Abstract:

Based on the observation data of 10-minute wind at 9 national weather stations and 165 regional weather stations in the Dalian region of Liaoning province from May 2015 to April 2020, the maximum, mean, and minimum gust coefficients in the Dalian region were statistically analyzed in terms of wind direction, wind level, monthly variation, daily variation, spatial variation and weather influence system.The results show that the variation of the mean gust coefficients from January to December ranges from 1.66 to 1.77.The average gust coefficient of the wind direction corresponding to the cold air is larger than that corresponding to the warm air.The mean gust coefficient of the wind directions corresponding to cold air is greater than the wind directions corresponding to warm air.With the increase in wind level, the maximum and minimum gust coefficients converge to the average gust coefficient.The frequency distribution of the gust coefficient at different wind levels is unimodal, and the larger the wind level appears, the narrower the distribution ranges.Except for the southwesterly wind, the gust coefficients of other wind directions are high during the day and low at night.The gust coefficient in Dalian has obvious regional characteristics.The wind gust coefficient in the southeast and northwest coastal areas is smaller than that in inland and southwest coastal areas, and the wind direction does not affect the spatial distribution of the wind gust coefficient.The winding process in Dalian is mainly affected by the dual systems of a maritime cyclone and front high pressure, thus the average gust coefficient of a cyclone, typhoon, and thunderstorm gale is larger than the average of the same wind level.

Key words: Gust, Gust coefficient, 10 min average wind, Peninsular region