Rational Way To Estimate Velocities of Earthquake-Induced Debris Flow From Super-Elevations


Abstract eng:
Estimation of debris flow velocity based on Forced vortex equation by using the super-elevation is a conceivable approach in earthquake-induced geo-hazard studies. A super-elevation can be seen through a curved trail of debris flow, where the centrifugal force is responsible for the higher flow depth on the outer bend. Post-flow field investigation is the solitary way to measure the super-elevation at certain cross-sections. However, only the remnant flow-marks are visible, which can mislead the actual velocity of the flow. Highlighting this problem, a series of numerical simulations using the Smoothed Particle Hydrodynamics (SPH) are carried out to check the aptness of applying flow-marks in the debris flow velocity estimation. Velocities from flow-marks underestimate actual velocities near the source region, while they converge on real velocities as the distance to source increases. Afterward, numerical results are justified with the one well documented real debris event called “Shiraito river debris flow”, which happened near the rim of Hakone Crater, Kanagawa prefecture, Japan, ensuing from the 1923 Great Kanto earthquake.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1186.:
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