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Runup and rundown generated by three-dimensional sliding masses

Liu, P. L.-F. and Wu, T.-R. and Raichlen, F. and Synolakis, C. E. and Borrero, J. C. (2005) Runup and rundown generated by three-dimensional sliding masses. Journal of Fluid Mechanics, 536 (1). pp. 107-144. ISSN 0022-1120. doi:10.1017/S0022112005004799.

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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 104m long, 3.7m wide and 4.6m 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.

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Additional Information:"Reprinted with the permission of Cambridge University Press." Received 11 May 2004 and in revised form December 13, 2004 This work was supported by the Geohazards Mitigation Program of the National Science Foundation through grants to the authors. P.L.F.L. would also like to acknowledge the support from the Fluid Dynamics and Hydraulics Program and the Physical Oceanography Program of the National Science Foundation. C. E. S. would like to thank Burak Uslu and Christophe Gaudiot for their help with the experiments.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
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Deposited On:10 Oct 2005
Last Modified:08 Nov 2021 19:05

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