Abstract
We numerically examined surface-wind characteristics in Boso peninsula with T1915, especially paying attention to the interaction between the activation of strong winds near the maximum wind velocity radius of typhoon and the locally wind enhancement due to complex terrains. Time-series of surface winds obtained by a numerical weather prediction and a typhoon models showed that there existed strong wind area just outside the core of typhoon along the west coast in Boso peninsula; the wind speed and direction in the upper atmospheric boundary layer were about 60 m/s and south, respectively. The trajectory analysis on spatial distributions of time-averaged wind fields obtained by a wind-engineering model (CFD model) with a RANS model for the west coast in Boso peninsula indicated that the strong wind spots over the complex terrain were generated by an upslope and also upward undulations. Large-eddy-simulations for the strong wind spots gave the large turbulence intensities and peak factors compared with those observed above flat terrains.
