IMPROVEMENT OF ROUGHNESS LENGTH MODELLING FOR DENSELY PACKED HIGHRISE BUILDING AREAS

Abstract

 This study improves the urban roughness length modelling especially targeting densely-packed highrise building areas. An effective ground level was conceptually designed, considering that anything below this level has neglectable influence on the mean wind statistics within the logarithmic region. This effective ground level is modelled based on a function generated from the available parameters of building geometry, parameters taken from urban turbulence datasets produced from large eddy simulations. The urban geometrical parameters were updated as substitutional inputs for the conventional urban roughness models. The results of the model output of a conventional urban roughness model with the updated input parameters can improve the estimation of the roughness length of densely packed highrise building areas.