner - , University of Natural Resources and Life Sciences, Vienna (Author)
  • Janis Kreiselmeier - , Chair of Site Ecology and Plant Nutrition, United Nations University - Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES) (Author)
  • Parvathy Chandrasekhar - , Chair of Site Ecology and Plant Nutrition, United Nations University - Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES) (Author)
  • Stefan Julich - , Chair of Site Ecology and Plant Nutrition (Author)
  • Karl Heinz Feger - , Chair of Site Ecology and Plant Nutrition (Author)
  • Kai Schwärzel - , United Nations University - Institute for Integrated Management of Material Fluxes and of Resources (UNU-FLORES) (Author)
  • Andreas Schwen - , University of Natural Resources and Life Sciences, Vienna (Author)

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.

Details

Original languageEnglish
Article number1021
JournalWater (Switzerland)
Volume10
Issue number8
Publication statusPublished - 2 Aug 2018
Peer-reviewedYes

External IDs

ORCID /0000-0001-8948-1901/work/168717633

Keywords

Keywords

  • Functional evaluation, Hydraulic soil properties, Measurement method evaluation, Soil water simulations