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Jegede, Oluwagbemiga O. ; Foken, Thomas:
A Study of the Internal Boundary Layer due to a Roughness Change in Neutral Conditions Observed During the LINEX Field Campaigns.
In: Theoretical and Applied Climatology.
Bd. 62
(1999)
Heft 1-2
.
- S. 31-41.
ISSN 1434-4483
DOI: https://doi.org/10.1007/s007040050072
Abstract
As an aspect of the LINEX field studies (1996-97; Lindenberg near Beeskow, Germany), the characteristics of the internal boundary layer (IBL) that is associated with a step change of the surface roughnesses in neutral constant stress layers was investigated and is reported in this paper. Both smooth to rough (in 1996) and rough to smooth (in 1997) types of flow, have been studied based upon the profiles of mean wind and temperature realised from a 10-m mast and eddy correlation measurements taken at two levels (2 m and 5 m). Depending upon wind direction, the fetch at the site varied between 140 m and 315 m within the wind sector (200° to 340°) used for the field investigations. The height of the IBL, (delta), had been determined from the intersect of the logarithmic wind-profiles below ( 6 m) the interface. Values of (delta) obtained at the experimental site compared fairly well to the existing theoretical/empirical fetch-height relationships of the form: (delta) = a·xb, where a, b, are empirical constants. The ratio for the friction velocities below and above the IBL as measured directly by the eddy correlation technique showed that for fetches less than 250 m there was an increase (decrease) of about 20 % of the momentum flux arising from the smooth to rough (rough to smooth) transitions. Influences of distant obstructions (e.g. bushes, pockets of trees) on the surface flow were markedly important on the examined wind profiles and such can be indicative as multiple IBLs.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER7279 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Mikrometeorologie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 24 Sep 2015 09:38 |
| Letzte Änderung: | 24 Sep 2015 09:38 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/19712 |