【摘要】 利用铁塔风梯度观测资料和超声风温仪观测资料,对2008年1月18—21日暴雪前后,湖北黄石长江岸边近地层风场和湍流作了计算分析,探索其异常变化特征,为认识黄石地区暴雪近地层发生发展的物理过程提供依据。结果表明,暴雪前,风向转变,水平风速和垂直风速明显增大,湍流通量的输送较活跃,湍流动能和湍流强度有显著峰值出现;降雪过程结束后,湍流动能再次增大后缓慢减弱。可见此次暴雪过程前后近地层物理量场有异常变化。更多还原

【Abstract】 Base on the observational data obtained from tower in Huangshi area along the Yangtze River,a detailed study on an ice storm process on 18—21 January 2008 is made in this paper.The unusual characteristics can provide the basis to understand the Huangshi area snowstorm’s surface layer physical process.The results show that:before the precipitation,the wind direction changed,the horizontal and vertical wind speed increase obviously,the turbulent flux become active,the turbulent kinetic energy and the turbulence intensity presented obvious peak values;after the precipitation,the turbulent kinetic energy reached to another peak value and then weakened slowly.Thus,obvious changes of the physical quantity field occurred before and after the snowstorm.更多还原