Discussion of ''Simulation of Scour Process in Plunging Pool of Loose Bed-

The discussers first want to congratulate the writers for their valuable study on scouring in plunge pools of loose bed-material. The writers pointed out that the exact physical mechanism of particle pickup has to be further investigated in order to improve the understanding of the scouring process. Since the physical background of particle pickup is very complex, they used an empirical expression to calibrate the model constant that relates the pressure fluctuations at the plunge pool bottom with the effective fluctuating lift force on the particle. The discussers would like to present part of the results of their research, because of its particular compatibility with the authors’