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Wind fields in heterogeneous conifer canopies: parameterisation of momentum absorption using high-resolution 3D vegetation scans

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Abstract

Applications of flow models to tall plant canopies are limited, amongst other factors, by the lack of detailed information on vegetation structure. A method is presented to record 3D vegetation structure and make this information applicable to the derivation of turbulence parameters suitable for flow models. The relationship between wind speed, drag coefficient (C D ) and plant area density (PAD) was experimentally investigated in a mixed conifer forest in the lower part of the Eastern Ore Mountains. Essential information was gathered by collecting multi-level high-frequency wind velocity measurements and a dense 3D representation of the forest was obtained from terrestrial laser scanner data. Wind speed dependence or streamlining was observed for most of the wind directions. Edge effects, i.e. the influence of the here not regarded pressure gradient and the advective terms of the momentum equation, are assumed to cause this heterogeneity. Contrary to the hypothetic shelter effect, which would reduce the drag on sheltered plant parts, the calculated profiles of drag coefficients revealed an increasing C D with PAD (i.e. a dependence on canopy and plant structure).

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Acknowledgments

This study was supported by the ‘Deutsche Forschungsgemeinschaft’ (DFG SPP 1276 MetStröm) within the project ‘Turbulent Exchange processes between Forested areas and the Atmosphere’ (Grant BE 1721). We thank Dr. Christian Feigenwinter and Dr. Roland Vogt (University of Basel) for their logistical and scientific support and the technical staff of the Institute of Hydrology and Meteorology of the TUD. The authors would also like to thank Faro Europe GmbH for providing the laser scanner.

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Correspondence to Ronald Queck.

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Communicated by J. Bauhus.

This article belongs to the special issue ‘Wind Effects on Trees’.

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Queck, R., Bienert, A., Maas, HG. et al. Wind fields in heterogeneous conifer canopies: parameterisation of momentum absorption using high-resolution 3D vegetation scans. Eur J Forest Res 131, 165–176 (2012). https://doi.org/10.1007/s10342-011-0550-0

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  • DOI: https://doi.org/10.1007/s10342-011-0550-0

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