Nocturnal wind direction shear and its potential impact on pollutant transport

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The estimation of transport and diffusion of airborne pollutants during the nighttime is challenging, especially over complex terrain where gravity driven drainage flows may be overlain with wind from a different direction. This study investigates the character of wind direction shear in the lowest 100 m using tower measurements from a complex, semi-arid site where local thermally-driven flows are common. The effects of wind direction shear on plume transport are studied by simulating a hypothetical elevated term release. This is accomplished by first simulating transport and dispersion using wind measurements from only the 12-m level from a network of towers. … continued below

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18 p.

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Bowen, B.M.; Baars, J.A. & Stone, G.L. December 31, 1998.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 24 times. More information about this article can be viewed below.

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The estimation of transport and diffusion of airborne pollutants during the nighttime is challenging, especially over complex terrain where gravity driven drainage flows may be overlain with wind from a different direction. This study investigates the character of wind direction shear in the lowest 100 m using tower measurements from a complex, semi-arid site where local thermally-driven flows are common. The effects of wind direction shear on plume transport are studied by simulating a hypothetical elevated term release. This is accomplished by first simulating transport and dispersion using wind measurements from only the 12-m level from a network of towers. This case represents the approach commonly taken at many facilities where a network of short towers is available. Then the release is modeled using wind measurements made at four levels in the lowest 100 m. The differences between the two simulations are significant and would lead to very different responses in an emergency situation.

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18 p.

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OSTI as DE98001604

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  • 10. joint conference on the applications of air pollution meteorology, Phoenix, AZ (United States), 11-16 Jan 1998

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  • Other: DE98001604
  • Report No.: LA-UR--97-3746
  • Report No.: CONF-980116--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 564115
  • Archival Resource Key: ark:/67531/metadc695565

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 1:35 p.m.

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Bowen, B.M.; Baars, J.A. & Stone, G.L. Nocturnal wind direction shear and its potential impact on pollutant transport, article, December 31, 1998; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc695565/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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