Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 315153
Title Fetch requirements near a forest edge
Author(s) Breugel, P.B. van; Klaassen, W.; Moors, E.J.
Source Physics and Chemistry of the Earth (B) 24 (1999)1/2. - ISSN 1464-1909 - p. 125 - 131.
Department(s) Winand Staring Centre for Integrated Land, Soil and Water Research
Publication type Refereed Article in a scientific journal
Publication year 1999
Abstract Measurements on forest-atmosphere exchange should be executed some distance from the forest boundaries to be representative for this forest. In this study the minimum fetch at measuring height is estimated by analysing measurements just above a mixed forest stand near the edge. The objective was to gain insight in the development of the Equilibrium Layer (EL) after a transition in vegetation height; only wind and shear stress were considered. The variations in u*/u and wind speed gradients above the canopy, as a function of wind direction and fetch were analysed. In this canopy roughness layer, stability corrections are small due to the large roughness of the forest. An adapted version of the model of Klaassen (1992) was used to simulate fluxes as well as gradients above the forest.It appeared that the disturbances from equilibrium arise not only from the forest edges, but also from the local changes in tree height between patches within the forest itself. A fetch:height ratio of 36 for the EL seemed appropriate for specific fetch directions at the site under study. This is in agreement with previous studies.
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