Long runout landslides: a solution from granular mechanics

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ID: 75109
2015
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Abstract
Large landslides exhibit surprisingly long runout distances compared to a rigid body sliding from the same slope, and the mechanism of this phenomena has been studied for decades. This paper shows that the observed long runouts can be explained quite simply via a granular pile flowing downhill, while collapsing and spreading, without the need for frictional weakening that has traditionally been suggested to cause long runouts. Kinematics of the granular flow is divided into center of mass motion and spreading due to flattening of the flowing mass. We solve the center of mass motion analytically based on a frictional law valid for granular flow, and find that center of mass runout is similar to that of a rigid body. Based on the shape of deposits observed in experiments with collapsing granular columns and numerical simulations of landslides, we derive a spreading length Rf~V^1/3. Spreading of a granular pile, leading to a deposit angle much lower than the angle of repose or the dynamic friction angle, is shown to be an important, often dominating, contribution to the total runout distance, accounting for the long runouts observed for natural landslides.
Reference Key
eparez2015longfrontiers Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors eParez, Stanislav;eAharonov, Einat;
Journal frontiers in physics
Year 2015
DOI
DOI not found
URL
http://journal.frontiersin.org/Journal/10.3389/fphy.2015.00080/full
Keywords
Ecology Engineering (General). Civil engineering (General) Science physics environmental sciences economics as a science meteorology. climatology geology mining engineering. metallurgy geography. anthropology. recreation geophysics. cosmic physics environmental technology. sanitary engineering dynamic and structural geology

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