斜向波作用下斜坡海床上管线三维冲刷不均衡性研究

发布时间：2018-02-16 22:21

本文关键词： 海底管线冲刷斜坡海床斜向波　出处：《海洋学报》2016年07期 　论文类型：期刊论文

【摘要】：由于海床起伏不平,斜坡的存在必然改变波浪对管线及海床的作用特性,进而影响管线三维冲刷。基于波浪港池实验,考虑规则波的作用,采用中值粒径为0.22mm的原型沙铺设与波浪传播方向成45°夹角的斜坡,研究斜向波作用下斜坡上海底管线的三维冲刷特性。通过测量管线下方冲刷坑宽度和深度的差异,分析管线三维冲刷的不均衡性。实验表明:管线的存在使斜坡上的波高有所降低;斜向波作用下管线三维冲刷的不均衡性表现为深度不均衡性和宽度不均衡性,宽度不均衡性主要是管后淤积泥沙的后移引起的,周期对三维冲刷不均衡性的影响比波高对其的影响程度大;管线自深海向近岸延展时,随水深的减小,冲刷深度分为缓慢发展阶段和快速发展阶段。
[Abstract]:Because of the undulation of the seabed, the existence of the slope will inevitably change the action characteristics of the wave on the pipeline and seabed, and then affect the three-dimensional scour of the pipeline. Based on the wave pool experiment, the effect of the regular wave is considered. The 3-D scour characteristics of submarine pipelines on a slope with a median diameter of 0.22 mm and a 45 掳angle of wave propagation direction are studied. The differences in width and depth of scour pits beneath the slope are measured. The experiment shows that the wave height on the slope is decreased due to the existence of pipeline, and that the depth and width of the three dimensional scour are not balanced under the action of oblique wave. The unbalance of width is mainly caused by the backward movement of silt in the back of the pipe, and the effect of the period on the three-dimensional scour is greater than that of the wave height, and when the pipeline extends from the deep sea to the near shore, it decreases with the depth of water. Scour depth is divided into slow development stage and rapid development stage.
【作者单位】：长沙理工大学水利工程学院;水沙科学与水灾害防治湖南省重点实验室;
【基金】：国家自然科学基金资助项目(41176072,51309038) 湖南省自然科学基金项目(2015JJ2006)
【分类号】：P756.2;P731.2

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