A first classification scheme of flow-bed interaction for clay-laden density currents and soft substrates

Type Article
Date 2013-04
Language English
Author(s) Verhagen Iris Therese Elise1, Baas Jaco Hugo1, Silva Jacinto Ricardo2, McCaffrey William Dale3, Davies Alan Geoffrey1
Affiliation(s) 1 : Bangor Univ, Sch Ocean Sci, Menai Bridge LL59 5AB, Ilse Of Anglese, Wales.
2 : IFREMER, Ctr Brest, Marine Geosci Unity, Plouzane, France.
3 : Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England.
Source Ocean Dynamics (1616-7341) (Springer Heidelberg), 2013-04 , Vol. 63 , N. 4 , P. 385-397
DOI 10.1007/s10236-013-0602-8
WOS© Times Cited 8
Note This article is part of the Topical Collection on the 11th International Conference on Cohesive Sediment Transport
Keyword(s) Turbidity currents, Cohesive substrates, Flow-substrate interaction, Flume experiments, Phase diagram
Abstract Many aquatic environments exhibit soft, muddy substrates, but this important property has largely been ignored in process-based models of Earth-surface flow. Novel laboratory experiments were carried out to shed light on the feedback processes that occur when particulate density currents (turbidity currents) move over a soft mud substrate. These experiments revealed multiple types of flow-bed interaction and large variations in bed deformation and bed erosion, which are interpreted to be related to the interplay between the shear forces of the current and the stabilising forces in the bed. Changes in this force balance were simulated by varying the clay concentrations in the flow and in the bed. Five different interaction types are described, and dimensional and non-dimensional phase diagrams for flow-bed interaction are presented.
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