Field measurements of cable self-burial in a sandy marine environment
Field measurements of cable self-burial in a sandy marine environment
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DOI：
10.1016/j.coastaleng.2023.104309
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发表时间：
2023-04
影响因子：
4.4
通讯作者：
C. Unsworth;M. Austin;K. V. van Landeghem;A. Couldrey;R. Whitehouse;Ben Lincoln;Siobhan Doole;P. Worrall
中科院分区：
文献类型：
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作者：
C. Unsworth;M. Austin;K. V. van Landeghem;A. Couldrey;R. Whitehouse;Ben Lincoln;Siobhan Doole;P. Worrall
由于近海可再生能源的增长，世界浅大陆架目前正在经历快速发展。基础设施在海床上的安置可能改变海床的形态、海床上方水流的性质和沉积物的运输，从而使规划和设计近海可再生基础设施所需的海床稳定性评估复杂化。为了确定这些自然过程对电缆稳定性的影响有多大，我们提出了直接在一段海底电缆上进行的第一次现场观察，这些海底电缆来自东爱尔兰海当前和计划中的海上风电场位置的两个部署。在典型的高压电缆断面上测量了水流、紊流和悬沙浓度的剖面。部署后，我们的观察表明，沉积物沉积在电缆周围，并发生自埋。沉积速率在不同的调查取决于强迫和当地的床条件。随着埋深的增加，电缆本身产生的湍流减少，但床面切应力和悬沙浓度之间的关系并不一致的调查。我们讨论了几个过程可能负责沉积电缆周围的流行，和调查之间的海底流动性的差异。
The world's shallow continental shelves are currently experiencing a rapid pace of development from the growth of offshore renewable energy. The emplacement of infrastructure on the seabed can change the morphology of the bed, the nature of the flow above it the transport of sediment, and so complicate the assessment of seabed stability for planning and designing offshore renewable infrastructure. To ascertain how much of an impact these natural processes have on the stability of cables, we present the first field observations made directly over a section of subsea cable, from two deployments in the Eastern Irish Sea at a location of current and planned offshore windfarms. Profiles of flow, turbulence and suspended sediment concentration were measured over a section of typical high voltage electricity cable. Upon deployment our observations showed that sediment was deposited around the cable and self-burial occurred. The rate of deposition varied between surveys dependent on forcing and local bed conditions. Turbulence generated from the cable itself reduced as the embedment depth increased, but the relationship between bed shear stress and suspended sediment concentration was not consistent between surveys. We discuss several processes potentially responsible for the prevalence of deposition around the cable, and the difference in seabed mobility between the surveys.