Implications of tree planting on pollutant dispersion in street canyons

摘要

Traffic pollutant dispersion processes inside urban street canyons with avenue-like tree plantinghave been studied in wind tunnel experiments. Tree planting of different crown porosities andtheir effects on the pollutant concentrations at the canyon walls have been investigated for windapproaching perpendicular to the street axis. The results show that avenue-like tree planting instreet canyons lead to overall increases in traffic originated pollutant concentrations in compari-son to the tree-free reference case. Maximum increases in concentrations of 80 % have beenmeasured at the building walls in the street canyon central part where the dispersion processesare affected strongest by tree planting.