Spur dikes are known to perform two functions. One is reduction of flow velocity along river banks owing to their roughness. The other is the control of flow direction by splashing water. Historically, the development of spur dikes reflects the level of understanding of river phenomena and technology. Focus on the above two functions has led to the use of spur dikes mainly for preventing bank erosion and destruction of revetments, modifying the alignment of low water channels, controlling flood water for navigation and domestic water use. In this study, we investigated experimentally the effects of non - submerged spur dikes and submerged spur dikes on bed configuration, secondary momentum exchange between main flow region and spur - dike zones. Results showed that in case of spur dikes were positioned facing upstream and downstream, submerged spur dikes have more various bed deformation around spur dike than non - submerged spur dikes, and that prominent water surface oscillations occurred with specific arrangements of spur dikes and that various arrangements could be correlated with fluctuations in velocity and rate of water exchange, but they did not influence Reynolds shear stress.
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