Morning Boundary-Layer Turbulent Kinetic Energy by Theoretical Models |
| |
Authors: | A B Nunes H F Campos Velho P Satyamurty G Degrazia A Goulart U Rizza |
| |
Institution: | (1) Department of Biological and Agricultural Engineering, The University of Georgia, 1109 Experiment st., Griffin, GA 30223, USA;(2) Lab for Environmental Physics, The University of Georgia, 1109 Experiment st., Griffin, GA 30223, USA;(3) Department of Geography, University of Florida, Gainsville, FL 32611, USA |
| |
Abstract: | A major factor that influences the diurnal variation of turbulent kinetic energy (TKE) is the sensible heat flux at the surface.
Here, the TKE variations are analysed during the morning transition phase because subsequent to the neutral or stable stratification
during the night, peaks of concentration of scalars develop. The characteristics of the TKE during the growth phase of convection
are analysed with the help of two analytical models. For this purpose, a three-dimensional spectral model of the growth of
convection, starting from a neutral layer, and other formulations of micrometeorological parameters such as the convective
and neutral spectra, velocity variance and dissipation rates are utilised. The peak values in the TKE spectra in the lower,
middle and upper levels of the convective boundary layer showed a migration to higher wavelengths as the convection increased
with time. The TKE evolutions generated by the analytical models agree fairly well with the results of large-eddy simulation
for three vertical levels. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|