Runup and rundown generated by three-dimensional sliding masses
Runup and rundown generated by three-dimensional sliding masses
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DOI：
10.1017/s0022112005004799
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发表时间：
2005-08-10
影响因子：
3.7
通讯作者：
Borrero, JC
中科院分区：
文献类型：
--
作者：
Liu, PLF;Wu, TR;Borrero, JC
为了研究滑体产生的波浪和升/降，建立了基于大涡模拟（LES）方法的数值模拟模型。采用Smagorinsky亚网格模型提供湍流耗散，采用VOF方法跟踪自由表面和海岸线运动。为了验证数值模型的正确性，在长104 m、宽3.7 m、深4.6 m的波浪水槽中进行了一系列大尺度试验，水槽的一端设置有1：2的平面斜坡。用一个具有两个方向和一个半球的自由滑动的楔形体来代表滑坡。它们的初始位置从完全悬空到完全淹没，滑体也在很大范围内变化。载玻片上装有仪器，以提供位置和速度的时间历程。对不同位置的水面和爬高进行了测量，并将数值计算结果与试验结果进行了比较。非常好的协议示出的时间历程的助跑和生成的波。数值结果进一步显示了三维复杂流态、自由面和岸线变形的细节。最大助跑高度作为初始高程和滑道比重的函数。最后讨论了水池宽度对最大爬高的影响。
To study the waves and runup/rundown generated by a sliding mass, a numerical simulation model, based on the large-eddy-simulation (LES) approach, was developed. The Smagorinsky subgrid scale model was employed to provide turbulence dissipation and the volume of fluid (VOF) method was used to track the free surface and shoreline movements. A numerical algorithm for describing the motion of the sliding mass was also implemented.To validate the numerical model, we conducted a set of large-scale experiments in a wave tank of 104 m long, 3.7 m wide and 4.6 m deep with a plane slope (1 :2) located at one end of the tank. A freely sliding wedge with two orientations and a hemisphere were used to represent landslides. Their initial positions ranged from totally aerial to fully submerged, and the slide mass was also varied over a wide range. The slides were instrumented to provide position and velocity time histories. The time-histories of water surface and the runup at a number of locations were measured.Comparisons between the numerical results and experimental data are presented only for wedge shape slides. Very good agreement is shown for the time histories of runup and generated waves. The detailed three-dimensional complex flow patterns, free surface and shoreline deformations are further illustrated by the numerical results. The maximum runup heights are presented as a function of the initial elevation and the specific weight of the slide. The effects of the wave tank width on the maximum runup are also discussed.