Reducing bed scour in meandering channel bends using spur dikes  

作　　者：Zeeshan Akbar Ghufran Ahmed Pasha Norio Tanaka Usman Ghani Hossein Hamidifar 

机构地区：[1]Department of Civil Engineering,The University of Faisalabad,38000 Faisalabad,Pakistan [2]Department of Civil Engineering,University of Engineering&Technology,47050 Taxila,Pakistan [3]Graduate School of Science and Engineering,Saitama University,255 Shimo-okubo,Sakura-ku,Saitama 338-8570,Japan [4]International Institute for Resilient Society,Saitama University,255 Shimo-okubo,Sakura-ku,Saitama 338-8570,Japan [5]Water Engineering Department,Shiraz University,Shiraz 71441,Iran

出　　处：《International Journal of Sediment Research》2024年第2期243-256,共14页国际泥沙研究（英文版）

摘　　要：A river's planform pattern changes due to erosion of banks and the bed near the outer bend.The primary cause of these planform changes is the formation of helical flow patterns in response to centrifugal forces.Uncontrolled bed scouring can have a negative impact on the river's geometry,aquatic habitat,and floodplains.To alleviate this scouring,various structures,such as spur dikes,can be placed at any accessible location along the bend.The current research was accomplished by installing two meandering models with different sinuosities of 1.3 and 1.5,in a flume.For both sinuosities,the maximum bed scour was observed at an approximate angle of 45°relative to the bend apex.Thus,the main objective was to control this maximum scour by installing spur dikes with varying porosities,ranging from 0%to 75%,at five locations along the outer bend.The spur dikes were found to divert the helical flow regime away from the outer bend and protect the riverbed from severe scouring.However,the results show that the effectiveness of spur dikes decreases as sinuosity increases.Furthermore,for both meandering models,a 50%permeable spurdike installed atthe+30°location yielded thebest performance.Finally,a regression-based predictive equation is proposed to determine the proportion of scouring around a spur dike in a meandering channel.

关 键 词：Meandering channel Spur dike POROSITY SINUOSITY Location of spur dike River planform changes 

分 类 号：TV863[水利工程—水利水电工程]