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HRADIL MILOSLAV. 2014. Simulation of the Eff ect of Windbreaks on Airfl ow with the WAsP Engineering Program. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 62(3): 487–494. A number of technical complications go hand in hand with the reality of research on the eff ectiveness of windbreaks. Direct wind measuring in the windbreak area must be linked to specifi c meteorological situations that are not very frequent. A limiting factor for more frequent fi eld measuring is also the development of surrounding areas of windbreaks. It is for these reasons that indirect methods are becoming more important. This work simulates the eff ect of several windbreaks in Southern Moravia (Czech Republic, Central Europe), on the modifi cation of wind speed with the aid of the WAsP Engineering program. The windbreaks were defi ned in the program environment as a threedimensional obstacles which some parameters – primarily porosity – amended as necessary during the calculation. The model results were compared with data on the wind speed from fi eld measuring under the conditions of fresh fl ow perpendicular to the windbreak. The average absolute values of diff erences between the measured and model-calculated wind speed round about the windbreaks varied from 0.4 till 0.9 m.s −1 , the greatest diff erences were located very close to the windbreaks (typically 50 m on leeward side). Data about the windbreak’s optical porosity based on digital photographs, obtained during performed measuring of wind speed, were also used.

Simulation of the Effect of Windbreaks on Airflow with the WAsP Engineering Program