CRSP-3D Application for Remediating a Rockfall at Yosemite National Park

Haramy, Khamis Y.; Zhang, Runing; Rock, Alan

doi:10.1061/9780784412787.062

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…In an effort to understand better the potential sources for englacial and supraglacial debris on Mullins and Friedman Glaciers, we utilized the numerical simulations within CRSP‐3d (Colorado Rockfall Simulation Program) [ Andrew et al ., ; Haramy et al ., ] to model run out distances for falling clasts sourced along the headwall of Mullins Glacier. At the core of CRSP‐3d is a discrete element method (DEM) simulation of rock velocity (translational and rotation in three dimensions) and contact forces between rock and slope [ Andrew et al ., ; Bartingale et al ., ; Leine et al ., ].…”

Section: Results: Modelingmentioning

confidence: 99%

Cold‐based debris‐covered glaciers: Evaluating their potential as climate archives through studies of ground‐penetrating radar and surface morphology

et al. 2014

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We describe the morphology and internal structure of Mullins and Friedman Glaciers, two cold-based, debris-covered alpine glaciers that occur in neighboring valleys in the McMurdo Dry Valleys, Antarctica. Both glaciers are overlain by a single, dry supraglacial debris layer (8-75 cm thick); each mantling debris layer is marked with near-identical patterns of arcuate ridges and steps, as well as corresponding changes in bulk grain size, meter-scale surface topography, and thermal contraction crack polygons. Results from 24 km of ground-penetrating radar data show that the ice within the uppermost 1-2 km of Mullins and Friedman Glaciers is essentially free of englacial debris (<1% by volume) but thereafter is interspersed with bands of englacial debris (each <3 m thick and dipping up glacier) that intersect the ice surface at all major surface ridges and steps. The similarity in number and pattern of englacial debris bands and corresponding surface ridges and steps across both glaciers, along with model results and observations that call for negligible basal entrainment, is best explained by episodic environmental change at valley headwalls. Our working hypothesis is that layers of englacial debris originate as supraglacial lags that form in ice-accumulation areas during times of reduced net ice accumulation; following renewed net ice accumulation, these lags are subsequently buried by snow and ice, flow englacially, and intersect the ice surface to impart distinctive changes in the texture of supraglacial debris and topographic relief. The implication is that the englacial structure and surface morphology of these cold-based, debris-covered glaciers preserves a consistent record of climate and environmental change.

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Section: Results: Modelingmentioning

confidence: 99%

Cold‐based debris‐covered glaciers: Evaluating their potential as climate archives through studies of ground‐penetrating radar and surface morphology

et al. 2014

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3D Rockfall Modeling and Mitigation Design Reliability

Zhang

Rock

2015

Engineering Geology for Society and Territory - Volume 2

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Calibration of restitution coefficients using rockfall simulations based on 3D photogrammetry model: a case study

et al. 2015

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This paper presents a case study of an excavated rock slope to assess the coefficients of restitution using the results from field rockfall tests and corresponding rockfall simulations based on 3D photogrammetric slope surface models. The results from the field rockfall tests showed that rockfall trajectories were controlled by the orientations of joints at the initial point of the rockfalls. The lateral dispersion ratio (D H /L) of the trajectories was influenced by the shape index (γ) of falling rocks as well. The directions of rockfall trajectories, which were obtained from the 3D simulation based on the 3D photogrammetric surface models, were in agreement with the field rockfall tests. Throughout 2D analysis, which was performed using predefined trajectories from the 3D simulations, the coefficients of restitution were successfully calibrated using elapsed times and distances obtained from the field rockfall tests. Based on the accurate 3D photogrammetric slope model, the back-calculated coefficients of restitution from the 3D and 2D simulations combined with field rockfall tests provided consistent results between the numerical analyses and the field experimental data.

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CRSP-3D Application for Remediating a Rockfall at Yosemite National Park

Cited by 3 publications

References 2 publications

Cold‐based debris‐covered glaciers: Evaluating their potential as climate archives through studies of ground‐penetrating radar and surface morphology

Cold‐based debris‐covered glaciers: Evaluating their potential as climate archives through studies of ground‐penetrating radar and surface morphology

3D Rockfall Modeling and Mitigation Design Reliability

Calibration of restitution coefficients using rockfall simulations based on 3D photogrammetry model: a case study

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