Influence of Permeable Hole Arrangement on Flow Characteristics of Permeable Spur Dike Action Zone
In order to deeply understand the influence of the arrangement of permeable holes on the flow characteris-tics near the dam body,the three-dimensional instantaneous flow velocity of the flow near the permeable spur dike with five kinds of arrangement of permeable holes was measured by Doppler velocimeter(ADV)through indoor flume test.The distribution law of flow velocity and turbulence characteristics around the dam body was analyzed.The test results show that the influence of the arrangement of the permeable holes on the flow characteristics behind the dam is signifi-cantly greater than that in front of the dam.When the arrangement of permeable holes is grid type,the slow flow effect and velocity uniformity are better,and the slow flow rate reaches 36.09%.The three-layer arrangement is the second,and the single-layer arrangement is poor.With the increase of the distance from the permeable spur dike,the backflow phenomenon behind the dam is weakened,and the influence of the arrangement of the permeable holes on the flow charac-teristics gradually disappears.The research results can provide reference for structural optimization and engineering appli-cation of permeable spur dikes.
permeable spur dikepermeable hole arrangementflow velocity distributionturbulence intensityslug-gish flow ratio
万方数据
维普
