Physical modelling of landslides into reservoirs: Effect of capillarity on rheology of granular landslide at impact

Take, W. Andy; Mulligan, Ryan P.; Stevenson, Elizabeth; Miller, G.

doi:10.1201/9781315375007-225

Cited by 1 publication

(3 citation statements)

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“…Similar to the observations of Take et al . [], the visual effects of side wall friction are mainly limited to the trailing edge of the deposit; however, to minimize the influence of side wall friction on the interpretation and comparison of deposit morphologies, only the deposits within the central 0.2 m width of the flume are analyzed, as shown in Figure . The results are separated into two main groups: Figure a shows results for experiments in which the final deposit thickness is less than or approximately equal to the still water depth, while Figure b shows results for experiments in which the final deposit thickness is greater than the still water depth.…”

Section: Results and Analysismentioning

confidence: 99%

“…[] indicate that granular flows of this material will accelerate down the 30° slope with dynamic bed friction angles ranging from 22° (dynamic interface friction of spheres on the bare aluminum plate) to 26° (dynamic interface friction of spheres if the aluminum surface was roughened). The 3 mm nominal particle diameter was selected because this size of particle is sufficiently large to avoid significant capillarity effects on landslide mobility if the material is reused in a slightly damp moisture condition, thereby avoiding the need to fully dry over 500 kg of material between experiments [ Take et al ., ].…”

Section: Physical Modelmentioning

confidence: 99%

“…Following Take et al . [], the Structure from Motion (SfM) photogrammetry software Photoscan is used to generate a dense point cloud representing the three‐dimensional shape of the deposit.…”

Section: Physical Modelmentioning

confidence: 99%

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Tsunamis generated by long and thin granular landslides in a large flume

et al. 2017

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In this experimental study, granular material is released down slope to investigate landslide‐generated waves. Starting with a known volume and initial position of the landslide source, detailed data are obtained on the velocity and thickness of the granular flow, the shape and location of the submarine landslide deposit, the amplitude and shape of the near‐field wave, the far‐field wave evolution, and the wave runup elevation on a smooth impermeable slope. The experiments are performed on a 6.7 m long 30° slope on which gravity accelerates the landslides into a 2.1 m wide and 33.0 m long wave flume that terminates with a 27° runup ramp. For a fixed landslide volume of 0.34 m3, tests are conducted in a range of still water depths from 0.05 to 0.50 m. Observations from high‐speed cameras and measurements from wave probes indicate that the granular landslide moves as a long and thin train of material, and that only a portion of the landslide (termed the “effective mass”) is engaged in activating the leading wave. The wave behavior is highly dependent on the water depth relative to the size of the landslide. In deeper water, the near‐field wave behaves as a stable solitary‐like wave, while in shallower water, the wave behaves as a breaking dissipative bore. Overall, the physical model observations are in good agreement with the results of existing empirical equations when the effective mass is used to predict the maximum near‐field wave amplitude, the far‐field amplitude, and the runup of tsunamis generated by granular landslides.

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Section: Results and Analysismentioning

confidence: 99%

Section: Physical Modelmentioning

confidence: 99%