Landslide Spreading, Impulse Water Waves and Modelling of the Vajont Rockslide
Landslide Spreading, Impulse Water Waves and Modelling of the Vajont Rockslide
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DOI：
10.1007/s00603-015-0769-z
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发表时间：
2016-06
影响因子：
6.2
通讯作者：
G. Crosta;S. Imposimato;D. Roddeman
中科院分区：
文献类型：
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作者：
G. Crosta;S. Imposimato;D. Roddeman
滑坡可能发生在不同的环境中，并可能与具有不同特征的水库或公海相互作用或落入其中。陆上演变和从陆上到水下的过渡条件可以强烈地控制滑坡的演变和产生的脉冲波，从而最终的危险区划。我们打算在不同的2D和3D条件和设置下对滑坡的扩展、对水面的影响以及冲击波的产生进行建模。我们验证了一个完整的二维和三维有限元ALE方法来建模和分析近场演化的能力。为了这个目的，我们验证代码对不同弗劳德数条件（Fr = 1.4，3.2）的2D实验室实验。在此基础上，对瓦洪滑坡（Fr = 0.26-0.75）及其产生的冲击波进行了二维和三维数值模拟。滑动体模拟为弹塑性莫尔-库仑材料，湖水模拟为完全无粘低压缩性流体。根据现场观测，包括总持续时间、最终存款的剖面和内部几何形状、相对山谷侧翼和岩滑体上的最大水上升，验证岩滑模型。二维模型的情况下，一个干谷和蓄水湖。这套全3D模拟是第一个可用的，并考虑了岩滑的演变，传播和与水库的相互作用。的建模方法的优点和缺点进行了讨论。
Landslides can occur in different environments and can interact with or fall into water reservoirs or open sea with different characteristics. The subaerial evolution and the transition from subaerial to subaqueous conditions can strongly control the landslide evolution and the generated impulse waves, and consequently the final hazard zonation. We intend to model the landslide spreading, the impact with the water surface and the generation of the impulse wave under different 2D and 3D conditions and settings. We verify the capabilities of a fully 2D and 3D FEM ALE approach to model and analyse near-field evolution. To this aim we validate the code against 2D laboratory experiments for different Froude number conditions (Fr = 1.4, 3.2). Then the Vajont rockslide (Fr = 0.26–0.75) and the consequent impulse wave are simulated in 2D and 3D. The sliding mass is simulated as an elasto-plastic Mohr–Coulomb material and the lake water as a fully inviscid low compressibility fluid. The rockslide model is validated against field observations, including the total duration, the profile and internal geometry of the final deposit, the maximum water run-up on the opposite valley flank and on the rockslide mass. 2D models are presented for both the case of a dry valley and that of the impounded lake. The set of fully 3D simulations are the first ones available and considering the rockslide evolution, propagation and interaction with the water reservoir. Advantages and disadvantages of the modelling approach are discussed.