LOCAL SIMILARITY RELATIONSHIPS IN A HORIZONTALLY INHOMOGENEOUS BOUNDARY-LAYER

被引:43
作者
SHAO, YP
HACKER, JM
机构
[1] Flinders Institute for Atmospheric and Marine Sciences, Bedford Park
关键词
D O I
10.1007/BF00123176
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Local similarity theory, an analogy to the Monin-Obukhov similarity theory, is successfully applied to airborne observations in a coastal area of South Australia. The boundary layer over this highly non-uniform surface is characterized by extensive variations in its thermal stratification and turbulence characteristics. However, the behaviour of some statistical parameters of second- and higher moments seems to be determined mainly by local forcing, while horizontal advection plays a less important role. For these parameters, local scaling is effective. It is shown that the dimensionless variances of vertical velocity and potential temperature are functions of z/λ only, where λ is the local Monin-Obukhov length and z is the height above ground. The dimensionless variance of horizontal velocity components is found to depend on h/λ, where h is the height of the oundary layer. Similarity relationships for some triple correlations are also discussed. The empirically determined local similarity relationships are found to agree with those obtained from surface-layer similarity. Finally, to illustrate the complexity of the local forcing, distributions of vertical energy and momentum fluxes, from which the local scaling parameters are derived, are shown. © 1990 Kluwer Academic Publishers.
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页码:17 / 40
页数:24
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