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Climatology of wind profile parameter estimates above a growing pine forest

Klimatologie der Windprofilparameter eines wachsenden Waldes

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Summary

The Department of Meteorology of Freiburg University is managing a microclimatological experimental site in a Scotch pine forest (Pinus silvestris L.) near Hartheim/Rhine in southern Germany. Measurements have been taken since the early seventies. The investigations at this measuring station also encompass recordings of wind direction and wind speed. The mean hourly wind speed values, measured in five heights above the trees, have now been recorded for ten consecutive years. An analysis of these records follows.

We calculated the hours of neutral atmospheric stratification by means of the local Richardson number. During these hours friction velocityu *, zero-plane displacementd and roughness lengthz 0 in the adiabatic surface layer of the atmosphere were determined. This enabled us to correlate the three parameters of the wind profile with the development of the geometry of the stand. The conclusion of the paper consists of further statistical statements about the wind speed above the growing forest.

Zusammenfassung

Das Meteorologische Institut der Universität Freiburg betreibt eine mikroklimatologische Meßstation in einem Kiefernwald (Pinus silvestris L.) bei Hartheim/Rhein in Südwestdeutschland. Die Messungen wurden Anfang der siebziger Jahre begonnen. Gemessen werden neben anderen Größen zur Bestimmung des Wärme- und Wasserhaushaltes auch Windrichtung und Windgeschwindigkeiten. Es liegen nun zehn Jahre ununterbrochene Meßreihen der Windgeschwindigkeit in fünf Niveaus auf Stundenbasis vor. Dieses Datenmaterial wird hier untersucht.

Die Stunden in denen die Atmosphäre neutral geschichtet war, wurden mit Hilfe der local Richardson number bestimmt. In diesen Zeiträumen konnte die Schubspannungsgeschwindigkeitu *, die Nullpunktverschiebung d und die Rauhigkeitslängez 0 errechnet werden. Anschließend werden die drei Windprofilparameter mit den Bestandshöhen in Beziehung gesetzt. Abschließend werden weitere statistische Untersuchungen zur Windgeschwindigkeit über diesem noch wachsenden Kiefernwald mitgeteilt.

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  1. Meteorologisches Institut der Universität Freiburg, Werderring 10, D-7800, Freiburg, Germany

    L. Jaeger

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  1. L. Jaeger
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Jaeger, L. Climatology of wind profile parameter estimates above a growing pine forest. Arch. Met. Geoph. Biocl., Ser. B 34, 163–179 (1984). https://doi.org/10.1007/BF02275682

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  • DOI: https://doi.org/10.1007/BF02275682

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