 |
| Titel |
Upscaling of land-surface parameters through direct moment propagation |
| VerfasserIn |
H. Kunstmann |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7340
|
| Digitales Dokument |
URL |
| Erschienen |
In: Proceedings of the 8th Workshop for Large Scale Hydrological Modelling - Oppurg 2004 ; Nr. 5 (2005-12-16), S.127-131 |
| Datensatznummer |
250002177
|
| Publikation (Nr.) |
 copernicus.org/adgeo-5-127-2005.pdf |
|
|
|
|
|
| Zusammenfassung |
| A new methodology is presented that allows the upscaling of land surface
parameters of a Soil-Vegetation-Atmosphere-Transfer (SVAT) Model. Focus is set on the proper representation of
latent and sensible heat fluxes on grid scale at underlying subgrid-scale
heterogeneity. The objective is to derive effective land surface parameters
in the sense that they are able to yield the same heat fluxes on the grid
scale as the averaged heat fluxes on the subgrid-scale. A combination of
inverse modelling and Second-Order-First-Moment (SOFM) propagation is applied for the derivation of
effective parameters. The derived upscaling laws relate mean and variance
(first and second moment) of subgrid-scale heterogeneity to a corresponding
effective parameter at grid-scale. Explicit upscaling relations are
exemplary derived for a) roughness length, b) wilting point soil moisture,
and c) minimal stomata resistance. It is demonstrated that the SOFM-Method
yields congruent results to corresponding Monte Carlo simulations. Effective
parameters were found to be independent of driving meteorology and initial
conditions. |
| |
|
| Teil von |
|
|
|
|
|
|
|