斜向波作用下斜坡海床上管线三维冲刷不均衡性研究

程永舟; 鲁显赫; 李小超; 易蕾; 胡有川

doi:10.3969/j.issn.0253-4193.2016.07.012

斜向波作用下斜坡海床上管线三维冲刷不均衡性研究

doi: 10.3969/j.issn.0253-4193.2016.07.012

1.
长沙理工大学水利工程学院, 湖南长沙 410004;水沙科学与水灾害防治湖南省重点实验室, 湖南长沙 410004
2.
长沙理工大学水利工程学院, 湖南长沙 410004

基金项目: 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)。

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出版历程
- 收稿日期: 2015-12-07

The malconformation research of 3D scour below submarine pipelines under the oblique waves

1.
School of Hydraulic Engineering, Changsha University of Science&Technology, Changsha 410004, China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410004, China
2.
School of Hydraulic Engineering, Changsha University of Science&Technology, Changsha 410004, China

摘要

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0.22 mm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。
- 海底管线 /
- 冲刷 /
- 斜坡海床 /
- 斜向波
Abstract:
Due to the seabed undulating, the slope changed the action properties of wave on pipeline and seabed necessarily and then will affect three-dimensional scouring below pipelines. For the experimental research of the three-dimensional scouring characteristics of submarine pipeline, a median particle size of 0.22 mm and the 45° angle of the slope are used by considering the effect of the oblique wave, which is based on the experimental results of the wave basins. The malconformation of pipelines three-dimensional scour is analyzed by measuring the width and depth of the scour hole in the pipeline. The experimental results show that the existence of pipeline makes the wave height on the slope to reduce; under the action of slope, the malconformation of the three-dimensional scouring characteristics of submarine pipelines is assumed by the malconformation of the depth and width, and the malconformation of the width is responsible for the sediment behind the pipeline is moved backwards. The influence of the malconformation of three-dimensional scour of the cycle is higher than the wave height. With the decrease of the water depth, scour depth is divided into slow development stage and rapid development phase when the pipelines extend from the deep sea to the seacoast.
- submarine pipeline /
- scour /
- slope seabed /
- oblique wave

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