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The impact of screening on road surface temperature

Published online by Cambridge University Press:  21 November 2000

J Bogren ,
T Gustavsson ,
M Karlsson  and
U Postgård
J Bogren
Affiliation:
Earth Sciences Centre, Physical Geography, Göteborg University, Box 460, SE 405 30 Göteborg, Sweden
T Gustavsson
Affiliation:
Earth Sciences Centre, Physical Geography, Göteborg University, Box 460, SE 405 30 Göteborg, Sweden
M Karlsson
Affiliation:
Earth Sciences Centre, Physical Geography, Göteborg University, Box 460, SE 405 30 Göteborg, Sweden
U Postgård
Affiliation:
Earth Sciences Centre, Physical Geography, Göteborg University, Box 460, SE 405 30 Göteborg, Sweden
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Abstract

The effect of screening on road surface temperatures is analysed using data from the Swedish road weather information system (RWIS) together with data from thermal mapping. The study deals with the analysis of temperature variations caused by shading of the road surface during clear daytime conditions and focuses on the relation between solar elevation and magnitude of road surface temperature differences between screened and sun-exposed areas. Also included is an analysis of how the temperature differences during the day affect the establishment of temperature variations after sunset and the time it takes after sunset for temperature differences caused by shading to decline. The results show that the magnitude of road surface temperature differences between sun exposed and screened sites (RSTdiff) that develop during clear day conditions can be attributed to solar elevation (β) and can be expressed by the equation: RSTdiff=−2.7+0.46(β). A relationship between the daily maximum temperature difference andthe preservation of the screening effect after sunset is observed. The effect after sunset can be described by: RSTdiff=A−Bh+Ch2−Dh3−Eh4+Fh5, where h is the time in hours after sunset and A to F are constants related to the time of the year at the actual site.

Type
Research Article
Information
Meteorological Applications , Volume 7 , Issue 2 , June 2000 , pp. 97 - 104
Copyright
© 2000 Cambridge University Press

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