Počet záznamů: 1
Street-canyon pollution with respect to urban-array complexity: The role of lateral and mean pollution fluxes
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SYSNO ASEP 0489573 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Street-canyon pollution with respect to urban-array complexity: The role of lateral and mean pollution fluxes Tvůrce(i) Nosek, Štěpán (UT-L) RID, ORCID
Fuka, V. (CZ)
Kukačka, Libor (UT-L) RID
Kluková, Zuzana (UT-L) ORCID
Jaňour, Zbyněk (UT-L) RID, ORCIDZdroj.dok. Building and Environment. - : Elsevier - ISSN 0360-1323
Roč. 138, June (2018), s. 221-234Poč.str. 14 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova urban air quality ; street canyon ; computational modelling ; large-eddy simulation ; pollution flux ; wind-tunnel experiment Vědní obor RIV DG - Vědy o atmosféře, meteorologie Obor OECD Meteorology and atmospheric sciences Institucionální podpora UT-L - RVO:61388998 UT WOS 000436887200019 EID SCOPUS 84957027027 DOI 10.1016/j.buildenv.2018.04.036 Anotace The prediction of pollution within street canyons remains challenging due to the complexity of turbulent flows in urban environments. To improve our understanding of these flows and their relation to the ventilation of street-canyons, we studied pollution fluxes through all street-canyon openings and their balance with respect to urban-array complexity using large-eddy simulations (LES). We validated the LES with wind-tunnel measurements using mean velocities and concentrations and the mean total and turbulent pollution fluxes at the top and lateral openings of the street canyons with either uniform or nonuniform heights and pitched roofs. The LES confirm and extend recent findings about the importance of mean horizontal pollution fluxes for pollutant transport within a street network. The mean fluxes have at least the same dominance as the turbulent ones in case of lateral openings. In case of top openings, the mean fluxes clearly dominate if openings at the roof eaves are selected. While pollutant removal and entrainment through lateral openings are negligible in case of uniform canyons, they are notable in case of nonuniform canyons. We demonstrate that urban roof height nonuniformity does not necessarily enhance the street-canyon ventilation because it worsens (by a factor of 1.1) or improves (by a factor of 1.5) the ventilation compared with the urban uniform height. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2019 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0360132318302452
Počet záznamů: 1