| 摘要: |
| 应用含湍流频散效应的近地面层的运动方程求解了不同层结下的风速廓线,着重分析了湍流频散效应对近地面层平衡运动的影响,分析指出:湍流的频散效应对经典的幂律廓线给出一对数型修正,该修正在不稳定层结时比稳定层结时明显；中性层结时由于幂律退化为对数律,因而修正表现为对对数律的修正,导致一修正的常数k1=(1+k/4)-1k.利用相似理论也得到了该常数。 |
| 关键词: 频散湍 流风 速廓线 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金 |
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| EFFECT OF TURBULENT DISPERSION ON VERTICAL PROFILE OF WIND SPEED IN SURFACE LAYER |
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Peng Weihong, Liu Shikuo
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Geophysic Department, Peking University Beijing, 100871
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| Abstract: |
| New Reynolds mean momentum equations including both turbulent viscosity and dispersion are used to analyze the vertical profile of wind speed in surface layer.It is pointed out that the wind profile of surface layer including turbulent dispersion is a power + logarithmic law,and under the neutral stratification, it is transformed into logarithmic,but the von Karman's constant k is replaced by k1=(1+k/4)-1k;under unstable stratification the effect of dispersion is stronger than under stable.In the light of the similarity theory the same constant is obtained. |
| Key words: Dispersion Turbulent Profile |
