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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9 p.

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Bowen, B.M.; Baars, J.A. & Stone, G.L. September 1, 1997.

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Description

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.

Physical Description

9 p.

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OSTI as DE98053713

Other: FDE: PDF; PL:

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  • 78. American Meteorological Society annual meeting, Phoenix, AZ (United States), 11-16 Jan 1998

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  • Other: DE98053713
  • Report No.: UCRL-JC--127328
  • Report No.: CONF-980121--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 651557
  • Archival Resource Key: ark:/67531/metadc706534

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  • September 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 6:20 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, September 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc706534/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.