On the effect of the water body geometry on landslide-tsunamis: Physical insight from laboratory tests and 2D to 3D wave parameter transformation
On the effect of the water body geometry on landslide-tsunamis: Physical insight from laboratory tests and 2D to 3D wave parameter transformation
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DOI：
10.1016/j.coastaleng.2015.06.006
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发表时间：
2015-10-01
影响因子：
4.4
通讯作者：
Spinneken, Johannes
中科院分区：
文献类型：
--
作者：
Heller, Valentin;Spinneken, Johannes
滑坡-海啸灾害的初步评估通常基于从波浪通道（2D）或波浪盆地（3D）实验中得出的经验公式。2D中的远场波可以很容易地比3D中的大一个数量级。本研究系统地研究了水体几何形状对近场和远场波浪特性的影响。水下滑坡海啸试验进行依赖于一个2D和3D物理模型，进行相同的边界条件。试验参数包括两个水深、三个刚性载玻片以及各种载玻片释放位置。三维海上和横向岸上波特性的经验方程，并与以前的工作进行了比较。波浪特征的直接比较表明，波浪在2D、3D陆上和3D海上衰减，具有chi（-0.30）、r（-0.67）和r（-1.0），其中x（2D）和r（3D）描述了与撞击区的距离。在2D中观察到四种波类型，而在3D中仅观察到两种最小的非线性类型。这一发现进一步分析了小波谱。对于较大的滑动弗劳德数F、相对滑动厚度S和相对滑动质量M，滑动冲击区的三维波高可以与二维波高一样大。然而，对于小的F、S和M，3D波在近场和远场都小得多。提出并验证了一种新的方法，将数据从2D研究转换为3D。该方法对滑坡海啸灾害的初步评估具有一定的指导意义。(C)2015 Elsevier B. V.版权所有。
Preliminary landslide-tsunami hazard assessment is commonly based on empirical equations derived from wave channel (2D) or wave basin (3D) experiments. The far-field wave in 2D can easily be an order of magnitude larger than in 3D. The present study systematically investigates the effect of the water body geometry on the wave characteristics in the near- and far-field. Subaerial landslide tsunami tests were conducted relying upon both a 2D and a 3D physical model, undertaken with identical boundary conditions. The test parameters included two water depths, three rigid slides, as well as various slide release positions. Empirical equations for 3D offshore and laterally onshore wave properties are presented and compared with previous work. A direct comparison of the wave features reveals that the waves decay in 2D, 3D onshore and 3D offshore with chi(-0.30), r(-0.67) and r(-1.0), where x (2D) and r (3D) describe the distance from the impact zone. In 2D four wave types are observed, whereas only the two least non-linear types were observed in 3D. This finding is further analysed with wavelet spectra. For a large slide Froude number F, relative slide thickness S and relative slide mass M, the 3D wave heights in the slide impact zone can be as large as in 2D. However, for small F,S and M, the 3D waves are considerably smaller both in the near- and far-field. A novel method is presented and validated to transform data from 2D studies to 3D. This method may have favourable implications on preliminary landslide tsunami hazard assessment. (C) 2015 Elsevier B.V. All rights reserved.