Experimental Study On Water Flow Characteristics Of Permeable Butyl Dam Under Different Voids

The layout of the butyl dam can play the depth of scour channel and reduce the flow rate of near-shore flow,so as to improve the role of offshore protection shoreline,and the butyl dam,as the most commonly used remediation building,is widely used in the actual waterway regulation project in the upper reaches of the Yangtze River.In engineering practice,stone-throwing butyl dam is used,and this kind of butyl dam has certain permeability,so little consideration is given to the influence of permeability on this kind of butyl dam in the existing study of water Saudis in the upper reaches of the Yangtze River,and different voids and voids have different effects on improving the water level and velocity field around the permeable butyl dam.Therefore,it is of great significance to study the flow characteristics of permeable butyl dam under different voids,and to make better use of the role of the regulation building in the Waterway regulation project in the form of permeable structure,the research results of this paper are to optimize the design of waterway regulation buildings in the upper reaches of the Yangtze River and improve the effect of waterway regulation,Has a certain reference value.Based on the previous research results of many scholars and engineering researchers,this paper makes three groups of permeable butyl dams with different voids and six groups with different voids,and through the combination of the Generalization model test and theoretical analysis of the water fixed bed sink,the system studies the different control flow,The distribution of surface line,flow rate and turbulent strength around the permeable butyl dam under different voids and different voids,and compared with the solid butyl dam,the influence law of the flow characteristics around the permeable butyl dam under different voids is obtained,and the following main conclusions are obtained:(1)Permeable butyl dam is superior to solid butyl dam in reducing cross-longitudinal ratio drop,increasing water depth of narrow section in mainstream area and improving downstream water depth,and the effect of permeable butyl dam is relatively optimal in small voids and small voids.(2)The influence of permeable butyl dam on the flow rate of water flow is very obvious,especially to the main area around the dam head and the right bank of the permeable butyl dam,and the permeable butyl dam can effectively reduce the flow rate in the mainstream area of the right bank and near the dam head under the condition that the flow rate in front and after the dam increases little.(3)The turbulent intensity near the permeable butyl dam is negatively correlated with the flow rate and the voids,and the size of the voids is negatively correlated as a whole,with a slight rebound in the medium voids,the turbulent strength under the permeable butyl dam is smaller than that of the solid butyl dam.Compared with the solid butyl dam,the permeable butyl dam has a small difference in the effect of congestion water on the upstream,which generally increases the depth of the lower reaches of the butyl dam,reduces the ratio of vertical to surface water,reduces the flow rate,reduces the turbulent intensity of the water flow,improves the flow pattern of the narrow section of the right beam of the butyl dam Improve the ecological environment and other aspects have a more positive impact,and there is a relatively optimal voids and voids,in all aspects of the effect is relatively optimal.