An analytical-empirical method for determining the roughness length and zero-plane displacement

✍ Scribed by Aloysius K. Lo

• Publisher: Springer
• Year: 1977
• Tongue: English
• Weight: 515 KB
• Volume: 12
• Category: Article
• ISSN: 0006-8314
• DOI: 10.1007/bf00121969

✦ Synopsis

A method based on the principle of the Method of Weighted Residuals for evaluating the roughness-length (zn) and zero-plane displacement (d) is presented. This method not only can minimize errors involved during the calculation process but can also smooth and re-distribute the already minimized error in a most favourable manner via using appropriate weighting functions. With the inclusion of d in addition to zc, formulae for wind and temperature profiles'in the surface layer are presented by: and where $ and (LT are the 'integrated diabetic influence functions' for velocity and temperature profiles respectively.

Analytical expressions for both $ and JIT as functions of wind shear or, implicitly in terms of the Richardson number have been derived.