杨大升. 1957. 北京低层高空的风速分布[J]. 气象学报, 28(3):185-197, doi:10.11676/qxxb1957.016
北京低层高空的风速分布
WIND PROFILE IN THE UPPER PLANETARY BOUNDARY LAYER OVER PEKING
投稿时间:1957-02-17  
DOI:10.11676/qxxb1957.016
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杨大升 北京大学 
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中文摘要:
      分析北京1954,1955两年气球测风的原始记录,根据500米高度上的风速,这些记录可以分作三类:大风,中风和弱风三种情形.中风情形的记录最多,因此根据中风情形记录所得到的平均风速分布较有代表性,本文对中风情形的实测风分布作了理论的研究.假定900米以下湍流系数K随高度改变,而且K=(a-bz)2;900米以上K为常数,则由湍流平均运动方程的确解所算得之风速分布几乎和实测者完全一致.最后,本文还讨论了Д.Л.лайхтман所建议的根据实测风决定湍流系数K的方法,指出应用这种方法时所须注意之点.
英文摘要:
      The wind data from free ballon at Peking in the years 1954-1955 are analysed and are grouped according to the wind velocity on X00 m level into three sets, namely:strong, moderate, and light wind. Since the data are abundant for moderate wind, and its wind profile is more representative, a theoretical investigation is proposed. Assuming the turbulent coefficient K varies with height according as K=( 7.7-4.8×10-3z)2 for:z≤900 m; and K=const=12 m2/sec for z≥000m, it is found that the calculated wind profile agrees very well with the observation. Finally, some comments are given to the new method proposed by Д.Л.лайхтман for the determination of the turbulent coefficienth from wind data.
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