Physics – Geophysics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3511804k&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 11, CiteID L11804
Physics
Geophysics
3
Atmospheric Processes: Turbulence (4490), Mathematical Geophysics: Time Series Analysis (1872, 4277, 4475), Hydrology: Streamflow, Nonlinear Geophysics: Complex Systems, General Or Miscellaneous: Techniques Applicable In Three Or More Fields
Scientific paper
Delimiting effectively the extent of the major motions in atmospheric, tidal and fluvial turbulent flows is an important task for studies of mixing and particle transport. The most common method for this (quadrant analysis) is closely linked to the turbulent stresses but subdivides active periods in the flow into separate events. A method based on the pointwise Hölder characteristics of the velocity data is introduced in this paper and applied to extract the whole duration of the active periods, within which turbulence intensities and stresses are high for some of the time. The cross-correlation structure of the Hölder series permits a simple threshold to be adopted. The technique is tested on data from a turbulent wake in a wind tunnel and flow over a forest canopy.
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