Guidelines for airflow over complex terrain: model developments

The “Guidelines” for estimating wind speed variations in boundary–layer flow over hills and other terrain features as well as within internal boundary layers downstream of changes in surface roughness were developed by Taylor and Lee and Walmsley, Taylor and Salmon. We revisit the problem and propose new formulations based on results of our MSFD and NLMSFD calculations of flow over hills. The effects of surface roughness and non-linearity on fractional speed-up are incorporated. Comparisons with experimental data are discussed.