A combined fishway containing notched weir, central orifice and vertical slot with an identical layout was designed, and its turbulence characteristics were experimentally studied. An acoustic Doppler velocimetry (ADV) was used to measure three-dimensional velocity. Flow regime, average velocity, turbulence intensity, Reynolds stress, power frequency-spectrum, correlation function, turbulence scale were analysed. The experimental results showed the combined fishway was of remarkable three-dimensional flow structures. Longitudinal velocity exhibited obvious extreme value region on the horizontal plane. Extreme values of longitudinal turbulence intensity were concentrated mainly on the mixing region between weir flow and orifice jet, as well as the vertical slot wall jet region, extreme value region of transverse turbulence intensity occurred on the central plane of orifice jet, and extreme values of vertical turbulence intensity were scattered. Reynolds stress extreme value occurred mainly in the convergent zone of multiple jets. Dominant frequency of power frequency-spectrum was highest for notched weir and lowest for vertical slot. Longitudinal velocity fluctuation exhibited a correlation with time, which was characterised by dominant frequency. Turbulence scales showed eddy structures were related to flow zones.

设计了具有相同布局的缺口堰、中心孔口和垂直槽的组合鱼道，并对其湍流特性进行了试验研究。声学多普勒测速仪 (ADV) 用于测量三维速度。分析了流态、平均流速、湍流强度、雷诺应力、功率频谱、相关函数、湍流尺度。实验结果表明，组合鱼道具有显着的三维流动结构。纵向速度在水平面上表现出明显的极值区。纵向湍流强度极值主要集中在堰流与孔口射流的混合区，以及垂直槽壁射流区，横向湍流强度极值区出现在孔口射流的中心平面上，垂直湍流强度极值分散。雷诺应力极值主要出现在多股喷流的会聚区。功率频谱主频以缺口堰最高，垂直槽最低。纵向速度波动表现出与时间的相关性，其特征是主频。湍流尺度显示涡流结构与流动区有关。纵向速度波动表现出与时间的相关性，其特征是主频。湍流尺度显示涡流结构与流动区有关。纵向速度波动表现出与时间的相关性，其特征是主频。湍流尺度显示涡流结构与流动区有关。