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Further development of the urban bioclimate model UBIKLIM, taking local wind systems into account

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The urban bioclimate model UBIKLIM is an application model providing an assessment on the influence of urban climate on human beings. On a calm summer’s day with fair weather conditions it calculates the meteorological parameters air temperature, humidity, wind velocity and short and long wave radiation based on a digital height model and appropriate land use information. These meteorological parameters determine the heat exchange conditions of human beings and thus can be analyzed with the help of the Klima-Michel model into physiologically significant terms. The result is a bioclimate map on a scale that is appropriate for climate-related planning in an urban environment. In urban areas lying in a distinct relief, a superimposed wind regime, such as a down valley wind, can modify the bioclimate considerably. Up to now it was not possible for UBIKLIM to take this situation into account. In this point UBIKLIM has been developed further, but its easily applicable character has been preserved. This has been realized, firstly by combining an orographically induced wind field with the one calculated in UBIKLIM as a function of land use esp. of urban structure, and secondly by introducing an algorithm by working out conveyance processes in the direction of the superposed wind field. UBIKLIM fills the gap between meso and micro scale models. Results of the further developed model are shown in the example of the city of Freiburg im Breisgau which is influenced by the distinct relief at the southern edge of the Black Forest.

Das Stadtbioklimamodell UBIKLIM ist ein Anwendungsmodell, das eine auf den Menschen bezogene Bewertung von Klima in Sta¨dten liefert. Fu¨r einen windschwachen sommerlichen Strahlungstag werden darin die physiologisch relevanten meteorologischen Gro¨ßen Lufttemperatur, Feuchte, Windgeschwindigkeit sowie lang- und kurzwellige Strahlung auf der Basis digitaler Ho¨hen- und Landnutzungsdaten berechnet. Die Analyse dieser Felder mit dem Klima-Michel Modell fu¨hrt zur Bioklimakarte, aus der sich planungsrelevante Aussagen ableiten lassen. Lokale Windsysteme, wie sie in Sta¨dten in orographisch gegliedertem Gela¨nde bedeutend sein ko¨nnen, konnten bislang nicht beru¨cksichtigt werden. An diesem Punkt wurde UBIKLIM erweitert, wobei weiterhin das Prinzip einer leichten und schnellen Anwendbarkeit des Verfahrens gewa¨hrleistet sein sollte. Dazu werden erstens ein topographisch induziertes, nutzungsunabha¨ngiges Windfeld und das durch die Stadtstruktur gegebene UBIKLIM-Windfeld gekoppelt, was fla¨chendeckend zu einer A¨nderung der Abku¨hlungsgro¨ße Wind fu¨hrt. Zweitens wird ein Algorithmus eingefu¨hrt, der in Richtung des u¨berlagerten Windfeldes Transportprozesse beru¨cksichtigt. Ergebnisse werden am Beispiel der Stadt Freiburg im Breisgau vorgestellt.
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Document Type: Research Article

Publication date: 2001-07-01

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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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