Summary
A mathematical description is presented for the profiles of wind speed and air temperature measured above a short grass vegetation surrounded by irregular and inhomogeneous terrain. This “ln-profile” [u=A(lnz)B and Θ=C+D(lnz)E] is applicable both under stable and unstable conditions. The validity, under these conditions, of the Swinbank and Keyps-theories for the turbulent transfer of heat and momentum is tested with a comparison of calculated friction velocities. Although the relationships found are not as well-defined as under more homogeneous conditions, the variations found in the transfer parameters are dependent on stability more than on the homogeneity of the surrounding area.
Zusammenfassung
Es wird eine mathematische Formel für die Windgeschwindigkeits- und Temperaturprofile gegeben, die über einer kurz geschnittenen Grasfläche, welche von ungleichförmigem und inhomogenem Gelände umgeben ist, gemessen wurden. Diese “ln-Profile” [u=A(lnz)B und Θ=C+D(lnz)E] sind sowohl in stabilen als auch in unstabilen Lagen anwendbar. Es wird die Gültigkeit der Swinbank- und Keups-Theorien für den turbulenten Transport von Wärme und Impuls unter diesen Bedingungen durch den Vergleich mit den berechneten Reibungs-geschwindigkeiten geprüft. Obwohl die gefundenen Beziehungen nicht so gut wie unter besser homogenen Bedingungen bestimmt sind, lassen die gefundenen Schwankungen der Übertragungsparameter eine stärkere Abhängigkeit von der Stabilität als von der Homogenität der Umgebung erkennen.
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Schneider, T. Wind profiles and heat transfer above a short grass surface surrounded by irregular terrain. Arch. Met. Geoph. Biokl. B. 19, 233–250 (1971). https://doi.org/10.1007/BF02253551
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DOI: https://doi.org/10.1007/BF02253551