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| Titel |
The effect of water storage change in ET estimation in humid catchments
based on water balance models and Budyko framework |
| VerfasserIn |
Tingting Wang, Fubao Sun, Changming Liu, Wenbin Liu, Hong Wang |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250142666
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| Publikation (Nr.) |
 EGU/EGU2017-6311.pdf |
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| Zusammenfassung |
| An accurate estimation of ET in humid catchments is essential in water-energy budget
research and water resource management etc, while it remains a huge challenge and there is
no well accepted explanation for the difficulty of annual ET estimation in humid catchments
so far. Here we presents the ET estimation in 102 humid catchments over China based on the
Budyko framework and two hydrological models: abcd model and Xin’anjiang mdoel, in
comparison with ET calculated from the water balance equation (ETwb) on the ground that
the ΔS is approximately zero at multiannual and annual time scale. We provides a possible
explanation for this poorly annual ET estimation in humid catchments as well. The
results show that at multi-annual timescale, the Budyko framework works fine in ET
estimation in humid catchments, while at annual time scale, neither the Budyko
framework nor the hydrological models can estimate ET well. The major cause for
this poorly estimated annual ET in humid catchments is the neglecting of the ΔS
in ETwb since it enlarge the variability of real actual evapotranspiration. Much
improvement has been made when compared estimated ET + ΔS with those ETwb, and the
bigger the catchment area is, the better this improvement is. It provides a reasonable
explanation for the poorly estimated annual ET in humid catchments and reveals the
important role of the ΔS in ET estimation and validation. We highlight that the annual
ΔS shouldn’t be taken as zero in water balance equation in humid catchments. |
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