to enhance the understanding of the impact of obstacle buildings on pollution transportationand dispersion in the atmospheric boundary layer, it is necessary to know the atmospheric flow characteristics over terrains. wind flow characteristics in a boundary layer over a step-shaped cliff topography model with rough and smooth surfaces were studied numerically using computational fluid dynamics ...

Densities of an herbivorous pest may be impacted by landscape and orchard architecture. We present two orchard experiments where the densities of the Asian citrus psyllid (Diaphorina citri) were compared depending on: (1) the presence or absence of a windbreak and (2) if the orchards consisted of a solid set re-planting or an orchard with a mixture of mature and reset-replacement trees. Psyllid...

i Abstract In the present study, the effect of the trees in windbreaks on the leeward airflow is investigated, for the first time, employing numerical models. Different arrangements of windbreaks have been considered: (i) a single row of cypress trees, (ii) two rows of cypress trees and (iii) two rows of cypress trees with a low hedge that represent shrubs in the first row. The RANS equations h...