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- Title
Temporal Coherence: A Model for Non-stationarity in Natural and Simulated Wind Records.
- Authors
Rinker, Jennifer; Gavin, Henri; Clifton, Andrew; Veers, Paul; Kilcher, Levi
- Abstract
We present a novel methodology for characterizing and simulating non-stationary stochastic wind records. In this new method, non-stationarity is characterized and modelled via temporal coherence, which is quantified in the discrete frequency domain by probability distributions of the differences in phase between adjacent Fourier components. Temporal coherence can also be used to quantify non-stationary characteristics in wind data. Three case studies are presented that analyze the non-stationarity of turbulent wind data obtained at the National Wind Technology Center near Boulder, Colorado, USA. The first study compares the temporal and spectral characteristics of a stationary wind record and a non-stationary wind record in order to highlight their differences in temporal coherence. The second study examines the distribution of one of the proposed temporal coherence parameters and uses it to quantify the prevalence of nonstationarity in the dataset. The third study examines how temporal coherence varies with a range of atmospheric parameters to determine what conditions produce more non-stationarity.
- Subjects
ATMOSPHERIC turbulence; WIND speed; FREQUENCY-domain analysis; DISTRIBUTION (Probability theory); FOURIER analysis
- Publication
Boundary-Layer Meteorology, 2016, Vol 159, Issue 2, p373
- ISSN
0006-8314
- Publication type
Article
- DOI
10.1007/s10546-015-0121-x