The local effect of intermittency on the inertial subrange energy spectrum of the atmospheric surface layer |
| |
| Authors: | Jozsef Szilagyi Gabriel G Katul Marc B Parlange John D Albertson Anthony T Cahill |
| |
| Institution: | (1) Hydrologic Science, University of California, 95616 Davis, California, USA;(2) School of the Environment, Duke University, 27708 Durham, North Carolina, USA |
| |
| Abstract: | Orthonormal wavelet expansions are applied to atmospheric surface layer velocity measurements. The effect of intermittent events on the energy spectrum of the inertial subrange is investigated through analysis of wavelet coefficients. The local nature of the orthonormal wavelet transform in physical space makes it possible to identify a relationship between the inertial subrange slope of the local wavelet spectrum and a simple indicator (i.e. the local variance of the signal) of local intermittency buildup. The slope of the local wavelet energy spectrum in the inertial subrange is shown to be sensitive to the presence of intermittent events. During well developed intermittent events (coherent structures), the slope of the energy spectrum is somewhat steeper than -5/3, while in less active regions the slope is found to be flatter than -5/3. When the slopes of local wavelet spectra are ensemble averaged, a slope of -5/3 is recovered for the inertial subrange. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
