Dynamic response of submarine obstacles to two-phase landslide and tsunami impact on reservoirs
Dynamic response of submarine obstacles to two-phase landslide and tsunami impact on reservoirs
复制标题
DOI：
10.1007/s00707-019-02457-0
复制
发表时间：
2019-07
期刊：
影响因子：
2.7
通讯作者：
J. Kafle;Parameshwari Kattel;M. Mergili;J. Fischer;S. Pudasaini
中科院分区：
文献类型：
--
作者：
J. Kafle;Parameshwari Kattel;M. Mergili;J. Fischer;S. Pudasaini
海底滑坡与海洋、高山湖泊或水库等水体相互作用时可能会引发超级海啸。这些水体可能含有固体物体（障碍物），它们会极大地改变质量流动力学并减少海底滑坡和海啸的破坏性影响。海底滑坡、相关的海啸及其与障碍物的相互作用比空中滑坡及其障碍物的相互作用更为复杂。为了减轻山区和沿海灾害并保持水库的完整性，正确了解海底滑坡和海啸与障碍物的相互作用非常重要。现有方法无法考虑混合物流中界面动量传递的其他重要方面，例如界面阻力、浮力、颗粒表面流体的流动性和虚拟质量力，这些方面在通过滑坡体与水之间的动态相互作用更准确地预测混合物流动力学方面发挥着重要作用。为了包含两相质量流的这些重要物理现象，特别是包含滑坡质量和水之间的动态相互作用，我们应用了通用的两相质量流模型（Pudasaini in J Geophysical Res 117:F03010, 2012。https://doi.org/10.1029/2011JF002186）并提出了两相滑坡的高分辨率新颖模拟结果 影响储液器。我们的模拟表明，强烈的流动障碍物相互作用极大地降低了流动动量，导致障碍物周围的能量快速耗散。随着障碍物高度的增加，越顶现象减少，但固体质量的偏转和捕获（保持）增加。由于存在多个障碍物，移动质量的数量和速度都会下降，显示出指法和蜿蜒的多个流波瓣。障碍物的不同位置会改变偏转模式、质量保持以及海啸强度和流动性。我们的模拟和发现丰富了我们对相之间的混合和分离、特殊固体和流体结构的生成和传播以及流动过程中的转变的理解，这可能为沿海地区的减灾奠定基础。
Submarine landslides may generate super-tsunamis as they interact with water bodies such as oceans, mountain lakes or reservoirs. These water bodies may contain solid objects (obstacles), which substantially alter the mass flow dynamics and reduce the devastating effects of submarine landslide and tsunami. Submarine landslides, the related tsunamis, and their interactions with obstacles are more complex than subaerial landslides and their obstacle-interactions. In order to mitigate mountain and coastal hazards and maintain the integrity of a hydraulic reservoir, it is important to properly understand submarine landslide and tsunami interactions with obstacles. Existing approaches cannot take into account other important aspects of interfacial momentum transfer in mixture flows such as interfacial drag, buoyancy, mobility of the fluid at the particle surface, and virtual mass force, which play important roles in the more accurate prediction of mixture flow dynamics by dynamic interactions between the landslide mass and the water. In order to include these important physics of two-phase mass flows and especially to include dynamic interactions between the landslide mass and the water, we apply a general two-phase mass flow model (Pudasaini in J Geophysics Res 117:F03010, 2012. https://doi.org/10.1029/2011JF002186 ) and present high-resolution novel simulation results for a two-phase landslide impacting a fluid reservoir. Our simulations demonstrate that the intense flow-obstacle-interaction dramatically reduces the flow momentum resulting in the rapid energy dissipation around the obstacles. With the increase in obstacle height, overtopping decreases, but the deflection and capturing (holding) of solid mass increases. Due to multiple obstacles, the moving mass decreases both in amount and speed showing fingering and meandering multiple streamed lobes. The varying location of the obstacles changes the deflection pattern, holding of mass, and tsunami intensity and mobility. Our simulations and findings enrich our understanding of mixing and separation between phases, generation and propagation of special solid and fluid structures, and transitions during the flow process, that may form a basis for the hazard mitigation in coastal regions.