기상청 주변의 지형 및 지표면 조도를 고려한 기본풍속 산정 방안 연구

Recently, as the wind induced damages are on the increase, design wind speed was applied design of structure. Also, in order to estimate the design wind speed , the yearly maximum wind speed provided by the Korea Meteorological Agency is used. However, it provides the highest of the observed wind speeds increase or decrease by terrain effect or surface roughness. For these reasons, when performing extreme analysis using observation wind speed, the effect of the surface roughness and terrain be corrected for use. The maximum yearly wind speed was the maximum of the wind speed before correction and the maximum of the corrected wind speed should be used to ensure statistical significance. Therefore, in this study, the daily maximum wind speeds of 60 weather observation stations across the country with more than 40 years of observation data were corrected to basic wind speed conditions according to the topography and surface roughness. Besides, the maximum annual wind speed of the corrected maximum wind speed was selected, and the wind speed of the reproduction period was calculated through frequency analysis. Plus, the annual maximum wind speed was selected using the daily maximum wind speed before correction, and the selected annual maximum wind speed was corrected to compare with the calculated wind speed. As a result, the maximum difference of 4.2m/s was observed on the basis of the centurial reconstruction period wind speed, and the average difference was about 0.33m/s.