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黄河上游玛曲草原湍流统计特征分析

DOI: 10.11867/j.issn.1001-8166.2012.08.0901, PP. 901-907

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Abstract:

湍流运动是大气最基本的运动特征,是大气能量物质交换的主要方式。利用玛曲气候与环境综合观测研究站2006年12月至2007年1月的湍流观测资料,分析了湍流方差特征、湍流动能及湍流强度等湍流统计特征,结果表明无量纲化的风速脉动σu/u*,σv/u*,σw/u*与稳定度z/L符合1/3次方规律;大气处于中性层结时,在近中性条件下,无量纲化风速方差σu/u*,σv/u*,σw/u*分别趋于常数A=3.42,B=3.34,C=1.02;无因次化温度脉动方差σT/|T*|和湿度脉动方差σq/|q*|与稳定度z/L的变化都比较离散,基本上不能拟合出-1/3次方规律。湍流动能随风速增大而增大,白天比夜间明显,相比之下,夜间湍流动能较小,且随风速的增大比较缓慢;湍流动能随稳定的变化是非常明显的,在稳定度近中性时湍流动能取得最大值。湍流强度Iu,Iv,Iw随风速的增大而减小,当风速在0m/s5m/s时,湍流强度变化很小。

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