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Analysis of diabatic flow modification in the internal boundary layer

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Measurements at two meteorological masts in Denmark, Horns Rev in the sea and Høvsøre near the coastline on land, are used to analyze the behaviour of the flow after a smooth-to-rough change in surface conditions. The study shows that the wind profile within the internal boundary layer is controlled by a combination of both downstream and upstream stability and surface roughness conditions. A model based on a diffusion analogy is able to predict the internal boundary layer height well. Modeling the neutral and long-term wind profile with a 3 layer linear interpolation scheme gives good results at Høvsøre. Based on a comparison with a numerical model and the measurements, the constants in the interpolation scheme are slightly adjusted, which yields an improvement for the description of the wind profile in the internal boundary layer.

Das Strömungsverhalten an einem glatt-zu-rauh Übergang an einer Küstenlinie wird anhand von Messungen an zwei Masten in Dänemark, Horns Rev im Wasser in der Nordsee und Høvsøre kurz hinter der Küste an Land, untersucht. Es zeigt sich, dass die Windprofile in der internen Grenzschicht durch eine Kombination der Stabilitäten und Rauigkeiten stromauf und stromab der Küstenlinie bestimmt werden. Die Höhe der internen Grenzschicht kann gut durch ein auf der Diffusionsanalogie basierendem Modell vorhergesagt werden. Die Modellierung des neutralen und des längerfristig gemittelten Windprofils mit einem linearen Dreischichten-interpolationsansatz ergibt für Høvsøre gute Ergebnisse. Die Konstanten des Interpolationsansatzes werden auf Grund des Vergleichs zu den Messungen leicht angepasst, was eine Verbesserung der Beschreibung des Windprofils in der internen Grenzschicht bewirkt.
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Document Type: Research Article

Publication date: 2011-12-01

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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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