Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations
Increasingly, Chinese cities are proposing city-scale ventilation corridors (VCs) to strengthen wind velocities and decrease pollution concentrations, although their influences are ambiguous. To assess VC impacts, an effort has been made to predict the impact of VC solutions in the high density and...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-09-01
|
| Series: | Atmosphere |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4433/12/10/1269 |
| _version_ | 1797515329855815680 |
|---|---|
| author | Chao Liu Qian Shu Sen Huang Jingwei Guo |
| author_facet | Chao Liu Qian Shu Sen Huang Jingwei Guo |
| author_sort | Chao Liu |
| collection | DOAJ |
| description | Increasingly, Chinese cities are proposing city-scale ventilation corridors (VCs) to strengthen wind velocities and decrease pollution concentrations, although their influences are ambiguous. To assess VC impacts, an effort has been made to predict the impact of VC solutions in the high density and diverse land use of the coastal city of Shanghai, China, in this paper. One base scenario and three VC scenarios, with various VC widths, locations, and densities, were first created. Then, the combination of the Weather Research and Forecasting/Single-Layer Urban Canopy Model (WRFv.3.4/UCM) and Community Multiscale Air Quality (CMAQv.5.0.1) numerical simulation models were employed to comprehensively evaluate the impacts of urban spatial form and VC plans on PM2.5 concentrations. The modeling results indicated that concentrations increased within the VCs in both summer and winter, and the upwind concentration decreased in winter. These counter-intuitive results could be explained by decreased planetary boundary layer (PBL), roughness height, deposition rate, and wind speeds induced by land use and urban height modifications. PM2.5 deposition flux decreased by 15–20% in the VCs, which was attributed to the roughness height decrease for it weakens aerodynamic resistance (Ra). PBL heights within the VCs decreased 15–100 m, and the entire Shanghai’s PBL heights also decreased in general. The modeling results suggest that VCs may not be as functional as certain urban planners have presumed. |
| first_indexed | 2024-03-10T06:43:58Z |
| format | Article |
| id | doaj.art-03d48bdb865f43b5b3cfd24e8ae6f48c |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T06:43:58Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-03d48bdb865f43b5b3cfd24e8ae6f48c2023-11-22T17:24:54ZengMDPI AGAtmosphere2073-44332021-09-011210126910.3390/atmos12101269Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 ConcentrationsChao Liu0Qian Shu1Sen Huang2Jingwei Guo3College of Urban and Regional Planning, Tongji University, Shanghai 200092, ChinaOak Ridge Institute for Science and Education (ORISE), US Environmental Protection Agency, Research Triangle Park, NC 27711, USADepartment of Civil Engineering, University of Miami, Coral Gables, FL 33146, USACollege of Urban and Regional Planning, Tongji University, Shanghai 200092, ChinaIncreasingly, Chinese cities are proposing city-scale ventilation corridors (VCs) to strengthen wind velocities and decrease pollution concentrations, although their influences are ambiguous. To assess VC impacts, an effort has been made to predict the impact of VC solutions in the high density and diverse land use of the coastal city of Shanghai, China, in this paper. One base scenario and three VC scenarios, with various VC widths, locations, and densities, were first created. Then, the combination of the Weather Research and Forecasting/Single-Layer Urban Canopy Model (WRFv.3.4/UCM) and Community Multiscale Air Quality (CMAQv.5.0.1) numerical simulation models were employed to comprehensively evaluate the impacts of urban spatial form and VC plans on PM2.5 concentrations. The modeling results indicated that concentrations increased within the VCs in both summer and winter, and the upwind concentration decreased in winter. These counter-intuitive results could be explained by decreased planetary boundary layer (PBL), roughness height, deposition rate, and wind speeds induced by land use and urban height modifications. PM2.5 deposition flux decreased by 15–20% in the VCs, which was attributed to the roughness height decrease for it weakens aerodynamic resistance (Ra). PBL heights within the VCs decreased 15–100 m, and the entire Shanghai’s PBL heights also decreased in general. The modeling results suggest that VCs may not be as functional as certain urban planners have presumed.https://www.mdpi.com/2073-4433/12/10/1269fine particulatewind corridorpollution exposureurban planUCMCMAQ |
| spellingShingle | Chao Liu Qian Shu Sen Huang Jingwei Guo Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations Atmosphere fine particulate wind corridor pollution exposure urban plan UCM CMAQ |
| title | Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations |
| title_full | Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations |
| title_fullStr | Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations |
| title_full_unstemmed | Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations |
| title_short | Modeling the Impacts of City-Scale “Ventilation Corridor” Plans on Human Exposure to Intra-Urban PM2.5 Concentrations |
| title_sort | modeling the impacts of city scale ventilation corridor plans on human exposure to intra urban pm2 5 concentrations |
| topic | fine particulate wind corridor pollution exposure urban plan UCM CMAQ |
| url | https://www.mdpi.com/2073-4433/12/10/1269 |
| work_keys_str_mv | AT chaoliu modelingtheimpactsofcityscaleventilationcorridorplansonhumanexposuretointraurbanpm25concentrations AT qianshu modelingtheimpactsofcityscaleventilationcorridorplansonhumanexposuretointraurbanpm25concentrations AT senhuang modelingtheimpactsofcityscaleventilationcorridorplansonhumanexposuretointraurbanpm25concentrations AT jingweiguo modelingtheimpactsofcityscaleventilationcorridorplansonhumanexposuretointraurbanpm25concentrations |