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Wind-Flow Dynamics Over a Vineyard

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Abstract

Wind-flow dynamics has been extensively studied over horizontally uniform canopies, but agricultural plantations structured in rows such as vineyards have received less attention. Here, the wind flow over a vineyard is studied in neutral stratification from both large-eddy simulation (LES) and in situ measurements. The impact of row structure on the wind dynamics is investigated over a range of wind directions from cross-row to down-row, and a typical range of row aspect ratio (row separation/height ratio). It is shown that the mean flow over a vineyard is similar to that observed in uniform canopies, especially for wind directions from cross-row to diagonal. For down-row winds, the mean flow exhibits noticeable spatial variability across each elementary row-gap pattern, as the wind is channeled in the inter-row. This spatial variability increases with the aspect ratio. With down-row winds the turbulent structures are also more intermittent and generate larger turbulent kinetic energy and momentum flux. The displacement height and roughness length of the vineyard vary with the aspect ratio in a way similar to their variation with canopy density in uniform canopies. Both parameters take smaller values in down-row wind flow, for which the canopy appears more open. The analysis of velocity spectra and autocorrelation functions shows that vineyard canopies share similar features to uniform canopies in terms of turbulent coherent structures, with only minor changes with wind direction.

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Acknowledgments

This study is part of the Modapex project, funded by ADEME under contract 1062C0014, through the Pesticides Programme (APR 2009). The EA Department of INRA and SupAgro Montpellier are gratefully acknowledged for having provided a 3-year PhD Grant to Dr. Ali Chahine. The authors would like to thank Didier Garrigou and Dr. Mark R. Irvine for their contribution to the data collection and processing. Computer simulations related to this work were performed using Ephyse cluster. Thanks are expressed to the Ephyse computing team (in particular Patrick Moreau, Guy Pracros, and Tovo Rabemanantsoa) for their help with the cluster set-up and administration. Both referees are gratefully acknowledged.

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Authors and Affiliations

  1. INRA, UMR1391 ISPA, 33140 , Villenave d’Ornon, France

    Ali Chahine, Sylvain Dupont & Yves Brunet

  2. Montpellier SupAgro, 34060 , Montpellier, France

    Carole Sinfort

Authors
  1. Ali Chahine
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  2. Sylvain Dupont
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  3. Carole Sinfort
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  4. Yves Brunet
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Correspondence to Sylvain Dupont.

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Chahine, A., Dupont, S., Sinfort, C. et al. Wind-Flow Dynamics Over a Vineyard. Boundary-Layer Meteorol 151, 557–577 (2014). https://doi.org/10.1007/s10546-013-9900-4

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  • DOI: https://doi.org/10.1007/s10546-013-9900-4

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