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Open AccessArticle

Wavelet Scale Variance Analysis of Wind Extremes in Mountainous Terrains

Institute of Methodologies for Environmental Analysis, National Research Council, 85050 Tito (PZ), Italy
IDYST, Faculty of Geosciences and Environment, University of Lausanne, CH-1015 Lausanne, Switzerland
WSL Institute for Snow and Avalanche Research SLF, 7260 Davos, Switzerland
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3048;
Received: 12 June 2019 / Revised: 16 July 2019 / Accepted: 2 August 2019 / Published: 7 August 2019
(This article belongs to the Section Wind, Wave and Tidal Energy)
The 10-min average wind speed series recorded at 130 stations distributed rather homogeneously in the territory of Switzerland are investigated. Fixing a percentile-based threshold of the wind speed distribution, a wind extreme is defined as the duration of the sequence of consecutive wind values above the threshold. This definition allows to analyze the sequence of extremes as a temporal point process marked by their duration. Representing the sequence of wind extremes by the inter-extreme interval series, the wavelet variance, a useful tool to investigate the variance of a time series across scales, was applied in order to find a link between the wavelet scales and several topographic parameters. Our findings suggest that the mean duration of wind extremes and mean inter-extreme time are positively correlated and that such relationship depends on the threshold of the wind speed. Furthermore, the threshold of the wind speed distribution correlates best with a terrain parameter related to the Laplacian of terrain elevations; and, in particular, for wavelet scales less than 3, the terrain exposure may explain the formation of extreme wind speeds. View Full-Text
Keywords: wind; extremes; wavelet wind; extremes; wavelet
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Telesca, L.; Guignard, F.; Helbig, N.; Kanevski, M. Wavelet Scale Variance Analysis of Wind Extremes in Mountainous Terrains. Energies 2019, 12, 3048.

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