Tsunamis induced by the landslide will divide into a traveling wave component propagating along the coastline and an offshore wave component propagating perpendicular to the coastline. The offshore tsunami wave has the non-negligible energy and destruction in enclosed basins as fjords, reservoirs, and lakes, which are worth studying. The initial submergence condition, the falling height and sliding angle of slider, are important reference indexes of damage degree of landslide and may also matter at that of the landslide-induced tsunami. Depending on the fully coupled model, the effects of them on the production and propagation of the tsunami were considered in the study. Since the slider used was semi-elliptic, the effect of the ratio of the long axis to the short axis was also analyzed. According to the computational fluid dynamics theory, a numerical wave tank was developed by the immersed boundary (IB) method; besides, the general moving-object module of slide mass was also embedded to the numerical tanker. The results indicate that the effects of the squeezing and pushing of the slider on water produce a naturally attenuated wave at the front of the wave train, and the attenuation becomes more serious with the increase in the initial submersion range of the slider. The effects of the vertical movement of the slider cause the increase in the amplitude of the back of the wave train. As the falling height increases, the large wave height increases when the slider is initially submerged and decreases when it is not initially submerged, except for the accidental elevation of that at smaller falling heights. The results also indicate that the hazard of the subaerial landslide-induced tsunami is greater under a small or large falling angle, and that of the partial subaerial and submarine landslide-induced tsunami is greater under a small falling angle. With the increase in the ratio of the long axis to the short axis, the total induced wave energy decreases and the shape of the wave train proportionally reduces, while the wave propagation mode does not change.

中文翻译：

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滑坡作用下海啸海浪产生和传播特征的数值研究

由滑坡引起的海啸将分为沿海岸线传播的行波分量和垂直于海岸线传播的近海波分量。离岸海啸波在海湾，水库和湖泊等封闭盆地中具有不可忽视的能量和破坏作用，值得研究。初始淹没条件，滑块的下降高度和滑移角是滑坡破坏程度的重要参考指标，并且也可能与滑坡引发的海啸有关。根据完全耦合的模型，研究中考虑了它们对海啸生产和传播的影响。由于使用的滑块是半椭圆形的，因此还分析了长轴与短轴之比的影响。根据计算流体动力学理论，通过浸没边界（IB）方法开发了一个数值波箱。此外，一般的滑动质量运动对象模块也被嵌入到数值油轮中。结果表明，滑块对水的挤压和推动作用会在波列的前端产生自然衰减的波，并且随着滑块初始浸没范围的增加，衰减会变得更加严重。滑块垂直运动的影响导致波列背面振幅的增加。随着下降高度的增加，当滑块最初被淹没时，大浪高会增加，而当滑块最初未被淹没时，大浪高会降低，但意外的是，在较小的下降高度处意外地将其抬高。结果还表明，在较小或较大的倾角下，海底滑坡诱发的海啸的危害较大；在较小的倾角下，局部海底和海底滑坡诱发的海啸的危害较大。随着长轴与短轴之比的增加，总的感应波能量减小，并且波列的形状成比例地减小，而波传播模式不变。