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| Titel |
Analysis of effective resistance calculation methods and their effect on modelling evapotranspiration in two different patches of vegetation in semi-arid SE Spain |
| VerfasserIn |
A. Were, L. Villagarcía, F. Domingo, L. Alados-Arboledas, J. Puigdefábregas |
| 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 ; 11, no. 5 ; Nr. 11, no. 5 (2007-09-04), S.1529-1542 |
| Datensatznummer |
250009465
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| Publikation (Nr.) |
 copernicus.org/hess-11-1529-2007.pdf |
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| Zusammenfassung |
| Effective parameters are of major importance in modelling surface fluxes at
different scales of spatial heterogeneity. Different ways to obtain these
effective parameters for their use in meso-scale and GCM models have been
studied. This paper deals with patch-scale heterogeneity, where effective
resistances were calculated in two patches with different vegetation
(Retama sphaerocarpa (L.) Boiss shrubs, and herbaceous plants) using different methods:
aggregating soil and plant resistances in parallel, in series or by an
average of both. Effective aerodynamic resistance was also calculated
directly from patch fluxes. To assess the validity of the different methods
used, the Penman-Monteith equation was used with effective resistances to
estimate the total λE for each patch. The λE estimates found for each patch were
compared to Eddy Covariance system measurements. Results showed that for
effective surface resistances, parallel aggregation of soil and plant
resistances led to λE estimates closer to the measured λE in both patches
(differences of around 10%). Results for effective aerodynamic
resistances differed depending on the patch considered and the method used
to calculate them. The use of effective aerodynamic resistances calculated
from fluxes provided less accurate estimates of λE compared to the measured
values, than the use of effective aerodynamic resistances aggregated from
soil and plant resistances. The results reported in this paper show that the
best way of aggregating soil and plant resistances depends on the type of
resistance, and the type of vegetation in the patch. |
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