EXPERIMENTAL STUDY ON THE STRUCTURE OF OPEN CHANNEL FLOW WITH IMPERMEABLE SPUR DIKES

It is important for river engineers to know the hydraulic roles of spur dikes. A series of laboratory tests for horizontal structure of open channel flow with spur dikes was performed by varying theinterval of spur dikes. The results indicate that the structure of flow is different according to the in The reattachment length is found to be a function of the interval of spur dikes. The momentum transport rate between the main flow region and spur dike region in the most upstream spur dike region takes a peak when the interval is 4. 0 times of the length of a spur dike. The flow near the tip of the subsequent spur dike plays an important role in the momentum transport rate in the first spur dike region.