3-DIMENSIONAL RADIATION MODEL FOR URBAN CANOPY

Abstract

Numerical simulations of canopy albedo for 3 dimensional model cities are performed using the Simple Urban canopy Model for Meso-scale simulation (SUMM). The algorism of the SUMM is described in this study. Model parameters and analytical conditions appropriate for validation studies are examined, and then the simulation results are compared with the experimental data. The model results agree fairly well with experimental results, even though slight disagreements exist especially for low solar angles. Both the simulations and experiments demonstrate that urban geometries significantly influence canopy albedos.