Effects of Locations of Spur Dyke on Bed and Scour around Bridge Piers in Meandering Channel

作     者：M.Athar Farha Naz Humaira Atahr 

作者机构：Civil Engineering DepartmentAligarh Muslim UniversityAligarhU.P.India Innovative Building Materials DivisionCSIR-CBRIRoorkeeUttarakhand247667India 

出 版 物：《Hydro Science & Marine Engineering》 (水利科学与海洋工程（英文）)

年 卷 期：2022年第4卷第1期

页      面：1-7页

学科分类：08[工学] 0815[工学-水利工程] 

主　　题：Spur dykes Bridge piers Angular displacement Scour and deposition 

摘      要：Spur dykes are the structures which are used to protect the eroding bank of rivers.They are sometimes also used to safeguard the life of many struc­tures such as bridge piers,abutments etc.The efficiency of spur dykes has been checked in straight channels by conducting model tests in laboratories by many investigators.Very few studies were done in curved channels.In present work an attempt has been made to study the effect of location of spur dyke on bed and scour around bridge pier in curved open channel(bend angle=80o)with time.Experiment has been carried out in 80o channel bend at constant discharge(3.5×10^(-3) m^(3)/s)and bridge pier is located at angular displacementϴ=60o.Hereϴis the angle the line drawn at the inlet of any bend to the line joining the centre of curvature and any point on the outer portion of the bend.It is found that maximum scouring occurs atϴ=0o and 20oalong inner wall and atϴ=60o and 80o along outer wall.It is also found that scouring around bridge pier is more in the vicinity of pier and decreases with increase in distance from pier.The most suitable location for spur dyke to protect bridge pier is at angular displacementϴ=20o.Scour developed rapidly during initial time and then rate of scouring decreases with elapse of time.