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Spur dikes are known to perform two functions. One is retardation of flow along a riverbank owing to their roughness. The other is the control of flow direction by splashing the water. Focus on the above two functions led to the use of dikes mainly for preventing bank erosion and destruction of revetments, modifying the alignment of low water channels, controlling flood for navigation and utilizing water. Interaction between cavity flow and main flow in an open channel with a series of non-submerged dikes has yet to be fully discussed. In this study, experiments were executed to clarify momentum exchanges between main flow and cavity flow. In the experiment, two-dimensiona flow field in a horizontal cross-section was measured by PIV (particle image velocimetry). The results showed that prominent water surface oscillation happened in an arrangement of spur-dikes and have strong influence on turbulent flow characteristics and momentum exchange between spur dikes region and main flow one.

TURBULENT FLOW AND FREE-SURFACE OSCILLATION IN AN OPEN CHANNEL WITH SPUR DIKES