This study investigates the geometric parameters of a two-stage stilling basin; 14 sets of tests were carried out in a horizontal flume with a supercritical inflow of relatively low Froude number (Fr₁ = 1.1 ∼ 1.85). The flow pattern, relative amplitude of the tailwater, and energy dissipation ratio were investigated. The two-stage stilling basin led to a hydraulic jump at each stage. Compared to the corresponding classical jump, the energy dissipation ratio in the two-stage stilling basin could be increased by 30%–45%. Herein, a novel method is proposed to calculate the energy dissipation ratio and relative amplitude of the tailwater. The investigation demonstrates the potential of two-stage stilling basin with low-Froude-number flow.

本研究研究了两级消力池的几何参数；在弗劳德数较低（Fr ₁  = 1.1 ∼ 1.85）的超临界流入水平水槽中进行了14组试验。研究了流型、尾水相对振幅和能量耗散比。两级消力池在每一级都会产生水力跳跃。与相应的经典跳跃相比，两级消力池的能量耗散率可提高30%~45%。本文提出了一种计算尾水能量耗散率和相对振幅的新方法。研究证明了低弗劳德数流的两级消力池的潜力。