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| Titel |
Partitioning of evaporation into transpiration, soil evaporation and interception: a comparison between isotope measurements and a HYDRUS-1D model |
| VerfasserIn |
S. J. Sutanto, J. Wenninger, A. M. J. Coenders-Gerrits, S. Uhlenbrook |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 8 ; Nr. 16, no. 8 (2012-08-10), S.2605-2616 |
| Datensatznummer |
250013415
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| Publikation (Nr.) |
 copernicus.org/hess-16-2605-2012.pdf |
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| Zusammenfassung |
| Knowledge of the water fluxes within the soil-vegetation-atmosphere system is
crucial to improve water use efficiency in irrigated land. Many studies have
tried to quantify these fluxes, but they encountered difficulties in
quantifying the relative contribution of evaporation and transpiration. In
this study, we compared three different methods to estimate evaporation
fluxes during simulated summer conditions in a grass-covered lysimeter in the
laboratory. Only two of these methods can be used to partition total
evaporation into transpiration, soil evaporation and interception. A water
balance calculation (whereby rainfall, soil moisture and percolation were
measured) was used for comparison as a benchmark. A HYDRUS-1D model and
isotope measurements were used for the partitioning of total evaporation. The
isotope mass balance method partitions total evaporation of 3.4 mm d−1 into 0.4 mm d−1 for soil evaporation, 0.3 mm d−1 for interception and 2.6 mm d−1 for
transpiration, while the HYDRUS-1D partitions total evaporation of 3.7 mm d−1
into 1 mm d−1 for soil evaporation, 0.3 mm d−1 for interception and 2.3 mm d−1 for
transpiration. From the comparison, we concluded that the isotope mass
balance is better for low temporal resolution analysis than the HYDRUS-1D. On
the other hand, HYDRUS-1D is better for high temporal resolution analysis
than the isotope mass balance. |
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