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高原气象 2011

天津城市边界层湍流统计特征

, PP. 1481-1487

Keywords: 天津,城市边界层,湍流统计特征,湍流通量,莫宁-奥布克霍夫

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Abstract:

利用2008年2月1～28日在天津气象塔上观测的超声风\,温资料和常规风\,温及湿梯度资料，计算了天津城市边界层无量纲湍流速度方差、湍流温度方差、感热通量、动量通量和湍流动能。结果表明,在不稳定层结条件下，40m高度上无量纲湍流速度方差和湍流温度方差遵循莫宁－奥布克霍夫相似理论，在220m高度上只有垂直方向上的湍流速度方差遵循莫宁－奥布克霍夫相似规律，其他变量均不遵循这一规律。城市复杂下垫面特征主要影响风速的水平分量方差，对风速垂直分量方差影响不大。湍流通量和湍能均具有明显的日变化特征。

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