Colored Version of Figures 7.10 and 7.11

Fig. 7.10 Time history of vertical velocity component. Original measurements at 20 kHz (solid black line), samples extracted at 833 Hz (dots), super-sampled from 833 Hz to 20 kHz (solid red), linear interpolation of samples at 833 Hz (dashed blue)

 

 

Fig. 7.11 Amplitude spectrum of vertical velocity fluctuations. Comparison between reference data at 20 kHz (black), subsampled at 1.67 kHz (blue) and super-sampled by advection (red). Nyquist limit for the subsampled data indicated in dashed blue line