English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. A multi-model simulation system for street-levelcirculation and pollutant tracking (S-TRACK) has been developed byintegrating the Weather Research and Forecasting (WRF), the STAR-CCM+(computational fluid dynamics model – CFD), and the Flexible Particle(FLEXPART) models. The winter wind environmental characteristics and thepotential contribution of traffic sources to nearby receptor sites in a citydistrict of China are analysed with the system for January 2019. It is foundthat complex building layouts change the structure of the wind field andthus have an impact on the transport of pollutants. The wind speed insidethe building block is lower than the background wind speed due to thedragging effect of dense buildings. Ventilation is better when the dominantairflow is in the same direction as the building layout. Influenced by thebuilding layout, the local circulations show that the windward side of thebuilding is mostly the divergence zone, and the leeward side is mostly theconvergence zone, which is more obvious for high buildings. With thehypothesis that the traffic sources are uniformly distributed on each roadand with identical traffic intensity, the potential contribution ratios(PCRs) of four traffic sources to certain specific sites under the influenceof the street-level circulations are estimated with the method of residencetime analysis. It is found that the contribution ratio varies with theheight of the receptor site. As a result of the generally upward motion inthe airflow, the position with the greatest PCR from the four road trafficsources is located at a certain height which is commonly influenced by thedistance of this location from the traffic source and the background windfield (about 15 m in this study). The potential contribution of a road toone of the receptor sites is also investigated under different winddirections. The established system and the results can be used to understandthe characteristics of urban wind environment and to help the air pollutioncontrol planning in urban areas.

Development and application of a street-level meteorology and pollutant tracking system (S-TRACK)