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An SPH study on viscoplastic surges overriding mobile beds: The many regimes of entrainment

Goodwin, Saoirse Robin 1; Lapillonne, Suzanne; Piton, Guillaume; Chambon, Guillaume
1 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)

Abstract:

Flow-type landslides entrain mobile bed material, but the processes involved are diverse and require systematic study. We perform direct numerical simulations using the open-source SPH package DualSPHysics with a regularized Herschel–Bulkley rheology. We then compare model output with physical test data, and hence investigate the effects of varying the bed yield stress 𝜏$_{𝑦,b}$ and bed depth ℎ$_b$, interpreting the results using a newly-identified set of dimensionless numbers. Results reveal diverse interaction regimes between surges and mobile beds, including ‘‘rigid bed’’, ‘‘lubrication’’, ‘‘shallow ploughing’’, ‘‘surfing’’, ‘‘plunging’’, and ‘‘deep ploughing’’. Shallow, borderline-stable beds ‘‘lubricate’’ the surge: once destabilized, these beds cause strong acceleration of the combined flow front. Deeper borderline-stable beds allow the surge material to ‘‘plunge’’ downward, massively displacing bed material upward and downstream. For stabler beds, ‘‘ploughing’’ and ‘‘surfing’’ are associated with intermediate and high values of 𝜏$_{𝑦,b}$, respectively. In both cases, beds retard the surge, with mobile dams forming for ‘‘ploughing’’ regimes. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163786
Veröffentlicht am 08.11.2023
Originalveröffentlichung
DOI: 10.1016/j.cageo.2023.105476
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2023
Sprache Englisch
Identifikator ISSN: 0098-3004, 1873-7803
KITopen-ID: 1000163786
Erschienen in Computers and Geosciences
Verlag Elsevier
Band 181
Seiten Art.-Nr.: 105476
Vorab online veröffentlicht am 05.10.2023
Schlagwörter Landslides, Smoothed particle hydrodynamics, Viscoplastic, Entrainment
Nachgewiesen in Scopus
Dimensions
Web of Science
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