An analysis of the turbulent structure in the unstable surface layer nearby a shelter belt |
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| Authors: | Zeng Zongyong Ma Chengsheng Liu Xiaochun Ling Huiqin |
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| Institution: | Anhui Institute of Optics and Fine Mechanics, Academia Sinica, Hefei,Anhui Institute of Optics and Fine Mechanics, Academia Sinica, Hefei,Anhui Institute of Optics and Fine Mechanics, Academia Sinica, Hefei,Anhui Institute of Optics and Fine Mechanics, Academia Sinica, Hefei |
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| Abstract: | An analysis was performed of the turbulent data obtained from Yucheng experimental station in the Shandong Province in 1984.
It is shown that at variant wind speed, the spectra of streamwise velocity remain similar and the intensity of wind fluctuations
is proportional to wind speed in the downwind area of shelter belt. Therefore, we may decide the similarity of wind fluctuations
by a speed scale and a length scale which is not correlated with stability, σu /V
o =F(X / H). The –5/3 power range of temperature spectra extends to lower frequency. The variation of ratio σo/T with stability becomes σo/T =C(X / H)( —Z / L)–1/3. There is not such an extension of-5/3 power range in the humidity spectra. |
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