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中文摘要：
局部冲刷造成的悬空是海底管线失效的最大诱发因素。对均流及波浪作用下铺设在海床表面管线的局部冲刷起动机理、临界条件以及2D局部冲刷机理、流一管一土耦合机理和3D局部冲刷机理等做了分析和总结。
英文摘要：
Free span by local scour is the chief factors leading to invalidation of submarine pipeline. Under the action of uniform current or wave, mechanism and critical condition about onset of local scour around submarine pipeline which is laying on seabed are illuminated. Meanwhile, under the action of steady current or wave, mechanism of 2D local scour, flow-pipe-soil coupling and 3D local scour underneath submarine pipeline laying on seabed are analyzed and summarized.
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