DEPENDENCE OF TURBULENT VELOCITY VARIANCES ON SCALE AND STABILITY

摘要

Turbulent variances and kinetic energy have been successfully approximated by turbulence similarity theory, although differences exist between studies. Discrepancies are greatest for very stable conditions. Existing formulations poorly describe mesoscale variations. Smedman (1988) finds that mesoscale motions do not obey Monin-Obukhov similarity theory and their inadvertent inclusion in the turbulence variances degrades the performance of similarity theory. Separation between turbulence and mesoscale variances is required to understand the behavior of turbulence in very stable conditions and formulate these variances. One application of formulated variances is the modeled relationship between dispersion and the standard deviation of the crosswind velocity (Kristensen et al., 1981; Hanna, 1983; Skupniewicz, 1987; Lyons and Scott, 1990), one of the goals of this study.