海洋科学2025，Vol.49Issue(1)：21-31,11.DOI:10.11759/hykx20241125001
单向流作用下活动沙丘对过境管道附近底床冲刷影响研究
Study on the effect of active sand dune on seabed scouring near transit pipeline under unidirectional flow
摘要
Abstract
Under the influence of a complex and variable seabed environment,the scouring of the seabed may occur,causing submarine pipelines to become exposed.At present,the research and understanding of submarine pipeline scour are mostly based on a flat bottom bed,and there is insufficient understanding of the local scouring behavior and dynamic mechanisms of submarine pipelines in complex seabed conditions,especially an active bottom bed.Through indoor flume experiments and numerical simulations,the influence of active dunes under unidirectional flow on the local scouring characteristics of transit pipelines'bottom beds is analyzed,and its dynamic mechanism is proposed.The results show that when the transit pipeline is located on the headwater side of the dune,scouring on the downstream side of the pipeline is faster and more serious,and then three dynamical processes will be expe-rienced in the vicinity of the pipeline:eddy scouring at the front end of the pipeline,trailing eddy scouring at the back end of the pipeline,and scouring at the bottom orifice.When a pipeline is located on the backflow side of the dune,scouring on the upstream side of the pipeline is more serious;flow separation on the backflow side of the dune and the reversal in the flow direction near the bottom bed within the flow separation zone make the local scouring of the pipeline to occur first on its headwater side.In addition,the smaller the initial burial depth of the pipeline,the bigger will be the size of the scouring pit;the bigger the angle of the extension of the pipeline is,the bigger is the size of the scouring pit.The results of this study provide a scientific reference for the rational assess-ments of the impact of active and complex bottom beds on submarine engineering facilities.关键词
移动沙丘/过境海底管道/局部冲刷/单向流Key words
moving dune/transit submarine pipeline/localized scour/unidirectional flow分类
海洋学引用本文复制引用
高敏,马小川,何艺玮,龚腾..单向流作用下活动沙丘对过境管道附近底床冲刷影响研究[J].海洋科学,2025,49(1):21-31,11.基金项目
国家自然科学基金(42276057,41876035) （42276057,41876035）
中国地质调查局舟山海洋地质灾害野外科学观测研究站开放基金(ZSORS-22-06)the National Natural Science Foundation of China,Nos.42276057,41876035 （ZSORS-22-06）
China Geological Survey Zhoushan Marine Geological Hazard Field Scientific Observation and Research Station Open Fund,No.ZSORS-22-06] （）
