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急流收缩时会产生冲击波， 故边墙高度要比一元方程计算结果大得多。当收缩段的边墙为直墙时， 收缩段内可产生３ 种不同的波： （１） 收缩起始点下游的波； （２） 泄槽轴线上的波；（３） 收缩末端以外的沿墙波。引用激波数的概念， 在试验中针对不同的收缩比和底坡， 研究了３ 种波的特性， 并寻求削弱冲击波的措施。提出了一种将致偏体作为削波构件的建议， 并对非设计水流和阻壅水流作了研讨。
Shock will produce Shock Shock contraction, so the side wall height than the unified equation results much larger. When the side wall of the contraction section is a straight wall, three different waves can be generated in the contraction section: (1) the wave downstream of the contraction start point; (2) the wave on the axis of the leak groove; (3) Wall wave. By referring to the concept of shock wave numbers, the characteristics of the three kinds of waves were studied for different shrinkage ratios and slopes in the experiment and the measures to weaken the shock wave were sought. A suggestion was made to use the deflecting body as the clipping member, and the non-design flow and the impeding flow were discussed.