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Determining the Scour Dimensions Around Submerged Vanes in a 180°Bend with the Gene Expression Programming Technique

查看全文 作　　者：Saeid [1]Shabanlou;Hamed [2,3]Azimi;Isa [2,3]Ebtehaj;Hossein [2,3]Bonakdari 高影响力作者 机构地区：[1]Department of Water Engineering,Kermanshah Branch,Islamic Azad University,Kermanshah 67146,Iran;[2]Department of Civil Engineering,Razi University,Kermanshah 67146,Iran;[3]Environmental Research Center,Razi University,Kermanshah 67146,Iran高影响力机构 出　　处：《Journal of Marine Science and Application》索引2018年第17卷第2期,共8页高影响力期刊 摘　　要：Submerged vanes are installed on rivers and channel beds to protect the outer bank bends from scouring.Also,local scouring occurs around the submerged vanes over time,and identifying the effective factors on the scouring phenomena around these submerged vanes is one of the important issues in river engineering.The most important aimof this study is investigation of scour pattern around submerged vanes located in 180°bend experimentally and numerically.Firstly,the effects of various parameters such as the Froude number(Fr),angle of submerged vanes to the flow(α),angle of submerged vane location in the bend(θ),distance between submerged vanes(d),height(H),and length(L)of the vanes on the dimensionless volume of the scour hole were experimentally studied.The submerged vanes were installed on a 180°bend whose central radius and channel width were 2.8 and 0.6 m,respectively.By reducing the Froude number,the scour hole volume decreased.For all Froude numbers,the biggest scour hole formed atθ=15°.In all models,by increasing the Froude number,the scour hole volume significantly increases.In addition,by increasing the submerged vanes’length and height,the scour hole dimensions also grow.Secondly,using gene expression programming(GEP),a relationship for determining the scour hole volume around the submerged vanes was provided.For this model,the determination coefficients(R2)for the training and test modes were computed as 0.91 and 0.9,respectively.In addition,this study performed partial derivative sensitivity analysis(PDSA).According to the results,the PDSA was calculated as positive for all input variables. 关 键 词：180°bend SUBMERGED vanes SCOUR HOLE volume Gene expression PROGRAMMING Partial DERIVATIVE sensitivity analysis
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