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Scouring downstream of hydraulic structures is a complex phenomenon that causes the instability and even the failure of the structures. This experiment-based research was conducted to study the effect of the protection work length, L, along the embankment landside slope on the relationship between non-dimensional scour depth (SD/Lsinθ) and its location ( SP/Lcosθ) under various overtopping flow depths (SD: maximum scour depth, SP: the location of SD, and θ: the landside slope angle) . For evaluating the possibility of the fragility of the embankment landside slope, a schematic diagram based on the angle of repose of foundation behind embankment toe is proposed in this study. The result shows that the effect of the protection work length on the risk of the embankment landside slope fragility are classified into 3 types according to the variation of the overtopping flow depths.

GEOMETRICAL CHARACTERISTIC OF SCOUR HOLES CAUSED BY OVERTOPPING FLOW OF EMBANKMENT COVERED WITH DIFFERENT LENGTHS OF PROTECTION WORKS