Time-Frequency Characteristics of Fluctuating Pressure on the Bottom of the Stilling Basin with Step-Down Floor Based on Hilbert–Huang Transform

Figure 8

Hilbert marginal spectrum and power spectrum density diagram of characteristic points when Q = 0.09 m³/s: (a) η = 0.025; (b) η = 0.075; (c) η = 0.125; (d) η = 0.175; (e) η = 0.225; (f) η = 0.325; (g) η = 0.45; (h) η = 0.65.

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(h)