Original paper

Influence of thermal effects on street canyon circulations

Bohnenstengel, Sylvia; Schlünzen, Katharina Heinke; Grawe, David

Meteorologische Zeitschrift Vol. 13 No. 5 (2004), p. 381 - 386

published: Oct 20, 2004

DOI: 10.1127/0941-2948/2004/0013-0381

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ArtNo. ESP025011305006, Price: 29.00 €

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Abstract

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.