Hydraulic jump basins with wedge-shaped baffles  

作　　者：Ashraf Fathy ELLAYN 

机构地区：[1]Institute of Port, Coastal and Offshore Engineering, Zhejiang University

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第7期519-525,共7页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project supported by the National Natural Science Foundation of China (No. 50079025);the National Science and Technology Major Projects of China (No. 2009ZX07424-001)

摘　　要：This laboratory study deals with the hydraulic jump properties for an artificially roughened bed with wedge-shaped baffle blocks. The experiments were conducted for both smooth and rough beds with a Froude number in the range of 3.06≤F1≤10.95 and a relative bed roughness ranging 0.22≤KR≤1.4. The data from this study were compared with those of rectangular baffle blocks. New experimental formulae were developed for determining the sequent depth ratio and the hydraulic jump length in terms of the inflow Froude number and relative bed roughness. Bélanger's jump equation of a rectangular channel was extended to account for the implications of the bed shear stress coefficient attributable to channel bed roughness. It was found that, in comparison with the smooth bed, the wedge-shaped bed roughness reduced the sequent depth of the hydraulic jump by approximately 16.5% to 30% and the hydraulic jump length by approximately 30% to 53%.This laboratory study deals with the hydraulic jump properties for an artificially roughened bed with wedge-shaped baffle blocks. The experiments were conducted for both smooth and rough beds with a Froude number in the range of 3.06≤F1≤10.95 and a relative bed roughness ranging 0.22≤KR≤1.4. The data from this study were compared with those of rec-tangular baffle blocks. New experimental formulae were developed for determining the sequent depth ratio and the hydraulic jump length in terms of the inflow Froude number and relative bed roughness. Bdlanger＇s jump equation of a rectangular channel was extended to account for the implications of the bed shear stress coefficient attributable to channel bed roughness. It was found that, in comparison with the smooth bed, the wedge-shaped bed roughness reduced the sequent depth of the hydraulic jump by ap-proximately 16.5% to 30% and the hydraulic jump length by approximately 30% to 53%.

关 键 词：Energy dissipater Hydraulic jump Stilling basins Wedge-shaped bed roughness 

分 类 号：TV133[水利工程—水力学及河流动力学]