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Stone stability of granular bed protections in the marine environment
This study is carried out to understand the effect of stone exposure/protrusion and bottom turbulence on stone stability and bed damage of marine scour protections. The research outcome will provide a set of guidance for the engineering design of scour protection. It was found from the experiments that the stone protrusion is strongly correlated to non-dimensional shear stress. When protrusion approach 0.2d where d is diameter of the protruding stone, critical shear stress reach an asymptotic value. When protrusion is 0 (co-planar bed), no stone movements were observed. These results clearly indicate that the method of placement, precision and construction quality is important for the stability of a scour protection. However, critical shear stress for waves is higher than for currents. It is hypothesised that this behaviour is due to the flow reversal at the bed for waves, where a counter balancing force is created to oppose the shear stress. This requires the application of a higher shear stress for waves than for currrents to dislodge a stone from the bed. The proposed pressure measurement on an overlying stone and one within the bed will shed more light on this behaviour.
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