Effective transport velocity and plume elongation in nocturnal valley wind fields

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Using three atmospheric tracers the effective transport velocity and plume elongation produced by nocturnal drainage wind in three different valleys were investigated. Tracer was released in each valley in a well defined drainage wind field and sequentially sampled at downvalley locations. The effective transport velocity (V-eff) was determined from the elapsed time from the start of the release to the time when the plume concentration reached 10% of its peak value and the distance from the release site. The plume elongation factor was determined from the ratio of the width (time) of the plume at 10% of its peak value ... continued below

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Pages: 7

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Clements, W.E.; Barr, S. & Fowler, M.M. January 1, 1980.

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Description

Using three atmospheric tracers the effective transport velocity and plume elongation produced by nocturnal drainage wind in three different valleys were investigated. Tracer was released in each valley in a well defined drainage wind field and sequentially sampled at downvalley locations. The effective transport velocity (V-eff) was determined from the elapsed time from the start of the release to the time when the plume concentration reached 10% of its peak value and the distance from the release site. The plume elongation factor was determined from the ratio of the width (time) of the plume at 10% of its peak value to the duration of the release. This method was chosen as an objective analysis scheme. Mean measured winds (V) were computed from surface wind instruments along the drainage flow path with values weighted by the estimated time the plume was in the wind field best represented by a measurement. The values used were from the start of release to the time of arrival at the sampler in question. V is compred to V-eff to see how reasonable an estimate of plume transport in valleys can be made from a few surface measurements in the valley. The simple tracer technique used in the studies has proven to be a good one in accomplishing the stated objective of investigating effective transport velocity and plume elongation in nocturnal valley drainage winds.

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Pages: 7

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NTIS, PC A02/MF A01.

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  • 2. joint conference on applications of air pollution meteorology, New Orleans, LA, USA, 24 Mar 1980

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  • Report No.: LA-UR-80-791
  • Report No.: CONF-800327-8
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5293680
  • Archival Resource Key: ark:/67531/metadc1068737

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  • January 1, 1980

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 30, 2018, 3:31 p.m.

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Clements, W.E.; Barr, S. & Fowler, M.M. Effective transport velocity and plume elongation in nocturnal valley wind fields, article, January 1, 1980; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1068737/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.