Spatial modeling of wind speed around windbreaks |
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Authors: | Olga Vigiak Geert Sterk Andrew Warren Lawrence J Hagen |
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Institution: | a Erosion and Soil and Water Conservation Group, Department of Environmental Sciences, Wageningen University, Nieuwe Kanaal 11, 6709 PA, Wageningen, The Netherlands;b Department of Geography, University College London, 26 Bedford Way, London WC1H 0AP, UK;c USDA-ARS Wind Erosion Research Unit, Throckmorton Hall, Kansas State University, Manhattan, KS 66506, USA |
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Abstract: | This paper presents a model to integrate windbreak shelter effects into a Geographic Information System (GIS). The GIS procedure incorporates the 1999 version windbreak sub-model of the Wind Erosion Prediction System (WEPS). Windbreak shelter is modeled in terms of friction velocity reduction, which is a function of wind speed and direction, distance from the barrier, windbreak height, porosity, width, and orientation. A first application of the model was conducted at a study area with an extensive windbreak network in England (Thetford, East Anglia). Windbreak characteristics (windbreak type, height, width, porosity, and location) were recorded. Porosity was estimated from digitized B/W silhouettes. To evaluate the network effectiveness, a windbreak network shelter index (SI) was proposed in terms of average reduction of friction velocity over the area due to network shelter. The network was found to give good protection, but the windbreak distribution was not optimal in relation to the wind vector distribution. |
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Keywords: | Windbreak Wind Erosion Prediction System GIS Wind speed reduction Wind erosion |
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