Evaluating Hazard of Landslide-Induced Water Waves

by Rudy Slingerland, Asst. Prof. of Geology; Dept. of Geosciences, Pennsylvania State Univ., University Park, Pa. 16802,
Barry Voight, Prof. of Geology; Dept. of Geosciences, Pennsylvania State Univ., University Park, Pa. 16802,


Serial Information: Journal of the Waterway, Port, Coastal and Ocean Division, 1982, Vol. 108, Issue 4, Pg. 504-512


Document Type: Journal Paper

Discussion: Huber Andreas (See full record)
Closure: (See full record)

Abstract: Dimensional analysis of the landslide parameters which control dimensionless maximum wave amplitude, ηm/d, when slides impact with a water body, shows that dimensionless slide kinetic energy, Ek, is most important. Data from two site-specific hydraulic studies combine to produce a consistent data set and give a statistically significant linear regression equation of log (ηm/d) = -1.25 + 0.71 log (Ek), in which Ek = ρs lwhV² (2ρgd4)-¹, l, w, h, ρs, and V are slide length width, thickness, density, and maximum velocity, ρ is water density, g is gravitational acceleration, ηm = maximum wave amplitude at a standard distance r/d≈4 directly in front of a slide, d = water depth at that site, and r = radial horizontal distance from the point of slide impact. The hydraulic model studies had scale factors of 1:120 and 1:300, with 0.4m/d, back calculated from observed waves and wave run-ups for the 1958 Gilbert Inlet slide in Lituya Bay, Alaska, and the 1905 glacier fall in Disenchantment Bay, Alaska, are accurately predicted by the regression equation in the first case and conservatively predicted in the second.

Subject Headings: Water waves | Landslides | Wave equations | Water management | Wave velocity | Regression analysis | Hydraulic models | Density currents | Hydrologic data | North America | Alaska | United States

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