Boundary-Layer Meteorology

, Volume 37, Issue 3, pp 271-284

First online:

Roughness effects on urban turbulence parameters

  • Metin YerselAffiliated withDepartment of Natural Sciences, Lyndon State College
  • , Robert GobleAffiliated withDepartment of Physics and Center for Environment, Technology and Society, Clark University

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Urban roughness lengths are estimated from measurements of u and u * at one level under neutral conditions, assuming a logarithmic form for the vertical profile of wind velocity. At a given location in the urban area, estimated values show considerable directional variation. The dependence of some turbulence parameters on the urban roughness lengths is experimentally investigated during near-neutral conditions. The ratios Σ i /u * decrease with roughness whereas the turbulence intensities Σ i /u increase with it. The dependence on roughness is not the same for all components.