The wind-induced vibration behaviour of adjacent, plantation-grown Scots pine trees was ana-lysed by spectral methods and by the biorthogonal decomposition. Results from wavelet analy-ses demonstrate that covariation between wind loading in the range of the arrival frequency ofcoherent structures and wind-induced displacement of the sample trees was strong. Althoughseveral characteristic frequencies of tree vibration in response to wind excitation could be de-termined from Fourier energy spectra, covariation between wind loading and tree response inthe range of these frequencies was weak. However, characteristic vibration mode shapes wereassociated with each of the peaks in the Fourier spectra. Most of the energy of the wind, whichwas transferred into tree movement, was dissipated by.the deformation of the stem.
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