Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents
Peng Yu, Ruigeng Hu, Jike Zhang, Qi Yang, Jieru Zhao, Lei Cao, Chenghao Zhu
海底管道由于其可靠性和经济性较高，被广泛的应用到了海洋油气资源工程中。然而，在波浪、水流、海床以及管道结构之间的相互作用下，海底管道周边土体容易发生局部冲刷现象，这对管道的安全运行构成了严重威胁。本研究聚焦于黄河三角洲这一特殊区域，针对粉砂质海床环境下海底管道的局部冲刷问题展开了深入探讨。研究成果为该区域海底管道的防护提供参考。
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Peng Yu, Ruigeng Hu, Jike Zhang, Qi Yang, Jieru Zhao, Lei Cao, Chenghao Zhu. Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents. Deep Underground Science and Engineering. 2024; 3(2): 182-196. doi:10.1002/dug2.12068
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本文简介：
海底管道由于其可靠性和经济性较高，被广泛的应用到了海洋油气资源工程中。在波浪、水流、 海床及管道结构的相互作用下，海底管道周围的土体易发生局部冲刷，严重影响其运行安全。本文以黄河三角洲为研究区域，基于RNG k-w 湍流模型和Stokes五阶波理论，通过有限差分法求解 Navier- Stokes（N-S）方程，采用 VOF 方法描述流体自由面，建立了基于原型的波流-海底管道-粉砂质海床三维数值模型。通过自行建造的波流水槽中对数值模型进行了合理性验证。探究了在原型环境中黄河三角洲粉砂质海床海底管道的局部冲刷发展演化规律及冲刷特征，同时分析管道存在对周围流场、切应力、湍流强度等水动力特征的影响。研究结果表明：（1）海底管道周围的局部冲刷分为快速冲刷、慢速冲刷和冲刷稳定三个阶段，最大冲刷深度出现在管道正下方位置，冲刷坑的形态呈不对称。（2）随着水深的减小和管道悬空高度的增大，冲刷变得更强烈。（3）水流流经管道时会在管道前方形成明显的驻点，流速越大，则冲刷深度越大。本文研究成果可以为该区域海底管道的防护提供参考。
Brief Introduction：
Due to their high reliability and cost‐efficiency, submarine pipelines are widely used in offshore oil and gas resource engineering. Due to the interaction of waves, currents, seabed, and pipeline structures, the soil around submarine pipelines is prone to local scour, severely affecting their operational safety. With the Yellow River Delta as the research area and based on the renormalized group (RNG) k‐ε turbulence model and Stokes fifth‐order wave theory, this study solves the Navier–Stokes (N–S) equation using the finite difference method. The volume of fluid (VOF) method is used to describe the fluid‐free surface, and a three‐dimensional numerical model of currents and waves–submarine pipeline–silty sandy seabed is established. The rationality of the numerical model is verified using a self‐built waveflow flume. On this basis, in this study, the local scour development and characteristics of submarine pipelines in the Yellow River Delta silty sandy seabed in the prototype environment are explored and the influence of the presence of pipelines on hydrodynamic features such as surrounding flow field, shear stress, and turbulence intensity is analyzed. The results indicate that (1) local scour around submarine pipelines can be divided into three stages: rapid scour, slow scour, and stable scour. The maximum scour depth occurs directly below the pipeline, and the shape of the scour pits is asymmetric. (2) As the water depth decreases and the pipeline suspension height increases, the scour becomes more intense. (3) When currents go through a pipeline, a clear stagnation point is formed in front of the pipeline, and the flow velocity is positively correlated with the depth of scour.
02
本文亮点：
文章介绍了一种基于RNG k-w 湍流模型和Stokes五阶波理论的海底管道建模方法，建立了波流-海底管道-粉砂质海床三维数值模型，分析了海底管道周围局部特征，旨在为黄河三角洲地区海底管道的防护提供参考。
Highlights：
This paper introduces a modeling method of submarine pipeline based on RNG k‐ε turbulence model and Stokes' fifth order wave theory, establishes a three-dimensional numerical model of wave current-submarine pipeline-silty seabed, analyzes the local characteristics around the submarine pipeline, and aims to provide a reference for the protection of submarine pipeline in the Yellow River Delta.
03
第一作者简介：
于鹏
于鹏，高级工程师，博士。于2021年6月获得中国海洋大学环境地质工程博士学位。从事海洋岩土工程，地下空间评价，地质灾害防治等方向研究。在Science of the Total Environment、Journal of Cleaner Production、Ocean Engineering等期刊发表论文32篇（第一/通讯20篇）。被聘为中国矿业大学校外硕导，Deep Underground Science and Engineering青年编委、《华东地质》青年编委，获评山东省自然资源厅青年拔尖人才。
通讯作者简介：
朱成浩
朱成浩，中国海洋大学环境科学与工程学院博士研究生，从事海洋岩土工程相关研究。在Cold Regions Science and Technology发表研究论文1篇，在Ocean Engineering发表研究论文2篇，在《长江科学院院报》发表研究论文1篇，授权专利2项。
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