Aerodynamic roughness variation with vegetation: analysis in a suburban neighbourhood and a city park

Christoph W. Kent, Keunmin Lee, Helen C. Ward, Je Woo Hong, Jinkyu Hong, David Gatey, Sue Grimmond

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Local aerodynamic roughness parameters (zero-plane displacement, zd, and aerodynamic roughness length, z0) are determined for an urban park and a suburban neighbourhood with a new morphometric parameterisation that includes vegetation. Inter-seasonal analysis at the urban park demonstrates zd determined with two anemometric methods is responsive to vegetation state and is 1–4 m greater during leaf-on periods. The seasonal change and directional variability in the magnitude of zd is reproduced by the morphometric methods, which also indicate z0 can be more than halved during leaf-on periods. In the suburban neighbourhood during leaf-on, the anemometric and morphometric methods have similar directional variability for both zd and z0. Wind speeds at approximately 3 times the average roughness-element height are estimated most accurately when using a morphometric method which considers roughness-element height variability. Inclusion of vegetation in the morphometric parameterisation improves wind-speed estimation in all cases. Results indicate that the influence of both vegetation and roughness-element height variability are important for accurate determination of local aerodynamic parameters and the associated wind-speed estimates.

Original languageEnglish
Pages (from-to)227-243
Number of pages17
JournalUrban Ecosystems
Volume21
Issue number2
DOIs
Publication statusPublished - 2018 Apr 1

All Science Journal Classification (ASJC) codes

  • Ecology
  • Urban Studies

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