Field measurement study on wind characteristics of strong windstorm in coastal terrain

Mean wind speed and wind turbulence characteristics of strong winds in surface boundary layer were studied by bootstrap method based on strong wind data sample in accordance with 10m height and mean wind speed higher than 10m/s. The strong wind data were recorded from 100m meteorological tower at sites near seashore with strong wind conditions and coastal terrain. The major objective of the paper is to further understand differences between near ground typhoon-generated and monsoon wind characteristics. Furthermore, the estimated wind profile and turbulence profiles were compared to those stipulated by wind loads Standard to verify the suitability of the wind load specification.The results reveal that in the near-surface range vertical distribution of mean wind speed can be well described by a logarithmic law and a power law. The mean values of exponent of the power-law profile are 0.12 and 0.06 for the coastal terrain in the typhoons and monsoon wind climates, respectively. The variation of the mean longitudinal turbulence intensity with varing height approximately follows a power law. The mean value of longitudinal turbulence intensity at five heights was fitting the results of the turbulence intensity profile. The profile is which was approximately same as that stipulated in wind loads Standard for coastal terrain exposure. Meanwhile, the measured gust factor of typhoons is larger than that stipulated in wind loads Standard for the coastal terrain exposure, but for the monsoon, it is close to the code value.