Field Measurement of Near-Ground Wind Characteristics of Supper Typhoon Mangkhut

Abstract:

Based on the wind speed records from the 356m high Shenzhen Meteorological Gradient Tower（SZMGT）， this paper analyzes the vertical distribution of wind characteristics during the invasion of the super typhoon Mangkut. The results show that： the mean wind speed profile exponent of the upstream surface of the SZGMT is 0.238， which is slightly higher than that of the Load Code for the Design of Building Structures （GB50009-2012） for terrain category C. The longitudinal turbulence intensity distribution is close to the recommended value of GB50009-2012 for terrain category D. The three-direction turbulence intensity ratio is smaller than the recommended value of Highway Bridge Wind Resistance Design Guide， and increases with the increase of height. The gust factor is highly linear with the turbulence intensity， and the fitting result of the peak factor is close to 2.5. The observed longitudinal turbulence integral scale profile is slightly larger than the recommended value of AIJ 2004 and ASCE7-2010， and the longitudinal wind speed spectra are consistent with Von Karman spectrum.

Key words:wind characteristics;wind profile;underlying surface;typhoon observation