Impact of roof height non-uniformity on pollutant transport between a street canyon and intersectionsle

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F17%3A00476809" target="_blank" >RIV/61388998:_____/17:00476809 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.envpol.2017.03.073" target="_blank" >http://dx.doi.org/10.1016/j.envpol.2017.03.073</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.envpol.2017.03.073" target="_blank" >10.1016/j.envpol.2017.03.073</a>

Result language

angličtina

Original language name

Impact of roof height non-uniformity on pollutant transport between a street canyon and intersectionsle

Original language description

This paper presents an extension of our previous wind-tunnel study (Nosek et al., 2016) in which we highlighted, the need for investigation of the removal mechanisms of traffic pollution from all openings of a 3D street canyon. The extension represents the pollution flux (turbulent and advective) measurements at the lateral openings of three different 3D street canyons for the winds perpendicular and oblique to the along-canyon axis. The pollution was simulated by emitting a passive gas (ethane) from a homogeneous ground-level line source positioned along the centreline of the investigated street canyons. The street canyons were formed by courtyard-type buildings of two different regular urban-array models. The first model has a uniform building roof height, while the second model has a non-uniform roof height along each building's wall. The mean flow and concentration fields at the canyons' lateral openings confirm the findings of other studies that the buildings' roof-height variability at the intersections plays an important role in the dispersion of the traffic pollutants within the canyons. For the perpendicular wind, the non-uniform roof-height canyon appreciably removes or entrains the pollutant through its lateral openings, contrary to the uniform canyon, where the pollutant was removed primarily through the top. The analysis of the turbulent mass transport revealed that the coherent flow structures of the lateral momentum transport correlate with the ventilation processes at the lateral openings of all studied canyons. These flow structures coincide at the same areas and hence simultaneously transport the pollutant in opposite directions.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

<a href="/en/project/GA15-18964S" target="_blank" >GA15-18964S: Experimental study of organized structures in turbulent boundary layer with free-stream turbulence</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Environmental Pollution

ISSN

0269-7491

e-ISSN

—

Volume of the periodical

227

Issue of the periodical within the volume

August

Country of publishing house

GB - UNITED KINGDOM

Number of pages

14

Pages from-to

125-138

UT code for WoS article

000403991600015

EID of the result in the Scopus database

2-s2.0-85018292201