Abstract
Local scour of the seabed near a submarine pipeline is a major factor in pipeline damage and failure. Previous studies on local scour of submarine pipelines mainly focused on fluid flow and sediment transport, ignoring the influence of vibration on the local scour process. In this study, a two-dimensional scour model based on the time-averaged N–S equation was established to analyze the local scour and vortex-induced vibration of the pipeline. The clear-water and live-bed scours beneath submerged horizontal pipelines are presented under current-wave coupling conditions. The study shows that when the submarine pipeline is partially suspended, the vibration of the submarine pipeline is gradually intensified under the action of waves and currents and then affects the scour process near the pipeline, especially for KC numbers larger than 0.8. In addition, thresholds of embedment depth e/D = 0.4 and relative water depth h/D = 6.7 were found, that is, the influence of bed and free surface on the scouring process are greatly reduced once these thresholds are met.
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