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Ocean Engineering

Numerical Simulation of Surface Waves Generated by a Subaerial Landslide at Lituya Bay Alaska

[+] Author and Article Information
Debashis Basu, Kaushik Das, Steve Green, Ron Janetzke

 Southwest Research Institute® , 6220 Culebra Road, San Antonio, TX 78238

John Stamatakos

Southwest Research Institute® , Washington Technical Support Office, 1801 Rockville Pike, No. 105, 12300 Twinbrook Parkway, Rockville, MD 20852-1633

J. Offshore Mech. Arct. Eng 132(4), 041101 (Jul 23, 2010) (11 pages) doi:10.1115/1.4001442 History: Received July 27, 2009; Revised December 21, 2009; Published July 23, 2010; Online July 23, 2010

This paper presents simulated results of a computational study conducted to analyze the impulse waves generated by the subaerial landslide at Lituya Bay, Alaska. The volume of fluid method is used to track the free surface and shoreline movements. The renormalization group turbulence model and detached eddy simulation multiscale model were used to simulate turbulence dissipation. The subaerial landslide is simulated using a sliding mass. Results from the two-dimensional simulations are compared with the results from a scaled-down experiment. The experiment is carried out at a 1:675 scale. In the experimental setup, the subaerial rockslide impact into the Gilbert Inlet, wave generation, propagation, and runup on the headland slope is considered in a geometrically undistorted Froude similarity model. The rockslide is simulated by a granular material driven by a pneumatic acceleration mechanism so that the impact characteristics can be controlled. Simulations are performed for different values of the landslide density to estimate the influence of slide deformation on the generated tsunami characteristics. Simulated results show the complex flow patterns in terms of the velocity field, shoreline evolution, and free surface profiles. The predicted wave runup height is in close agreement with both the observed wave runup height and that obtained from the scaled-down experimental model.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Illustration of Gilbert Inlet showing the dimensions of the rockslide, dimensions of the impact site, and wave runup (photo courtesy of Fritz and Mader: Fritz (20))

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Figure 2

Simplified geometry of the Gilbert Inlet, the basis of the physical and numerical model used in the simulations (from Fritz (20))

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Figure 3

Experimental setup with pneumatic installation and measurement systems such as LDS, CWG, and PIV (from Fritz (20))

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Figure 4

Detailed view of the computational mesh at the Gilbert Inlet and the NE headland shoreline. (a) Geometry and computational domain for the Gilbert Inlet. (b) Computational grid for the Gilbert Inlet. (c) Detailed view of the computational mesh at the NE headland shoreline.

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Figure 5

Evolution of the flow-field after landslide impact with time (computational results): (a) at Impact, (b) 6 s after impact, (c) 14 s after impact, (d) 17 s after impact, and (e) 20 s after impact

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Figure 6

Evolution of the flow-field after landslide impact with time (experimental results) (PIV velocity vector-field sequence) (from Fritz (20)): at impact, T=6.92 s after impact, T=14.50 s after impact, T=16.43 s after impact, and T=19.79 s after impact

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Figure 7

Evolution of the flow-field with wave runup sequence on headland slope (computational results): 18 s after impact, 24 s after impact, and 34 s after impact

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Figure 8

PIV velocity vector-field sequence of wave runup on headland slope (experimental results) (from Fritz (20))

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Figure 9

Predicted wave height record at location x=885 m for different values of initial void fraction

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Figure 10

Wave record at location x=885 m (experimental results) (from Fritz (20))

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Figure 11

Predicted wave runup record on headland ramp at locations x=1342 m

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Figure 12

Experimental observations of wave runup record on headland ramp at locations x=1342 m (from Fritz (20))

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