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首页> 外文期刊>Coastal engineering >Predictions of the equilibrium depth and time scale of local scour below a partially buried pipeline under oblique currents and waves
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Predictions of the equilibrium depth and time scale of local scour below a partially buried pipeline under oblique currents and waves

机译：斜流和斜波作用下部分埋设管道下方局部冲刷的平衡深度和时间尺度的预测

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摘要

This paper presents experimental results on temporal developments of local scour below a partially buried pipeline under oblique currents/waves. The effects of the flow incident angle (alpha = 45 degrees, alpha = 0 degrees denotes that the currents/waves are perpendicular to the pipeline) and the embedment-to-diameter ratio (e/D = 0.5, e/D = 0 denotes no embedment) on the equilibrium depth and time scale of scour were quantitatively investigated. The experimental results indicate that with the increase of the embedment-to-diameter ratio from 0 to 0.5, the equilibrium depth of scour decreases by up to 30 and the time scale increases by approximately 5 times. With the increase of the flow incident angle from 0 degrees to 45 degrees, the equilibrium depth decreases by approximately 25% and the time scale increases by approximately 0.7 times. A uniform empirical relationship between the equilibrium depth for arbitrary conditions (S, i.e., for a 0 degrees or e/D 0) and that for a conventional case (S-0, for alpha = 0 degrees and e/D = 0) is newly proposed for both current and wave conditions based on theoretical derivation and curve fitting to the experimental data, where S-0 can be easily predicted from existing empirical formulae. The correlation analysis indicates that the experimental results of the equilibrium depth can be well represented by the newly proposed formula. For predicting the time scale of scour process, a theoretical approach based on the erosion rate of sediment, which was originally proposed for a conventional case, is expanded to arbitrary conditions. It is indicated that the time scales of scour obtained from the theoretical approach are well coincident with the experimental values. Finally, an empirical relationship between the time scale for arbitrary conditions (T) and that for a conventional case (T-0) was established based on the theoretical derivation. The newly proposed empirical formula is found to provide satisfactory predictions of the time scale compared with the present experimental results and those published.
机译：本文介绍了在斜流/斜波作用下局部埋设的管道下方局部冲刷随时间变化的实验结果。流动入射角（α<= 45度，α= 0度表示电流/波垂直于管道）和埋入直径比（e / D <= 0.5，e / D = 0表示没有嵌入）在冲刷的平衡深度和时间尺度上进行了定量研究。实验结果表明，随着嵌入直径的比率从0增加到0.5，冲刷的平衡深度减小了30倍，时间尺度增加了大约5倍。随着流体入射角从0度增加到45度，平衡深度减少了大约25％，时间尺度增加了大约0.7倍。任意条件（S，即> 0度或e / D> 0）的平衡深度与常规情况（S-0，α= 0度且e / D = 0）之间的平衡深度之间的经验关系一致）是根据理论推导和对实验数据的曲线拟合而针对电流和波浪条件新提出的，其中可以根据现有经验公式轻松预测S-0。相关分析表明，新提出的公式可以很好地表示平衡深度的实验结果。为了预测冲刷过程的时间尺度，最初针对常规情况提出的基于沉积物侵蚀速率的理论方法已扩展到任意条件。结果表明，理论方法得到的冲刷时间尺度与实验值吻合较好。最后，基于理论推导，建立了任意条件下的时间尺度（T）和常规情况下的时间尺度（T-0）的经验关系。与当前的实验结果和已发表的实验结果相比，发现新提出的经验公式可以提供令人满意的时间尺度预测。

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  • 来源
    《Coastal engineering》 |2019年第8期|94-107|共14页
  • 作者

    Zang Zhipeng; Tang Guoqiang; Chen Yanfei; Cheng Liang; Zhang Jinfeng;

  • 作者单位

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China|Shanghai Jiao Tong Univ, Collaborat Innovat Ctr Adv Ship & Deep Sea Explor, Shanghai 200240, Peoples R China;

    Dalian Univ Technol, Stake Key Lab Coastal & Offshore Engn, Dalian 160023, Peoples R China;

    China Univ Petr, Beijing Key Lab Urban Oil & Gas Distribut Technol, Natl Engn Lab Pipeline Safety, Beijing 102249, Peoples R China;

    Dalian Univ Technol, Stake Key Lab Coastal & Offshore Engn, Dalian 160023, Peoples R China;

    Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Equilibrium depth; Time scale; Flow incident angle; Embedment depth; Experiments; Theoretical approach; Empirical formulae;

    机译：平衡深度;时间尺度;水流入射角;埋深;实验;理论方法;经验公式;

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