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Air entrainment onset in skimming flows on steep stepped spillways: an analysis

The Discussers have read the paper with interest and congratulate the Authors for their remarkable contribution. Their work gives a comprehensive overview of several physics-based criteria for air entrainment into flows on steep stepped spillways using laboratory observations and numerical simulations. The Discussers focus on analogies and differences of the location and depth of the inception point in studies of Wu, Zhang, and Ma (2013) and the Authors. The Discussers’ experiments were conducted in the highspeed flow laboratory of the Hohai University (Fig. D1), aiming at researching the features of the inception point on steep stepped spillways. The stepped chute is 0.275 m wide and with