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Flux–Profile Relationships Over a Fetch Limited Beech Forest

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Abstract

The influence of an internal boundary layer and a roughness sublayer on flux–profile relationships for momentum and sensible heat have been investigated for a closed beech forest canopy with limited fetch conditions. The influence was quantified by derivation of local scaling functions for sensible heat flux and momentum (Φ h and Φ m) and analysed as a function of atmospheric stability and fetch. For heat, the influences of the roughness sublayer and the internal boundary layer were in agreement with previous studies. For momentum, the strong vertical gradient of the flow just above the canopy top for some wind sectors led to an increase in Φ m, a feature that has not previously been observed. For a fetch of 500 m over the beech forest during neutral atmospheric conditions, there is no height range at the site where profiles can be expected to be logarithmic with respect to the local surface. The different influence of the roughness sublayer on Φ h and Φ m is reflected in the aerodynamic resistance for the site. The aerodynamic resistance for sensible heat is considerably smaller than the corresponding value for momentum.

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Authors and Affiliations

  1. Wind Energy and Atmospheric Department, Risoe National Laboratory, Frederiksborgvej 399, P.O. Box 49, 4000, Roskilde, Denmark

    Ebba Dellwik & Niels Otto Jensen

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  1. Ebba Dellwik
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  2. Niels Otto Jensen
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Correspondence to Ebba Dellwik.

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Dellwik, E., Jensen, N.O. Flux–Profile Relationships Over a Fetch Limited Beech Forest. Boundary-Layer Meteorol 115, 179–204 (2005). https://doi.org/10.1007/s10546-004-3808-y

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