Boundary-Layer Meteorology

, Volume 74, Issue 3, pp 289–312 | Cite as

Turbulence characteristics and organized motion in a suburban roughness sublayer

  • Susumu Oikawa
  • Yan Meng


To investigate tubulence characteristics and organized motion within and above an urban canopy, field observations were conducted in July 1991 and November 1992 in Sapporo, Japan. The measurement heights were 5.4, 10.3, 18, 35 and 45 m above ground; the canopy height was 7 m. The profiles of σu peaked slightly above the canopy, while σv and σw had nearly uniform profiles. Vertical profiles of Reynolds stress -\(\overline {u'w'} \) peaked slightly at 1.5 times the canopy height and decreased slowly with height thereafter. A four-quadrant analysis showed that sweep and ejection motions caused high-velocity fluid from above moves downward toward the surface and low-velocity fluid from below moves upward. An ensemble-averaging technique was used to isolate typical features of the flow and temperature fields. A time-height cross-section of velocity vectors and temperature contours showed details of the flow structures associated with temperature ramps. It has been noted that the organized motions play important roles in the transport of heat near the urban canopy, where the sweep motion causes negative temperature fluctuations and the ejection motion causes positive temperature fluctuations.


Flow Structure Vertical Profile Temperature Fluctuation Reynolds Stress Measurement Height 
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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Susumu Oikawa
    • 1
  • Yan Meng
    • 1
  1. 1.Environmental Engineering Department, Institute of TechnologySHIMIZU CORPORATIONTokyoJapan

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