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Glacial ice impacts: Part Ⅰ: Wave-driven motion and small glacial ice feature impacts

机译：冰川冰撞击：第Ⅰ部分：波浪驱动运动和小冰川冰功能影响

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摘要

Glacial ice features in the northern and central Barents Sea may threaten ships and offshore structures. Particularly, small glacial ice features, which are difficult to detect and manage by concurrent technologies, are of concern. Additionally, small glacial ice features are more susceptible to wave-driven oscillatory motions, which increases their pre-impact kinetic energy and may damage ships and offshore structures. This paper is part of three related papers. An initial paper (Monteban et al., 2020) studied glacial ice features' drift, size distribution and encounter frequencies with an offshore structure in the Barents Sea. The following two papers (Paper I and Paper II) further performed glacial ice impact studies, including impact motion analysis (Paper I) and structural damage assessment (Paper II). This paper (Paper I) studies the wave-driven motion of small glacial ice features and their subsequent impact with a given offshore structure. The aim here is to develop a numerical model that is capable of efficiently calculating the relative motion between the ice feature and structure and to sample a sufficient amount of impact events from which statistical information can be obtained. The statistical information entails the distributions of the impact location and associated impact velocities. Given the distributions of the impact velocities at different locations, we can quantify the kinetic energy for related impact scenarios for a further structural damage assessment in Paper II (Yu et al., 2020).In Paper I, a numerical model that separately calculates the wave-driven oscillatory motion and the mean drift motion of small glacial ice features is proposed, implemented and validated. Practical and fit-for-purpose hydrodynamic simplifications are made to simulate and sample sufficient impact events. The numerical model has been favourably validated against existing numerical results and experimental data. A case study is presented where a 10 m wide glacial ice feature is drifting under the influence of surface waves towards an offshore structure. The case study shows that if an impact happens, the overall impact location and impact velocity can be best fitted by the Normal and Weibull distributions, respectively. Additionally, the impact velocity increases with impact height. Moreover, the impact velocity increases and the impact range is more dispersed in a higher sea state. It is also important to notice that the approaches and methods proposed in this paper adhere to and reflect the general requirements stated in ISO19906(2019) and NORSOK N-003 (2017) for estimating the design kinetic energy for glacial ice impacts.
机译：北部和中央小理海线的冰川冰功能可能会威胁船舶和海上结构。特别是小冰川冰功能，难以通过并发技术检测和管理，这是令人担忧的。另外，小冰川冰具有更容易受到波浪驱动的振荡运动的影响，这增加了它们的预冲击动能，并且可能会损坏船舶和海上结构。本文是三篇相关论文的一部分。初始纸张（Monteban等，2020）研究了冰川冰功能的漂移，尺寸分布和遇到诸如牧人海域的近海结构。以下两篇论文（纸张I和纸张II）进一步表现了冰川冰冲击研究，包括影响运动分析（纸张I）和结构损伤评估（纸张II）。本文（纸张I）研究小冰川冰特征的波浪驱动，以及与给定的海上结构的后续冲击。这里的目的是开发一种数值模型，其能够有效地计算冰特征和结构之间的相对运动，并采样足够量的可以获得统计信息的冲击事件。统计信息需要撞击位置和相关的冲击速度的分布。鉴于不同地点的冲击速度的分布，我们可以量化相关影响情景的动能，以便在纸上的进一步结构损伤评估（Yu等，2020）。在纸张I，一个单独计算的数值模型提出，实施和验证了波驱动振荡运动和小冰川冰特征的平均漂移运动。采用实用和适合的流体动力学简化，模拟和样本充分的影响事件。数值模型已经有利地验证了现有数值结果和实验数据。介绍了一个案例研究，其中10米宽的冰川冰功能在表面波朝向海上结构的影响下漂移。案例研究表明，如果发生冲击，则分别可以通过正常和Weibull分布最适合整体冲击位置和冲击速度。另外，冲击速度随冲击高度而增加。此外，冲击速度增加，冲击范围更高的海水位。本文提出的方法和方法还坚持并反映了ISO19906（2019）和Norsok N-003（2017）中所述的一般要求，用于估算用于冰川冰撞击的设计动能。

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  • 来源
    《Marine Structures》 |2021年第1期|102850.1-102850.24|共24页
  • 作者

    Lu Wenjun; Amdahl Jorgen; Lubbad Raed; Yu Zhaolong; Loset Sveinung;

  • 作者单位

    ArcISo AS Trondheim Norway|Norwegian Univ Sci & Technol NTNU Sustainable Arctic Marine & Coastal Technol SAMCo Trondheim Norway|Norwegian Acad Sci & Letters DNVA Oslo Norway;

    Norwegian Univ Sci & Technol NTNU Dept Marine Technol Trondheim Norway|Norwegian Univ Sci & Technol NTNU Ctr Autonomous Marine Operat & Syst AMOS Trondheim Norway;

    ArcISo AS Trondheim Norway|Norwegian Univ Sci & Technol NTNU Sustainable Arctic Marine & Coastal Technol SAMCo Trondheim Norway;

    Norwegian Univ Sci & Technol NTNU Dept Marine Technol Trondheim Norway|Norwegian Univ Sci & Technol NTNU Ctr Autonomous Marine Operat & Syst AMOS Trondheim Norway;

    ArcISo AS Trondheim Norway|Norwegian Univ Sci & Technol NTNU Sustainable Arctic Marine & Coastal Technol SAMCo Trondheim Norway;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Glacial ice; Impacts; Wave driven motion; Froude-krylov force; Nonlinear hydrodynamic effects;

    机译：冰川冰;影响;波浪驱动运动;Froude-Krylov力;非线性流体动力学效应;

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