Developing a Moving Solid Algorithm to Study the Generation of Landslide Tsunamis and the Movement of Tsunami Boulders

• Main Authors: Shun-Kai Hu, 胡順凱
• Other Authors: Tso-Ren Wu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/s9nc67

碩士 === 國立中央大學 === 水文與海洋科學研究所 === 106 === 　　In June, 2017, a landslide-tsunami event took place at Karrat fjord, locating at the west coast of Greenland. The volume of the landslide is approximately 45 million cubic meter. As the result, the tsunami brought destructions and several casualties to a fishing village at Nuugaatsiaq. In order to investigate further physical properties of this event, we must not ignore the high nonlinearity of breaking waves induced by great vertical vibration. Therefore, a 3D numerical analysis is taken to obtain accurately reproduce the scenario. 　　Rigid-Fluid Method (RFM), which solves the Navier-Stokes equation for three-dimensional incompressible flow, is developed to calculate the movement and rotation of a moving solid. With the data of the pressure and shear stress in each grid collected by Discrete Element Method (DEM), the moving solid is granted to be involved in the simulation; while the free surface is reconstructed by Piecewise Linear Interface Calculation (PLIC). 　　A series of simulations and analyses of the Greenland Tsunami, the Jiu Peng tsunami boulders, and a hemisphere landslide tsunami experiment have been performed. The numerical results, which concur with the literature records, indicate the correctness of this method even a moving solid is included.