Theoretical and Applied Climatology

, Volume 91, Issue 1–4, pp 245–258 | Cite as

Numerical estimation of the effective albedo of an urban canyon

  • K. Fortuniak


The paper focuses on the absorption of shortwave radiation in an urban street canyon. To test the effective albedo of the canyon an analytic solution of the multiple reflection problem is applied. The infinitesimally long canyon is divided into slices and a matrix of view factors for the slices is defined. Incoming shortwave radiation includes direct and diffuse parts and shadowing effects are included in the analysis. The model is validated against Aida’s (1982) scale model data and measurements in a real canyon. The results demonstrate a rapid decrease of the effective albedo as the canyon aspect ratio (its height to width, H/W) are increased. It is also shown that diurnal changes of the effective albedo can be very complex depending on the particular combination of H/W ratio, surface reflectivity and canyon orientation.


Surface Albedo Street Canyon Diffuse Radiation View Factor Direct Solar Radiation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • K. Fortuniak
    • 1
  1. 1.Department of Meteorology and ClimatologyUniversity of ŁódźŁódźPoland

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