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Titolo:
THE INFLUENCE OF SURFACE TEXTURE ON THE EFFECTIVE ROUGHNESS LENGTH
Autore:
SCHMID HP; BUNZLI B;
Indirizzi:
SWISS FED INST TECHNOL,GGIETH,WINTERTHURERSTR 190 CH-8057 ZURICH SWITZERLAND
Titolo Testata:
Quarterly Journal of the Royal Meteorological Society
fascicolo: 521, volume: 121, anno: 1995,
parte:, A
pagine: 1 - 21
SICI:
0035-9009(1995)121:521<1:TIOSTO>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUMERICAL 3-DIMENSIONAL MODELS; BOUNDARY-LAYER; TERRAIN; FLUXES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
H.P. Schmid e B. Bunzli, "THE INFLUENCE OF SURFACE TEXTURE ON THE EFFECTIVE ROUGHNESS LENGTH", Quarterly Journal of the Royal Meteorological Society, 121(521), 1995, pp. 1-21

Abstract

It has recently become common practice to parametrize vertical momentum transfer, due to subgridscale motions over inhomogeneous areas, by a grid-cell averaged effective roughness length, z(0)(eff), based on the concept of a blending height. Here, it is argued that the requirement that z(0)(eff) be determined above a blending height is not a sufficient condition for its parametrization. Results from a numerical experiment are presented which suggest that z(0)(eff) is strongly modulated by the texture of surface variability. These results demonstrate that the neglect of subgridscale surface texture may lead to an underestimation of z(0)(eff) by up to an order of magnitude. Surface texture, or the spatial relationship between different roughness patches, is interpreted as being of a 'second-order roughness', by which the regular 'first-order roughness' is enhanced owing to the asymmetry of local advection across surface-type transitions. It is submitted for further discussion that texture analysis provides a framework for the objectivequantification of this net effect of subgridscale processes or 'second-order roughness'. In the appendix, the how models used in this studyare verified by comparing them with the micrometeorological observations of Bradley.

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Documento generato il 25/11/20 alle ore 07:29:11