Countermeasure of river bend scour using a combination of submerged vanes and riprap  

作　　者：Piya Biswas Abdul Karim Barbhuiya 

机构地区：[1]Department of Civil Engineering, National Institute of Technology

出　　处：《International Journal of Sediment Research》2018年第4期478-492,共15页国际泥沙研究（英文版）

基　　金：Funding provided by the Department of Science and Technology (DST), Government of India, through Grant DST No: SR/S3/ MERC/095/2008;support provided by the laboratory staff of the National Institute of Technology

摘　　要：A series of laboratory flume experiments were done in a large-scale 180~ bend with non- cohesive sediment to find optimal or effective protection works at a bend, Detailed study of the scour and flow field dynamics with and without protection works was done, Spatially dense, high frequency velocity data were collected and analyzed to describe the pattern and magnitude of three-dimensional （3D） velocity throughout the bend, Characterizing the role of flow field dynamics on the pattern of deposition and erosion through experimental measurements provided valuable data about how such flow features contribute to scour and about the performance of the protection works, From the experimental results, it is revealed that for a perennial river it is not possible to protect from scour either with riprap or with submerged vanes alone, Protection from scour at a bend can be achieved with proper combination of these two works, First, submerged vanes can protect the toe, and, second, riprap can protect the upper part of the slope if it is not damaged through toe erosion, The experiments convincingly demonstrate the efficiency of this bank protection technique,A series of laboratory flume experiments were done in a large-scale 180~ bend with non- cohesive sediment to find optimal or effective protection works at a bend, Detailed study of the scour and flow field dynamics with and without protection works was done, Spatially dense, high frequency velocity data were collected and analyzed to describe the pattern and magnitude of three-dimensional （3D） velocity throughout the bend, Characterizing the role of flow field dynamics on the pattern of deposition and erosion through experimental measurements provided valuable data about how such flow features contribute to scour and about the performance of the protection works, From the experimental results, it is revealed that for a perennial river it is not possible to protect from scour either with riprap or with submerged vanes alone, Protection from scour at a bend can be achieved with proper combination of these two works, First, submerged vanes can protect the toe, and, second, riprap can protect the upper part of the slope if it is not damaged through toe erosion, The experiments convincingly demonstrate the efficiency of this bank protection technique,

关 键 词：River bend erosion Three-dimensional flow Vanes RIPRAP Open channel SEDIMENTATION 

分 类 号：TV147[水利工程—水力学及河流动力学]