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Applicability of tracking simulations for probabilistic assessment of floating debris collision in tsunami inundation flow
Coastal Engineering Journal ( IF 2.4 ) Pub Date : 2019-12-25 , DOI: 10.1080/21664250.2019.1706221 Naoto Kihara 1 , Hideki Kaida 1
Coastal Engineering Journal ( IF 2.4 ) Pub Date : 2019-12-25 , DOI: 10.1080/21664250.2019.1706221 Naoto Kihara 1 , Hideki Kaida 1
Affiliation
ABSTRACT To improve the applicability of numerical simulations in tracking debris motion for probabilistic assessments of debris collisions with buildings and components installed in coastal industrial sites at a local scale (O (1 km)), the applicability of the numerical approach is investigated through numerical simulations of laboratory experiments. Two characteristic phenomena are found that cannot be expressed by the numerical simulations. The first characteristic phenomenon is debris motion approaching a building model in a reflected wave. To simulate this phenomenon, the incorporation of a turbulent bore model into the numerical model is proposed. The second characteristic phenomenon is debris diffusion due to various perturbations. For simulation of this phenomenon, two approaches are proposed. In the first approach, some causes of debris diffusions are separately modeled. In the second approach, diffusions due to various perturbations are simulated by artificially intensifying debris diffusions. By investigating impacts of the two approaches on probabilistic assessments of debris collision, it is found that debris spreads and the exceedance probabilities of collision speed can be predicted well by considering epistemic uncertainties in determination of diffusion intensity by the latter approach.
中文翻译:
跟踪模拟对海啸淹没流中漂浮物碰撞概率评估的适用性
摘要 为了提高数值模拟在跟踪碎片运动方面的适用性,以对局部尺度(O(1 公里))安装在沿海工业场所的建筑物和组件进行碎片碰撞的概率评估,通过数值模拟研究了数值方法的适用性的实验室实验。发现了数值模拟无法表达的两个特征现象。第一个特征现象是碎片运动在反射波中接近建筑模型。为了模拟这种现象,建议将湍流孔模型结合到数值模型中。第二个特征现象是由于各种扰动引起的碎片扩散。为了模拟这种现象,提出了两种方法。在第一种方法中,碎片扩散的一些原因是单独建模的。在第二种方法中,由于各种扰动引起的扩散是通过人为加强碎片扩散来模拟的。通过研究两种方法对碎片碰撞概率评估的影响,发现后一种方法在确定扩散强度时考虑了认知不确定性,可以很好地预测碎片扩散和碰撞速度的超过概率。
更新日期:2019-12-25
中文翻译:
跟踪模拟对海啸淹没流中漂浮物碰撞概率评估的适用性
摘要 为了提高数值模拟在跟踪碎片运动方面的适用性,以对局部尺度(O(1 公里))安装在沿海工业场所的建筑物和组件进行碎片碰撞的概率评估,通过数值模拟研究了数值方法的适用性的实验室实验。发现了数值模拟无法表达的两个特征现象。第一个特征现象是碎片运动在反射波中接近建筑模型。为了模拟这种现象,建议将湍流孔模型结合到数值模型中。第二个特征现象是由于各种扰动引起的碎片扩散。为了模拟这种现象,提出了两种方法。在第一种方法中,碎片扩散的一些原因是单独建模的。在第二种方法中,由于各种扰动引起的扩散是通过人为加强碎片扩散来模拟的。通过研究两种方法对碎片碰撞概率评估的影响,发现后一种方法在确定扩散强度时考虑了认知不确定性,可以很好地预测碎片扩散和碰撞速度的超过概率。