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Influence of thermal effects on street canyon circulations

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A numerical study has been carried out to investigate the influence of large-scale thermal effects and strong local-scale temperature gradients near the ground on the circulation inside a street canyon. The results show that the dynamical forcing dominates the circulation inside a street canyon. But this forcing is influenced by the large-scale thermal stability. Thus, atmospheric stability indirectly controls the street canyon circulation. Small temperature gradients inside the street-canyon are neutralised by the external dynamical forcing. Strong temperature gradients inside the street-canyon show an impact on the street canyon circulation. While stable stratification reduces the circulation for the building configuration investigated, convective stratification seems to intensify it.

Anhand numerischer Simulationen wird der Einfluss groBräumiger thermischer Schichtungen und starker lokaler Temperaturgradienten in Bodennähe auf die Zirkulation innerhalb einer StraBenschlucht untersucht. Die Ergebnisse zeigen, dass der dynamische Antrieb die Zirkulation innerhalb einer StraBenschlucht dominiert. Aber dieser Antrieb wird durch die mesoskalige thermische Schichtung beeinflusst. Demnach verändert die atmosphärische Schichtung die Zirkulation innerhalb einer StraBenschlucht indirekt. Geringe Temperaturgradienten innerhalb der StraBenschlucht werden durch den externen dynamischen Antrieb neutralisiert. Starke Temperaturgradienten innerhalb der StraBenschlucht zeigen einen Einfluss auf die Zirkulation innerhalb der StraBenschlucht. Während eine stabile Schichtung die Zirkulation für die verwendete Modellkonfiguration abschwächt, verstärkt eine konvektive Schichtung die Zirkulation.
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Document Type: Research Article

Publication date: 2004-10-01

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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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