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A note on local and non-local properties of turbulence in the bora flow

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Abstract:

On the basis of two-month measurements of the bora wind at Senj, Croatia, with a 1 s temporal resolution, properties of the bora turbulence are inspected using the records of three bora episodes. The spectrum is divided into two parts: high-frequency turbulence (periods less than 1 min) and the low-frequency part (periods between 1 and 10 min) where pulsations appear. We have found that the high-frequency turbulence is generated locally by surface roughness and local wind shear. On the other hand, the low-frequency turbulence, i.e. the pulsations, seems to be independent of the local properties and can therefore be treated as an organized non-local effect. This is in accordance with the studies of the pulsations in the Boulder downslope windstorm.

German
Das Verhalten der Bora Turbulenz in Senj, Kroatien, während einer zweimonatigen Messperiode mit 1 sec Auflösung, wurde untersucht. Das Spektrum wurde unterteilt in einen Bereich hoher Frequenz (Perioden kleiner als 1 min) und einen Bereich niedriger Frequenz (Perioden zwischen 1 und 10 min). Hochfrequente Turbulenz wird im allgemeinen durch lokale Gegebenheiten, wie Oberflächenrauhigkeit und lokale Windscherung, verursacht. Die Turbulenz niedriger Frequenz des zweiten Bereichs dagegen scheint von lokalen Gegebenheiten unabhängig zu sein. Diese Pulsationen gleichen jenen, die in den Boulder Fallwinden gefunden wurden.

Document Type: Research Article

DOI: https://doi.org/10.1127/0941-2948/2006/0127

Publication date: 2006-06-01

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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