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Coherences between upper air flow and channelling mechanism in the Baar Basin

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Abstract:

Frequency and consistency analysis permit a differentiation of channelling effects dependent on geostrophic and surface wind directions for the valley-like mountain basin "Baar" in southwest Germany. During the day, dynamically forced and thermally driven channelling effects are evident, whereas during the night, thermally driven and pressure-induced channelling effects predominate. As a result, quasi-periodic variations of surface wind directions occur daily. The greatest consistency of these wind directions appear during the daytime in connection with forced channelling effects and during the night as a result of thermally driven channelling.

Ha¨ufigkeits- und Consistencyanalysen gestatten fu¨r eine tala¨hnlich geformte Gebirgsmulde (Baar) der humiden mittleren Breiten eine Differenzierung der Kanalisierungseffekte in Abha¨ngigkeit von den geostrophischen und den Bodenwindrichtungen sowie der Topographie. In den Tagesstunden sind bevorzugt dynamisch erzwungene und thermisch bedingte Kanalisierungseffekte, in den Nachtstunden thermisch bedingte und druckinduzierte Kanalisierungseffekte wirksam. Dadurch ergeben sich im Tagesablauf charakteristische Bodenwindrichtungsabfolgen. Gro¨ßte Windrichtungsbesta¨ndigkeit (Consistency) tritt in den Tagesstunden in Verbindung mit erzwungenen Kanalisierungseffekten, in den Nachtstunden bei thermisch bedingter Kanalisierung auf.

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Document Type: Research Article

DOI: https://doi.org/10.1127/0941-2948/2003/0012-0217

Publication date: 2003-08-01

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