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Queen’s Landslide Tsunami Flume Dataset – Impulse waves created by dry and saturated granular flows
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Mulligan, Ryan P.; Take, Andy — 2023-05-18 This dataset provides raw wave probe data for a series of experiments conducted in the Queen’s Landslide Flume using dry and saturated granular materials flowing down a thirty-degree slope to generate impulse waves. The parameter space explored in this study covers changes to the slide material type (i.e. to vary mobility of the slide) and the reservoir water depth h (i.e.. to change the wave speed). A total of 21 new experiments were performed in the present study (16 dry granular flow experiments and 5 saturated granular flow experiments).
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Queen’s Landslide Tsunami Flume Dataset - Water Impulse Waves
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Take, Andy; Mulligan, Ryan P.; Bullard, Gemma — 2019-01-07 This dataset provides raw wave probe data for a series of experiments conducted in the Queen’s Landslide Flume using water flowing down a thirty-degree slope to generate impulse waves. A total of 41 tests were completed using four source volumes that increased incrementally from 0.1-0.4 m3 in water depths (relative to z = 0 m at the base of the flume) ranging from 0.15-0.65 m in increments of 0.05 m.
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Queen’s Landslide Tsunami Flume Dataset - Runup of landslide-generated waves breaking on steep slopes
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Take, Andy; Mulligan, Ryan P.; Trinaistich, Wolfe — 2021-03-29 This dataset provides observations of runup of breaking and non-breaking impulse waves on steep slopes of 25°, 35° and 45°. Impulse waves were generated in a series of 36 laboratory flume experiments by releasing a range of slide source volumes of highly mobile slide material (water) into a different reservoir depths to vary incipient wave characteristics and assess their impact on observed runup behaviour.
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Footprints on the beach: visualizing dilation-induced air entry
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Parera Morales, Ferran; Siemens, Greg; Pinyol, Nuria; Take, Andy — 2024-06-18 The dry fringe that appears beneath a footprint on a beach is a visual manifestation of dilation. Dilation causes the sand to attempt to increase in volume on shearing, resulting in negative pore pressure, and enhanced bearing capacity. Conventional theory cannot explain this increase in strength, suggesting instead that bearing capacity with the phreatic surface at the sand surface should be approximately half that of the dry case. To explore this apparent contradiction, ten load-controlled bearing capacity experiments were performed on transparent soil with phreatic surfaces ranging from 100 mm below to 30 mm above the footing. For phreatic surfaces deeper than the footing width, failure occurred within the dry material. In shallower phreatic surface conditions, bearing capacity increased as the phreatic surface approached the surface. Air entry was observed to initiate along the top surface of the saturated layer and extend to the depth of the bearing capacity mechanism. For the case of the phreatic and soil surfaces being coincident, the bearing capacity was observed to be more than double that of the dry case. In submerged cases bearing capacity was less than at-surface, as there was no air-fluid interface to enhance the development of negative pore pressure.
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Wave generation from granular column collapse
Borealis
Treflik-Body, Erica; Steel, Elizabeth; Take, Andy; Mulligan, Ryan P. — 2024-05-24 This dataset includes observations from laboratory experiments of granular collapse, including the amplitude and runup of tsunamis that are generated.
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Evaluation of Laboratory Methods to Quantify Particle Size Segregation Using Image Analysis in Landslide Flume Tests
Borealis
Kimball, Julia; Bowman, E.T.; Gray, J.M.N.T.; Take, Andy — 2024-10-18 Landslides comprised of a wide range of particle sizes (e.g. debris flows) exhibit flow structures arising from particle size segregation. Segregation influences the mobility of the flow, the development of debris fans, and the resulting impact forces to be expected when designing barriers and containment structures. In order to capture the flow dynamics of segregable materials in numerical simulations, experimental datasets quantifying segregation in the final deposit are required. However, the measurement of segregation is not a straightforward task as segregation observed at an external transparent boundary may not be indicative of segregation within the bulk of the landslide mass due to sidewall friction. In this paper we explore the use of four different strategies to optically measure particle size segregation in large landslide flume tests, comparing measurements taken i) at the external transparent flume boundary; ii) using a thin transparent plane as a splitter plate along the centre of the flow; and using a iii) vertically; or iv) horizontally inserted transparent plate into the static deposit after flow arrest. Relationships between concentrations measured by projected area (i.e. sidewall image) to concentrations by mass are derived and validated for a tridisperse mixture to assess which sampling method most closely represented the original source volume. Of the four strategies tested, the transparent splitter plane method was identified to cause the least amount of out-of-plane segregation of particles, provides a rich database of highly detailed observations of segregation of a tridisperse granular flows that can be used to evaluate future numerical model outcomes, and is recommended for future laboratory flume investigations.

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(source : Queen's University Dataverse) AND (auteur : Take, Andy)

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