Abstract
Abstract To improve the accuracy of estimation of local strong wind, new local topographic parameters were introduced in the multiple regression analysis. New azimuthal topographic factors were defined independently of particular radius of fan-shaped area for the estimation of usual topographic factors. In addition to them, some micro-scale local terrain factors were defined from scenery pictures of 16-azimuths around the site. The azimuthal strong wind velocity at a construction site was evaluated through the two-step estimation, in which the representative wind speed at a site was estimated by first regression analysis with the usual topographic factors and second regression analysis with newly defined micro-scale factors was followed to estimate the azimuthal wind speed fluctuation. It was shown that the new topographic factors defined here played an important role in all regression analyses.
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