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首页> 外文期刊>Computers & geosciences >Numerical assessment of boulder transport by the 2004 Indian ocean tsunami in Lhok Nga, West Banda Aceh (Sumatra, Indonesia)
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Numerical assessment of boulder transport by the 2004 Indian ocean tsunami in Lhok Nga, West Banda Aceh (Sumatra, Indonesia)

机译：2004年印度洋海啸在西班达亚齐（印度尼西亚苏门答腊）乐克雅（Lhok Nga）进行的巨石运输的数值评估

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摘要

Few studies have been conducted on modeling boulder transport by tsunamis despite considerable research on the analysis of boulder deposits. A detailed description of the derivation of governing equations for boulder transport in submerged, partially submerged, and subaerial (not in contact with fluid) is presented, and then a numerical model is proposed to solve the governing equations in one dimension. Subsequently, the model is used to analyze the transport of calcareous boulders detached from a seawall in Lhok Nga (northwestern Sumatra, Indonesia) by the 2004 Indian Ocean tsunami. A few simulated transport distances match field observations, but the others are higher than the field measurements. Clast-to-clast interactions at the inception of transport would have a major impact on changes in transport distance, dissipating the energy in impulses as destruction of the seawall releases different sizes of boulders with different velocities. Moreover, surface microtopographical effects could completely stop the transport prematurely. The difference between the simulated results and the field observations is partly attributed to limitations of the numerical model. No landward fining was observed in the field measurements, but numerically predicted results showed a reasonable trend of landward fining.
机译：尽管对石块沉积物的分析有大量研究，但很少有研究对海啸巨石运输进行建模。给出了对在淹没，部分淹没和空中（不与流体接触）的巨石运输控制方程的推导的详细描述，然后提出了一个数值模型来求解一维控制方程。随后，该模型用于分析2004年印度洋海啸使Lhok Nga（印度尼西亚苏门答腊西北部）海堤脱离的钙质巨石的运输。一些模拟的运输距离与现场观测值相符，但其他一些比现场测量值高。运输开始时的碎屑间相互作用将对运输距离的变化产生重大影响，随着海堤的破坏释放出具有不同速度的不同大小的巨石，从而以脉冲形式耗散能量。此外，表面微形貌效应可能会完全阻止运输。模拟结果与现场观测结果之间的差异部分归因于数值模型的局限性。在野外测量中未观察到陆上精细化，但数值预测结果显示了陆上精细化的合理趋势。

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  • 来源
    《Computers & geosciences》 |2011年第9期|p.1391-1399|共9页
  • 作者

    N.A.K. Nandasena; Raphaeel Paris; Norio Tanaka;

  • 作者单位

    Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan;

    Clermont Universite, 63000 Clermont-Ferrand, France,CNRS. CEOLAB, 63057 Clermont-Ferrand, France;

    Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan,Institute for Environmental Science and Technology, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan,Saitama University, Graduate School of Science and Engineering, 255 Shimo-okubo, Sakura-ku. Saitama 338-8570, Japan;

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

    Cosimulation; FFT-MA; Parameterization; Inverse modeling; Perturbation; Gradual deformation;

    机译：协同仿真FFT-MA;参数化;逆向建模;摄动;逐渐变形;

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