Windbreak Drag as Influenced by Porosity

INDBREAK width, porosity, and Wtl exibility all influence windspeed reduction lee of windbreaks. Atmos-pheric stability and surface roughness of the surounding area also affect wind-speed reduction (5)*. But windbreak porosity is the major factor (11). Classifying plant windbreaks on the basis of porosity would facilitate com-parisons of effectiveness among plant windbreaks. Also, experimental results from nonliving windbreaks usually are presented in terms of windbreak po-rosity; hence, the results would be easier to apply to plant windbreaks if they too were classified by porosit