Estimating the Zero-Plane Displacement and Roughness Length for Tall Vegetation and Forest Canopies Using Semi-empirical Wind Profiles

N. M. Zoumakis Laboratory of Atmospheric Physics, Technological Education Institute of Macedonia, Thessaloniki, Greece

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Abstract

A simple method based on a mass-conservation principle is presented for estimating the aerodynamic characteristics of forest and tall vegetation canopies. The method uses semi-empirical modifications of the profiles in the transition layer, eliminating the need for measured wind data extending into the logarithmic regime. Also, various schemes are presented for determining the transition-layer depth z* in terms of the particular physical characteristics of the canopy.

Abstract

A simple method based on a mass-conservation principle is presented for estimating the aerodynamic characteristics of forest and tall vegetation canopies. The method uses semi-empirical modifications of the profiles in the transition layer, eliminating the need for measured wind data extending into the logarithmic regime. Also, various schemes are presented for determining the transition-layer depth z* in terms of the particular physical characteristics of the canopy.

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