Fig. 1. Time scale map of wavelet coefficient of F(t)

Fig. 2. Wavelet energy diagram of F(t)

Fig. 3. (a) Comparison of F(t) and f(a*,t); (b) comparison of f(t) and f(a*,t)

Fig. 4. (a) Time scale map of wavelet coefficient of U1; (b) time series of U1

Fig. 5. Time scale map of wavelet coefficient of wind velocity fluctuation. (a) V1; (b) W1

Fig. 6. Wavelet energy curves of three-dimensional wind velocity fluctuation. (a) U1; (b) V1; (c) W1

Fig. 7. Comparison of wind velocity fluctuation signal and coherent waveform signal. (a) U1; (b) V1; (c) W1

Fig. 8. Probability distributions of reconstructed deviation. (a) ΔU1; (b) ΔV1; (c) ΔW1

Fig. 9. Comparison of power spectra of wind velocity fluctuation and coherent signals. (a) U1; (b) V1; (c) W1

Fig. 10. Probability distributions of coherent structure at different scales. (a) U1; (b) V1; (c) W1

Fig. 11. Probability distribution of period and scale ratio of coherent structure