1. Numerical modeling and sensitivity analysis of landslide tsunami: Lituya Bay and La Palma
Josh Taron

2. The Setting: Lituya Bay
Miller, 1960

3. The Stage: Gilbert Inlet
Modified from Fritz et al., 2001

4. The Numerical Recipe: Level-Set
Indicator Functions and Smooth Heaviside
Demarcating Physical Properties
Dimensionless Navier-Stokes
Advection-Diffusion of Indicators

5. Numerical Recipe: Landslide
FEMLAB’s Full Stress Tensor
Iverson et al (1985)

6. No slip boundaries with bulk density 1610 kg/m3
Slip boundary - same conditions

7. Validation Maximum Landslide Velocity Wave Height 1610 kg 30.6 Mm
Newmark, 1965
Dynamic FOS
Maximum Velocity
Noda, 1970
Slingerland et al., 1979
a = b=0.71
1610 kg
30.6 Mm
FEMLAB
Slingerland et al
(using 48 m/s)
Noda
Max Vel.
Height
158m
100m
125m --
velocity
48m/s
55 m/s
Slide path length = 358m, slide height, h, = 90m

8. Parametric Analysis Density Slope Angle Slide Volume Slide Velocity
Wave Height
1610 40
30.6 Mm3
48 m/s
158m
51.6 Mm3
56 m/s
203m
2700
66 m/s
208m 45
52 m/s
178m
Slip Boundary
57 m/s
228m

9. References
Iverson, R., A constitutive equation for mass movement behavior. Journal of Geology, 93:
Miller, D.J., A timely account of the nature and possible causes of certain giant waves, with eyewitness reports of their destructive capacity, Geological survey professional paper 354-C, U.S. Department of the Interior, Washington.
Fritz, H.M., Hager, W. H., and Minor, H. -E., Lituya Bay case: Rockslide impact and wave run-up. Science of Tsunami Hazards, 19(1): 3-22.
Newmark, N.M., Effects of earthquakes on dams and embankments. Geotechnique, 15(2):
Noda, E., Water waves generated by landslides: Proceedings of the American Society of Civil Engineers. Journal Waterways Harbors Div, 96(4):
Slingerland, R.L., and Voight, B., Occurences, properties, and predictive models of landslide-generated water waves. In: Developments in Geotechnical Engineering 14B: Rockslides and Avalanches, 2, Engineering Sites., Voight, B., ed.(Elsevier Scientific Publishing Company):

10. Thanks
To be continued with La Palma…