An experiment of wind-profile measurements above a maize crop was described.
Afficher plus [+] Moins [-]First the mean ratio between the height of the adapted layer and the fetch was deduced from profile measurements at several positions in the field.
Afficher plus [+] Moins [-]The height-to-fetch ratio amounted to 1/64.
Afficher plus [+] Moins [-]Because of too small a fetch, the vertical transport of momentum between the maize crop and the atmosphere could not be estimated accurately enough from the windprofile measurements only.
Afficher plus [+] Moins [-]The parameters of the assumed logarithmic wind profile, the zero-plane displacement and the roughness length, could only be estimated from a comparison of wind-profile measurements with simultaneous eddy-correlation measurements.
Afficher plus [+] Moins [-]In the present experiment, the zeroplane displacement d and the roughness length z0 could be expressed in the height h of the full-grown crop as d = 0.5 h and z0 = 0.11 h, respectively.
Afficher plus [+] Moins [-]The application of a common empirical relationship from the literature (e.g.
Afficher plus [+] Moins [-]D = 0.6 h) led to considerable systematic errors of the estimated friction velocity above maize.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Editeur for Agricultural Pub. and Documentation | Wageningen : Centre for Agricultural Pub. and Documentation, 1978
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