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A two-dimensional layer-averaged numerical model for turbidity currents

Yang Shihao, An Yi and Liu Qingquan
A two-dimensional layer-averaged numerical model for turbidity currents (in Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides, D. Gwyn Lintern (editor), D. C. Mosher (editor), L. G. Moscardelli (editor), P. T. Bobrowsky (editor), C. Campbell (editor), J. D. Chaytor (editor), J. J. Clague (editor), A. Georgiopoulou (editor), P. Lajeunesse (editor), A. Normandeau (editor), D. J. W. Piper (editor), M. Scherwath (editor), C. Stacey (editor) and D. Turmel (editor))
Special Publication - Geological Society of London (May 2018) 477 (1): 439-454

Abstract

Turbidity currents occur widely in submarine environments, but field-scale numerical simulations of the flow features have not been applied extensively. Here, we present a two-dimensional layer-averaged numerical model to simulate turbidity currents over an erodible sediment bed, and taking into consideration deposition, entrainment and friction. The numerical model was developed based on the open-source code, Basilisk, ensuring well-balanced and positivity-preserving properties. An adaptive spatial discretization was used, which allows multi-level refinement. The adaptive criterion is based on the dynamic features of the flow and sediment concentrations. The numerical scheme has a relatively high computational efficiency compared with models based on the Cartesian mesh. A hypothetical case based on a true large-scale landform (the Moroccan Turbidite System, offshore NW Africa) was studied. Compared with previous models, the current model accounted for the coupling between flow, sediment transportation and bed evolution. This approach may improve simulation results and also allow the simulation of complex field-scale landforms, while preserving the flow details.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 477
Serial Issue: 1
Title: A two-dimensional layer-averaged numerical model for turbidity currents
Title: Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides
Author(s): Yang ShihaoAn YiLiu Qingquan
Author(s): Lintern, D. Gwyneditor
Author(s): Mosher, D. C.editor
Author(s): Moscardelli, L. G.editor
Author(s): Bobrowsky, P. T.editor
Author(s): Campbell, C.editor
Author(s): Chaytor, J. D.editor
Author(s): Clague, J. J.editor
Author(s): Georgiopoulou, A.editor
Author(s): Lajeunesse, P.editor
Author(s): Normandeau, A.editor
Author(s): Piper, D. J. W.editor
Author(s): Scherwath, M.editor
Author(s): Stacey, C.editor
Author(s): Turmel, D.editor
Affiliation: Chinese Academy of Sciences, Institute of Mechanics, Beijing, China
Pages: 439-454
Published: 20180523
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 54
Accession Number: 2018-051011
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N30°00'00" - N34°00'00", W14°00'00" - W10°00'00"
Secondary Affiliation: Beijing Institute of Technology, CHN, China
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201827
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