Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy
Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Barbano, Francesco [verfasserIn] |
|---|
| Format: |
Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2020 |
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| Schlagwörter: |
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| Anmerkung: |
© The Author(s) 2020 |
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| Übergeordnetes Werk: |
Enthalten in: Boundary layer meteorology - Springer Netherlands, 1970, 178(2020), 1 vom: 08. Aug., Seite 119-142 |
|---|---|
| Übergeordnetes Werk: |
volume:178 ; year:2020 ; number:1 ; day:08 ; month:08 ; pages:119-142 |
| Links: |
|---|
| DOI / URN: |
10.1007/s10546-020-00554-5 |
|---|
| Katalog-ID: |
OLC2122858389 |
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| 520 | |a Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. | ||
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10.1007/s10546-020-00554-5 doi (DE-627)OLC2122858389 (DE-He213)s10546-020-00554-5-p DE-627 ger DE-627 rakwb eng 550 VZ 16,13 ssgn Barbano, Francesco verfasserin (orcid)0000-0002-4403-7070 aut Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2020 Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. City breathability Exchange processes Turbulent scales Urban canopy Brattich, Erika aut Di Sabatino, Silvana aut Enthalten in Boundary layer meteorology Springer Netherlands, 1970 178(2020), 1 vom: 08. Aug., Seite 119-142 (DE-627)129610410 (DE-600)242879-9 (DE-576)015105679 0006-8314 nnns volume:178 year:2020 number:1 day:08 month:08 pages:119-142 https://doi.org/10.1007/s10546-020-00554-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_22 GBV_ILN_381 GBV_ILN_601 AR 178 2020 1 08 08 119-142 |
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10.1007/s10546-020-00554-5 doi (DE-627)OLC2122858389 (DE-He213)s10546-020-00554-5-p DE-627 ger DE-627 rakwb eng 550 VZ 16,13 ssgn Barbano, Francesco verfasserin (orcid)0000-0002-4403-7070 aut Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2020 Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. City breathability Exchange processes Turbulent scales Urban canopy Brattich, Erika aut Di Sabatino, Silvana aut Enthalten in Boundary layer meteorology Springer Netherlands, 1970 178(2020), 1 vom: 08. Aug., Seite 119-142 (DE-627)129610410 (DE-600)242879-9 (DE-576)015105679 0006-8314 nnns volume:178 year:2020 number:1 day:08 month:08 pages:119-142 https://doi.org/10.1007/s10546-020-00554-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_22 GBV_ILN_381 GBV_ILN_601 AR 178 2020 1 08 08 119-142 |
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10.1007/s10546-020-00554-5 doi (DE-627)OLC2122858389 (DE-He213)s10546-020-00554-5-p DE-627 ger DE-627 rakwb eng 550 VZ 16,13 ssgn Barbano, Francesco verfasserin (orcid)0000-0002-4403-7070 aut Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2020 Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. City breathability Exchange processes Turbulent scales Urban canopy Brattich, Erika aut Di Sabatino, Silvana aut Enthalten in Boundary layer meteorology Springer Netherlands, 1970 178(2020), 1 vom: 08. Aug., Seite 119-142 (DE-627)129610410 (DE-600)242879-9 (DE-576)015105679 0006-8314 nnns volume:178 year:2020 number:1 day:08 month:08 pages:119-142 https://doi.org/10.1007/s10546-020-00554-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_22 GBV_ILN_381 GBV_ILN_601 AR 178 2020 1 08 08 119-142 |
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10.1007/s10546-020-00554-5 doi (DE-627)OLC2122858389 (DE-He213)s10546-020-00554-5-p DE-627 ger DE-627 rakwb eng 550 VZ 16,13 ssgn Barbano, Francesco verfasserin (orcid)0000-0002-4403-7070 aut Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2020 Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. City breathability Exchange processes Turbulent scales Urban canopy Brattich, Erika aut Di Sabatino, Silvana aut Enthalten in Boundary layer meteorology Springer Netherlands, 1970 178(2020), 1 vom: 08. Aug., Seite 119-142 (DE-627)129610410 (DE-600)242879-9 (DE-576)015105679 0006-8314 nnns volume:178 year:2020 number:1 day:08 month:08 pages:119-142 https://doi.org/10.1007/s10546-020-00554-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_22 GBV_ILN_381 GBV_ILN_601 AR 178 2020 1 08 08 119-142 |
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10.1007/s10546-020-00554-5 doi (DE-627)OLC2122858389 (DE-He213)s10546-020-00554-5-p DE-627 ger DE-627 rakwb eng 550 VZ 16,13 ssgn Barbano, Francesco verfasserin (orcid)0000-0002-4403-7070 aut Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy 2020 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s) 2020 Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. City breathability Exchange processes Turbulent scales Urban canopy Brattich, Erika aut Di Sabatino, Silvana aut Enthalten in Boundary layer meteorology Springer Netherlands, 1970 178(2020), 1 vom: 08. Aug., Seite 119-142 (DE-627)129610410 (DE-600)242879-9 (DE-576)015105679 0006-8314 nnns volume:178 year:2020 number:1 day:08 month:08 pages:119-142 https://doi.org/10.1007/s10546-020-00554-5 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_22 GBV_ILN_381 GBV_ILN_601 AR 178 2020 1 08 08 119-142 |
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Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy |
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Barbano, Francesco |
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Boundary layer meteorology |
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Boundary layer meteorology |
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eng |
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2020 |
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Barbano, Francesco Brattich, Erika Di Sabatino, Silvana |
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Barbano, Francesco |
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10.1007/s10546-020-00554-5 |
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550 |
| title_sort |
characteristic scales for turbulent exchange processes in a real urban canopy |
| title_auth |
Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy |
| abstract |
Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. © The Author(s) 2020 |
| abstractGer |
Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. © The Author(s) 2020 |
| abstract_unstemmed |
Abstract An experimental field campaign is designed to unveil mechanisms responsible for turbulent exchange processes when mechanical and thermal effects are entwined. The focus is an urban street canyon with a mean aspect ratio H/W of 1.65 in the business centre of a mid-size Italian city (H is the mean building height and W is the mean canyon width). The exchange processes can be characterized by time scales and time-scale ratios specific to either mechanical or thermal process. Time scales describe the mixing caused by momentum and heat exchange within different canyon layers, while their rates are surrogates of their efficacy. Given that homogeneous mixing does not always occur within the canyon, several time scales are estimated at different levels, showing that mechanical and thermal processes may both contribute to enhance mixing. By computing mechanical time scales, it is found that the fastest mixing occurs at the canyon rooftop level for perpendicular or oblique wind directions, while slow mixing occurs for parallel directions. Thermal processes are faster than the mechanical ones and are particularly efficient for perpendicular wind directions. By calculating the time-scale ratios, exchange processes are found to facilitate mixing for most wind directions and to regulate the pollutant-concentration variability in the canyon. This variability can be associated with the local-circulation regime, demarcated as thermally driven or inertially driven using a buoyancy parameter, i.e., the ratio between thermal and inertial forcings. Using this approach, a generalization of the results is proposed, enabling the extension of the current investigation to different street-canyon aspect ratios. © The Author(s) 2020 |
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Characteristic Scales for Turbulent Exchange Processes in a Real Urban Canopy |
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Brattich, Erika Di Sabatino, Silvana |
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