Abstract: The aim of this research is to investigate the factors affecting the diversion effect of rough strip energy dissipater on continuous curved spillway and its diversion characteristics. A physical model test was conducted using an orthogonal experimental design scheme involving nine factors and three levels. The ultra-high variation coefficient (C_v) is introduced to assess the diversion effect. Dimensional analysis and multiple regression analysis were performed to examine the factors impacting flow structure, and a multi-factor influence model for evaluating the diversion effect was established. The findings indicate that the angle and height of the rough strip significantly influence the flow structure in two bends, respectively, directly impacting the effectiveness of the rough strip in balancing water level differences and stabilizing flow patterns. By eliminating less influential common factors, the optimal diversion layout scheme for rough strip energy dissipator is determined. The maximum goodness of fit for various functional models is 0.822. The fitting equation is used to compare and validate the measured values, yielding a relative error of 2.78% to 7.15%. These research findings offer theoretical insights for analyzing and rectifying the flow in continuous curved spillways.

Key words: rough strip energy dissipator, continuous curved spillway, ultra-high variation coefficient, orthogonal design, multiple regression analysis