Combination of measurement methods for a wide-range description of hydraulic soil properties
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
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 language | English |
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Article number | 1021 |
Journal | Water (Switzerland) |
Volume | 10 |
Issue number | 8 |
Publication status | Published - 2 Aug 2018 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0001-8948-1901/work/168717633 |
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Keywords
ASJC Scopus subject areas
Keywords
- Functional evaluation, Hydraulic soil properties, Measurement method evaluation, Soil water simulations