GRANT, Eleanor R.; ROSS, Andrew N.; GARDINER, Barry; MOBBS, Stephen D.

doi:10.1007/s10546-015-0015-y

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GRANT, Eleanor R.
University of Leeds
Natural Environment Research Council [NERC]

ROSS, Andrew N.
University of Leeds

GARDINER, Barry
Interactions Sol Plante Atmosphère [UMR ISPA]
Forest Research [Great Britain]

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Boundary-Layer Meteorology. 2015, vol. 156, n° 2, p. 231-251

Springer Verlag

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The investigation of airflow over and within forests in complex terrain has been, until recently, limited to a handful of modelling and laboratory studies. Here, we present an observational dataset of airflow measurements inside and above a forest situated on a ridge on the Isle of Arran, Scotland. The spatial coverage of the observations all the way across the ridge makes this a unique dataset. Two case studies of across-ridge flow under near-neutral conditions are presented and compared with recent idealized two-dimensional modelling studies. Changes in the canopy profiles of bothmean wind and turbulent quantities across the ridge are broadly consistent with these idealized studies. Flow separation over the lee slope is seen as a ubiquitous feature of the flow. The three-dimensional nature of the terrain and the heterogeneous forest canopy does however lead to significant variations in the flow separation across the ridge, particularly over the less steep western slope. Furthermore, strong directional shear with height in regions of flow separation has a significant impact.< Réduire

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complex terrain

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atmospheric boundary layer

flow separation

forest canopy

hills

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Field observations of canopy flows over complex terrain

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