 |
| Titel |
Physically-based modeling of topographic effects on spatial evapotranspiration and soil moisture patterns through radiation and wind |
| VerfasserIn |
M. Liu, A. Bárdossy, J. Li, Y. Jiang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 2 ; Nr. 16, no. 2 (2012-02-06), S.357-373 |
| Datensatznummer |
250013169
|
| Publikation (Nr.) |
 copernicus.org/hess-16-357-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| In this paper, simulations with the Soil Water Atmosphere Plant (SWAP) model
are performed to quantify the spatial variability of both potential and
actual evapotranspiration (ET), and soil moisture content (SMC) caused by
topography-induced spatial wind and radiation differences. To obtain the
spatially distributed ET/SMC patterns, the field scale SWAP model is applied
in a distributed way for both pointwise and catchment wide simulations. An
adapted radiation model from r.sun and the physically-based meso-scale
wind model METRAS PC are applied to obtain the spatial radiation and wind
patterns respectively, which show significant spatial variation and
correlation with aspect and elevation respectively. Such topographic
dependences and spatial variations further propagate to ET/SMC. A strong
spatial, seasonal-dependent, scale-relevant intra-catchment variability in
daily/annual ET and less variability in SMC can be observed from
the numerical experiments. The study concludes that topography has a
significant effect on ET/SMC in the humid region where ET is a energy limited
rather than water availability limited process. It affects
the spatial runoff generation through spatial radiation and wind,
therefore should be applied to inform hydrological model development. In
addition, the methodology used in the study can serve as a general method for
physically-based ET estimation for data sparse regions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|