Fog Formation Related to Gravity Currents Interacting with Coastal Topography
An interesting mixing-fog event was identified during IOP7 of the C-FOG project, where a cold front arriving from the north-east collided with the Downs peninsula in Ferryland, Newfoundland, to produce foggy conditions. A comprehensive set of field observations suggests that this collision caused tu...
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ftosti:oai:osti.gov:1837664 2023-07-30T04:05:03+02:00 Fog Formation Related to Gravity Currents Interacting with Coastal Topography Bardoel, Stef L. Horna Muñoz, Daniel V. Grachev, Andrey A. Krishnamurthy, Raghavendra Chamorro, Leonardo P. Fernando, Harindra S. 2022-07-11 application/pdf http://www.osti.gov/servlets/purl/1837664 https://www.osti.gov/biblio/1837664 https://doi.org/10.1007/s10546-021-00638-w unknown http://www.osti.gov/servlets/purl/1837664 https://www.osti.gov/biblio/1837664 https://doi.org/10.1007/s10546-021-00638-w doi:10.1007/s10546-021-00638-w 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1007/s10546-021-00638-w 2023-07-11T10:09:14Z An interesting mixing-fog event was identified during IOP7 of the C-FOG project, where a cold front arriving from the north-east collided with the Downs peninsula in Ferryland, Newfoundland, to produce foggy conditions. A comprehensive set of field observations suggests that this collision caused turbulent mixing of nearly saturated ambient air with an almost saturated cold front, creating conditions for mixing fog. Additionally, laboratory experiments were performed to study the interaction of lock-exchange induced gravity currents with a (rectangular) obstacle to delve into physical processes underlying this phenomenon. Instantaneous velocity and density fields were obtained using particle image velocimetry and planar laser-induced fluorescence. The observations suggest that the obstacle starts affecting the approaching gravity-current propagation at an upstream distance of 2 H and, upon collision, the mixing is taking place over a spatial scale of 0.83 H , where H is the depth of the ambient fluid layer. The time for largerscale turbulent stirring to permeate to the smallest scales of turbulence and activate the condensation nuclei was estimated as 3t * , where t* = √H/g' is the intrinsic time scale of the gravity current and g' the reduced gravity. Extrapolation of results to IOP7 showed a good agreement with observations. Other/Unknown Material Newfoundland SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Boundary-Layer Meteorology 181 2-3 499 521 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Bardoel, Stef L. Horna Muñoz, Daniel V. Grachev, Andrey A. Krishnamurthy, Raghavendra Chamorro, Leonardo P. Fernando, Harindra S. Fog Formation Related to Gravity Currents Interacting with Coastal Topography |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
An interesting mixing-fog event was identified during IOP7 of the C-FOG project, where a cold front arriving from the north-east collided with the Downs peninsula in Ferryland, Newfoundland, to produce foggy conditions. A comprehensive set of field observations suggests that this collision caused turbulent mixing of nearly saturated ambient air with an almost saturated cold front, creating conditions for mixing fog. Additionally, laboratory experiments were performed to study the interaction of lock-exchange induced gravity currents with a (rectangular) obstacle to delve into physical processes underlying this phenomenon. Instantaneous velocity and density fields were obtained using particle image velocimetry and planar laser-induced fluorescence. The observations suggest that the obstacle starts affecting the approaching gravity-current propagation at an upstream distance of 2 H and, upon collision, the mixing is taking place over a spatial scale of 0.83 H , where H is the depth of the ambient fluid layer. The time for largerscale turbulent stirring to permeate to the smallest scales of turbulence and activate the condensation nuclei was estimated as 3t * , where t* = √H/g' is the intrinsic time scale of the gravity current and g' the reduced gravity. Extrapolation of results to IOP7 showed a good agreement with observations. |
author |
Bardoel, Stef L. Horna Muñoz, Daniel V. Grachev, Andrey A. Krishnamurthy, Raghavendra Chamorro, Leonardo P. Fernando, Harindra S. |
author_facet |
Bardoel, Stef L. Horna Muñoz, Daniel V. Grachev, Andrey A. Krishnamurthy, Raghavendra Chamorro, Leonardo P. Fernando, Harindra S. |
author_sort |
Bardoel, Stef L. |
title |
Fog Formation Related to Gravity Currents Interacting with Coastal Topography |
title_short |
Fog Formation Related to Gravity Currents Interacting with Coastal Topography |
title_full |
Fog Formation Related to Gravity Currents Interacting with Coastal Topography |
title_fullStr |
Fog Formation Related to Gravity Currents Interacting with Coastal Topography |
title_full_unstemmed |
Fog Formation Related to Gravity Currents Interacting with Coastal Topography |
title_sort |
fog formation related to gravity currents interacting with coastal topography |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1837664 https://www.osti.gov/biblio/1837664 https://doi.org/10.1007/s10546-021-00638-w |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
http://www.osti.gov/servlets/purl/1837664 https://www.osti.gov/biblio/1837664 https://doi.org/10.1007/s10546-021-00638-w doi:10.1007/s10546-021-00638-w |
op_doi |
https://doi.org/10.1007/s10546-021-00638-w |
container_title |
Boundary-Layer Meteorology |
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181 |
container_issue |
2-3 |
container_start_page |
499 |
op_container_end_page |
521 |
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1772816747441684480 |