Experiments on transitional regime sediment density flows and resulting deposits
Barnaal, Zachary D
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https://hdl.handle.net/2142/95373
Description
Title
Experiments on transitional regime sediment density flows and resulting deposits
Author(s)
Barnaal, Zachary D
Issue Date
2016-12-01
Director of Research (if dissertation) or Advisor (if thesis)
Parker, Gary
Department of Study
Civil & Environmental Eng
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2017-03-01T15:49:20Z
Keyword(s)
density flows
turbidity currents
debris flows
subaqueous
sediment density currents
hybrid event beds (HEBs)
transitional regime flow
argillaceous
linked-debrite
linked-turbidite
experiments
model
flume
submerged
flow
clay
silt
sand
mud
deposit
Abstract
Much remains unknown regarding the sedimentary deposits of submarine density flows. Certain density flows may transition from a more turbulent to a more coherent flow regime e.g. by a loss of velocity in flows with large concentrations of suspended sediment. Such transitional flows are produced when turbulence becomes suppressed due to entrainment of cohesive sediment or from flow deceleration. Argillaceous sandstones and linked turbidite-debrites are types of submarine sediment deposits in a category known as hybrid event beds, and are interpreted to be emplaced by transitional regime flows (Talling, 2007; Davis, 2009; Haughton, 2009; Hodgson, 2009; Baas, 2011; Lee, 2013; and Talling, 2013). Sediment density current experiments have been conducted in a submerged flume to physically model such transitional flows. Correlations between the properties of the flows and the properties of the deposit exist and the results allow us to better understand sediment density currents with deterministic rheology and the resulting geology.
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