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Flow Separation in the Lee of a Crater Rim

Lehner, Manuela; Whiteman, C. David; Hoch, Sebastian W.; Adler, Bianca; Kalthoff, Norbert

Abstract:
The nearly circular Meteor Crater, Arizona, is located on an extensive, slightly sloping plain, above which a south-westerly katabatic flow forms during undisturbed, clear-sky nights. For the katabatic flow over the upstream crater rim, the resulting flow regime in the lee depends on the upstream wind speed. For a shallow katabatic flow with a wind-speed maximum of about 5 m s −1
−1
or less at a height of about 20 m above the ground, the flow decelerates as it approaches the crater. Cold-air intrusions form, that is, cold air spills over the crater rim and runs down the inner south-west sidewall. For a deep katabatic flow with a wind-speed maximum located above the 50-m high measurement tower and comparatively higher wind speeds, the flow accelerates towards the crater. The flow separates in the immediate lee of the crater rim, forming a wake over the south-west crater sidewall. The wake can either be small, affecting only the upper part of the sidewall, or large, affecting the entire crater sidewall or even the crater floor. When flow separation occurs, the wake region over the crater sidewall is characterized by low wind speeds and potentially a return circulation near the surface. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000096948
Veröffentlicht am 15.10.2019
Originalveröffentlichung
DOI: 10.1007/s10546-019-00466-z
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0006-8314, 1573-1472
KITopen-ID: 1000096948
HGF-Programm 12.01.02 (POF III, LK 01)
Erschienen in Boundary layer meteorology
Band 173
Heft 2
Seiten 263-287
Vorab online veröffentlicht am 23.07.2019
Schlagworte Flow over topography; Lee vortex; METCRAX II; Wake formation
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