Regional Roughness Parameters and Momentum Fluxes over a Complex Area
- 1 December 1996
- journal article
- Published by American Meteorological Society in Journal of Applied Meteorology and Climatology
- Vol. 35 (12) , 2179-2190
- https://doi.org/10.1175/1520-0450(1996)035<2179:rrpamf>2.0.co;2
Abstract
Regional surface parameters of the roughness length z0 and the displacement height d0 needed to estimate the surface fluxes of a complex region were determined by applying a profile equation to 121 reliable wind profiles measured from instruments on a 213-m tower under unstable atmospheric conditions. The derived values of z0 over the experimental area were 0.98 ± 0.08 and 1.04 ± 0.05 m for two upwind areas, while those of d0 were 6.3 ± 3.1 and 6.7 ± 2.6 m for the same areas. These values of z0 and d0 were used to calibrate the drag coefficient D of major roughness obstacles in the models of Grant and Mason and of Raupach to predict roughness parameters as a function of surface features, such as the roughness density and the mean height of major obstacles. The calibrated value of D for the experimental area was found to be on the larger side among the values determined from past experiments. The calibrated models, together with some simple expressions, were then applied to different parts of the ... Abstract Regional surface parameters of the roughness length z0 and the displacement height d0 needed to estimate the surface fluxes of a complex region were determined by applying a profile equation to 121 reliable wind profiles measured from instruments on a 213-m tower under unstable atmospheric conditions. The derived values of z0 over the experimental area were 0.98 ± 0.08 and 1.04 ± 0.05 m for two upwind areas, while those of d0 were 6.3 ± 3.1 and 6.7 ± 2.6 m for the same areas. These values of z0 and d0 were used to calibrate the drag coefficient D of major roughness obstacles in the models of Grant and Mason and of Raupach to predict roughness parameters as a function of surface features, such as the roughness density and the mean height of major obstacles. The calibrated value of D for the experimental area was found to be on the larger side among the values determined from past experiments. The calibrated models, together with some simple expressions, were then applied to different parts of the ...Keywords
This publication has 0 references indexed in Scilit: