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Connected-ripraps is one of the new methods for river improvement and it begun to be used in recent years in Japan. This is made by several ripraps connecting with wires and chains, and preserve stability more than using usual riprap individually. It is expected to save labor for river maintenance work and costs. Ripraps are often set in river for bank erosion control or prevention of bed scour. Since connected-ripraps have environmental advantage of porous structure as good as individual riprap and has high stability in rapid flow. Although such materials are in practical use in river channels, they have not been subjected to hydraulic analysis. We verified the stability and destruction process of connected-ripraps that were set on river bed by experiment and numerical analysis.

STABILITY AND DESTRUCTION PROCESS OF CONNECTED-RIPRAPS SET ON RIVERBED