Title: Pollutant removal mechanism in two-dimensional street canyons: a laboratory study

Authors: Annalisa Di Bernardino; Paolo Monti; Giovanni Leuzzi; Giorgio Querzoli

Addresses: Dipartimento di Ingegneria Civile Edile e Ambientale, Università di Roma La Sapienza, Via Eudossiana 18, 00184, Rome, Italy ' Dipartimento di Ingegneria Civile Edile e Ambientale, Università di Roma La Sapienza, Via Eudossiana 18, 00184, Rome, Italy ' Dipartimento di Ingegneria Civile Edile e Ambientale, Università di Roma La Sapienza, Via Eudossiana 18, 00184, Rome, Italy ' Dipartimento di Ingegneria Civile, Ambientale e Architettura, Università di Cagliari, Via Marengo 3, 09123, Cagliari, Italy

Abstract: Velocity and concentration fields have been measured simultaneously in the water channel to quantify the turbulent dispersion of a passive tracer emitted at street level by a line source within an idealised urban canyon. The experiment has been conducted for an arrangement of two-dimensional obstacles with aspect ratio unity. Statistical moments of velocity and concentration have been calculated with high spatial resolution. Furthermore, the simultaneous measure of velocity and concentration at the same point made it possible to determine the tracer flux in the whole domain as well as to quantify the removal and re-entrainment of the pollutant through the canyon top.

Keywords: street canyon; concentration flux; concentration peaks; water channel; line source; building; urban canopy; skimming flow; image analysis; planar laser-induced fluorescence; PLIF.

DOI: 10.1504/IJEP.2017.089415

International Journal of Environment and Pollution, 2017 Vol.62 No.2/3/4, pp.291 - 304

Received: 22 Aug 2016
Accepted: 27 Feb 2017
Published online: 23 Jan 2018 *

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