Author(s): A. J. Grass; A. Hosseinzadehdalir
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Abstract: Oil, gas and long coastal outfall pipelines laid directly on a sandy seabed can be subject to severe under-scour if the local tidal and wave induced currents are sufficiently strong. Such scour is of both major engineering concern and interest. Free spans, bridging across scour holes, can present local buckling problems and can also be subject to large amplitude, resonant vibration induced by vortex shedding. On the positive side, the scour process can lead to self- burial of the pipelines. This natural phenomenon has been extensively exploited in the Dutch sector of the North Sea to effectuate the required burial of oil and gas pipelines. Avoiding mechanical trenching and backfill produces significant cost savings (Grass er al., 1987)
Year: 1995