Near-ground cooling efficacies of trees and high-albedo surfaces

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Daytime summer urban heat islands arise when the prevalence of dark-colored surfaces and lack of vegetation make a city warmer than neighboring countryside. Two frequently-proposed summer heat island mitigation measures are to plant trees and to increase the albedo (solar reflectivity) of ground surfaces. This dissertation examines the effects of these measures on the surface temperature of an object near the ground, and on solar heating of air near the ground. Near-ground objects include people, vehicles, and buildings. The variation of the surface temperature of a near-ground object with ground albedo indicates that a rise in ground albedo will cool ... continued below

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166 p.

Creation Information

Levinson, R.M. May 1, 1997.

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  • Levinson, R.M. Univ. of California, Berkeley, CA (United States). Dept. of Mechanical Engineering

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Description

Daytime summer urban heat islands arise when the prevalence of dark-colored surfaces and lack of vegetation make a city warmer than neighboring countryside. Two frequently-proposed summer heat island mitigation measures are to plant trees and to increase the albedo (solar reflectivity) of ground surfaces. This dissertation examines the effects of these measures on the surface temperature of an object near the ground, and on solar heating of air near the ground. Near-ground objects include people, vehicles, and buildings. The variation of the surface temperature of a near-ground object with ground albedo indicates that a rise in ground albedo will cool a near-ground object only if the object`s albedo exceeds a critical value. This critical value of object albedo depends on wind speed, object geometry, and the height of the atmospheric thermal boundary layer. It ranges from 0.15 to 0.37 for a person. If an object has typical albedo of 0.3, increasing the ground albedo by.

Physical Description

166 p.

Notes

OSTI as DE97007924

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  • Other Information: TH: Thesis (Ph.D.)

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  • Other: DE97007924
  • Report No.: LBNL--40334
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 505747
  • Archival Resource Key: ark:/67531/metadc692583

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 5, 2016, 10:22 a.m.

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Levinson, R.M. Near-ground cooling efficacies of trees and high-albedo surfaces, thesis or dissertation, May 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc692583/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.