The following information may be useful for your research

Abstact:Urban climate experimental results from the Comprehensive Outdoor Scale Model (COSMO) were used to estimate roughness lengths for momentum and heat. Two different physical scale models were used toinvestigate the scale dependence of the roughness lengths; the large scale model included an aligned arrayof 1.5-m concrete cubes, and the small scale model had a geometrically similar array of 0.15-m concretecubes. 

Ref: Roughness Lengths for Momentum and Heat Derived from Outdoor Urban

Scale Models

M. KANDA, M. KANEGA, T. KAWAI, AND R. MORIWAKI

American Meteorological Society, 2007

journals.ametsoc.org/doi/pdf/10.1175/JAM2500.1

Thank you sir. The article is very much appropriate.

Respected Sir  (Lech Lobocki)

Thank you for the reply.

Regards