This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1002/2013WR014516 in citations.
Please use the identifier: http://hdl.handle.net/2128/17066 in citations.
Spatiotemporal relations between water budget components and soil water content in a forested tributary catchment
Spatiotemporal relations between water budget components and soil water content in a forested tributary catchment
We examined 3 years of measured daily values of all major water budget components (precipitation P, potential evapotranspiration PET, actual evapotranspiration ET, and runoff R) and volumetric soil water content θ of a small, forested catchment located in the west of Germany. The spatial distributio...
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Personal Name(s): | Graf, Alexander (Corresponding Author) |
---|---|
Bogena, Heye / Drüe, Clemens / Hardelauf, Horst / Pütz, Thomas / Heinemann, Günther / Vereecken, Harry | |
Contributing Institute: |
Agrosphäre; IBG-3 |
Published in: | Water resources research, 50 (2014) 6, S. 4837 - 4857 |
Imprint: |
Washington, DC
AGU
2014
|
DOI: |
10.1002/2013WR014516 |
Document Type: |
Journal Article |
Research Program: |
TRR 32: Muster und Strukturen in Boden-Pflanzen-Atmosphären-Systemen: Erfassung, Modellierung und Datenassimilation Terrestrial Systems: From Observation to Prediction Modelling and Monitoring Terrestrial Systems: Methods and Technologies Terrestrial Environmental Observatories |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/17066 in citations.
We examined 3 years of measured daily values of all major water budget components (precipitation P, potential evapotranspiration PET, actual evapotranspiration ET, and runoff R) and volumetric soil water content θ of a small, forested catchment located in the west of Germany. The spatial distribution of θ was determined from a wireless sensor network of 109 points with 3 measurement depths each; ET was calculated from eddy covariance tower measurements. The water budget was dominantly energy-limited, with ET amounting to approximately 90 % of PET, and a runoff ratio R/P of 56 %. P, ET and R closed the long-term water budget with a residual of 2% of precipitation. On the daily timescale, the residual of the water budget was larger than on the annual timescale, and explained to a moderate extent by θ (R² = 0.40). Wavelet analysis revealed sub-weekly timescales, presumably dominated by unaccounted fast-turnover storage terms such as interception, as a major source of uncertainty in water balance closure. At weekly resolution, soil water content explained more than half (R² = 0.62) of the residual. By means of combined empirical orthogonal function and cluster analysis, two slightly different spatial patterns of θ could be identified that were associated with mean θ values below and above 0.35 cm³/cm³, respectively. The timing of these patterns as well as the varying coherence between PET, ET and soil water content responded to changes in water availability, including a moderate response to the European drought in spring 2011. |