Experimental Study on Optimizing Energy Dissipation by Adding Pier to Steep Chute of Open Channel in Wet Collapsible Loess Area
Adding piers to open channel chute is a highly efficient approach for enhancing energy dissipation,and holds a significant technological edge especially under specific conditions.This approach remains relatively unex-plored within China's research fields.We conducted a 1∶30 scale hydraulic model test on adding piers to the open channel chute of a rainwater drainage project in Xiaokongtong gully,Qingyang,Gansu.The initial design revealed that the flow regime was unstable,characterized by outward splashing that potentially harms the structural integrity of the loess slopes.In response,we refined the original design by reducing the spacing between the energy dissipa-tion piers.This modification significantly stabilized the flow.Specifically,reducing the pier spacing from H/i to 0.5H/i under peak flow conditions achieved a 72.5％reduction in water surface fluctuation and a 40.10％decrease in average flow rate,leading to a more uniform water depth distribution along the channel and eliminating the splas-hing.Moreover,the total energy dissipation rate improved markedly,increasing from 87.9％to 94.6％.
wet collapsible loess areaadding pier to open channel chutemodel testenergy dissipationwater surface fluctuations
万方数据
维普
