地域代表風速の推定法

概要

論文の詳細を見る
Method of estimating a representative wind speed over land surface was developed for 155 meteorological stations of the Japan Meteorological Agency. Two types of wind speed, U_A and U_B, were considered here. U_A is defined as the wind speed at 50m above ground for each meteorological station. Statistical analysis for 5 years showed that the observed wind speeds at the inland stations are 0.4 to 0.9 times of the theoretical values over flat surface, which are derived from Rossby number similarity theory. When averaged for the 106 stations (excluding the stations located in cape, mountain and small island), the observed wind speed is 0.67 times of the theoretical value. The factor 0.67 (≡α_<mean>) implies the topographical reducing factor averaged over Japan. The representative wind speed U_B is defined as α_<mean> U_<50>, where U_<50> is the theoretical 50m-height wind speed over flat surface (assuming the aerodynamic roughness z_o=1m). U_B does not include both the two effects of local topography and local ground condition, and is suitable for analysis of synoptic-scale wind field.
日本自然災害学会の論文
1992-01-31