埋深海缆的冲刷机理及防护措施

Scouring Mechanism and Protective Measures of Submarine Cable

基于数值仿真的方法,得到海缆冲刷发展的3个阶段:泥沙沿水流方向往海缆后方输移;海缆出现部分裸露,局部流速增大,冲刷加剧;海缆后方形成涡流,进一步加速掏空海缆后方、下方泥沙。针对埋深海缆冲刷的机理,研发一种新型海缆保护装置。数值模拟和现场试验结果显示,该冲刷防护装置性能良好,阻流效果达75%,并且具有明显的促淤效果。

Based on numerical simulation,three stages of the submarine cable scouring development are obtained:the sediment is transported behind the submarine cable along the current direction;some of the submarine cables are exposed,the local velocity increases and the scouring intensifies;the eddy current forms behind the submarine cable which further accelerates the excavation of sediment behind and below the submarine cable.Aimed at the scouring mechanism,a new type of cable protection device is developed.The results of numerical simulation and field test show that the scouring prevention device is of good performance,the current blocking effect reaches 75%,and obvious siltation promoting effect is provided.