Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean

Cynthia Bluteau; S.L. Smith; Gregory Ivey; Tamara Schlosser; Nicole Jones

Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean

Cynthia Bluteau, S.L. Smith, Gregory Ivey, Tamara Schlosser, Nicole Jones

Oceans Graduate School

Research output: Chapter in Book/Conference paper › Conference paper

4 Citations (Scopus)

Abstract

We present observations from a three week field programme
on the Tasman Eastern Continental Shelf designed to determine
the mechanisms responsible for sediment resuspension when
tidally-forced internal waves impinge on the shelf. Using a bottom
lander on the seafloor at the 190 m isobath, we measured
sediment concentrations, velocities, and turbulent stresses near
the seabed. The bed shear stress estimated using the quadratic
drag law had the highest correlation with the observed sediment
concentrations, but were always much higher than the
critical shear stress required to initiate sediment motion. Bed
shear stresses determined from the turbulence measurements
were more reasonable in magnitude, but unresolved questions
remain. Our ultimate goal is to improve predictions of nearbed
shear stresses, and sediment re-suspension in these complex
flows.

Original language	English
Title of host publication	The Proceedings of the 20th Australasian Fluid Mechanics Conference
Editors	Greg Ivey, Nicole Jones, Tongming Zhou
Publisher	Australian Fluid Mechanics Society
Pages	1-4
Number of pages	4
ISBN (Print)	9781740523776
Publication status	Published - 2016
Event	20th Australasian Fluid Mechanics Conference - University of Western Australia, Perth, Australia Duration: 5 Dec 2016 → 8 Dec 2016 Conference number: 20 http://www.afms.org.au/20AFMC/

Conference

Conference	20th Australasian Fluid Mechanics Conference
Abbreviated title	AFMC
Country	Australia
City	Perth
Period	5/12/16 → 8/12/16
Internet address	http://www.afms.org.au/20AFMC/

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Bluteau, C., Smith, S. L., Ivey, G., Schlosser, T., & Jones, N. (2016). Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean. In G. Ivey, N. Jones, & T. Zhou (Eds.), The Proceedings of the 20th Australasian Fluid Mechanics Conference (pp. 1-4). Australian Fluid Mechanics Society. http://people.eng.unimelb.edu.au/imarusic/proceedings/20/473%20Paper.pdf

Bluteau, Cynthia ; Smith, S.L. ; Ivey, Gregory ; Schlosser, Tamara ; Jones, Nicole. / Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean. The Proceedings of the 20th Australasian Fluid Mechanics Conference. editor / Greg Ivey ; Nicole Jones ; Tongming Zhou. Australian Fluid Mechanics Society, 2016. pp. 1-4

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title = "Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean",

abstract = "We present observations from a three week field programmeon the Tasman Eastern Continental Shelf designed to determinethe mechanisms responsible for sediment resuspension whentidally-forced internal waves impinge on the shelf. Using a bottomlander on the seafloor at the 190 m isobath, we measuredsediment concentrations, velocities, and turbulent stresses nearthe seabed. The bed shear stress estimated using the quadraticdrag law had the highest correlation with the observed sedimentconcentrations, but were always much higher than thecritical shear stress required to initiate sediment motion. Bedshear stresses determined from the turbulence measurementswere more reasonable in magnitude, but unresolved questionsremain. Our ultimate goal is to improve predictions of nearbedshear stresses, and sediment re-suspension in these complexflows.",

author = "Cynthia Bluteau and S.L. Smith and Gregory Ivey and Tamara Schlosser and Nicole Jones",

year = "2016",

language = "English",

isbn = "9781740523776",

pages = "1--4",

editor = "Greg Ivey and Nicole Jones and Tongming Zhou",

booktitle = "The Proceedings of the 20th Australasian Fluid Mechanics Conference",

publisher = "Australian Fluid Mechanics Society",

note = "20th Australasian Fluid Mechanics Conference, AFMC ; Conference date: 05-12-2016 Through 08-12-2016",

url = "http://www.afms.org.au/20AFMC/",

}

Bluteau, C, Smith, SL, Ivey, G, Schlosser, T & Jones, N 2016, Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean. in G Ivey, N Jones & T Zhou (eds), The Proceedings of the 20th Australasian Fluid Mechanics Conference. Australian Fluid Mechanics Society, pp. 1-4, 20th Australasian Fluid Mechanics Conference, Perth, Australia, 5/12/16. <http://people.eng.unimelb.edu.au/imarusic/proceedings/20/473%20Paper.pdf>

Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean. / Bluteau, Cynthia; Smith, S.L.; Ivey, Gregory; Schlosser, Tamara; Jones, Nicole.

The Proceedings of the 20th Australasian Fluid Mechanics Conference. ed. / Greg Ivey; Nicole Jones; Tongming Zhou. Australian Fluid Mechanics Society, 2016. p. 1-4.

Research output: Chapter in Book/Conference paper › Conference paper

TY - GEN

T1 - Assessing the relationship between bed shear stress estimates and observations of sediment resuspension in the ocean

AU - Bluteau, Cynthia

AU - Smith, S.L.

AU - Ivey, Gregory

AU - Schlosser, Tamara

AU - Jones, Nicole

N1 - Conference code: 20

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N2 - We present observations from a three week field programmeon the Tasman Eastern Continental Shelf designed to determinethe mechanisms responsible for sediment resuspension whentidally-forced internal waves impinge on the shelf. Using a bottomlander on the seafloor at the 190 m isobath, we measuredsediment concentrations, velocities, and turbulent stresses nearthe seabed. The bed shear stress estimated using the quadraticdrag law had the highest correlation with the observed sedimentconcentrations, but were always much higher than thecritical shear stress required to initiate sediment motion. Bedshear stresses determined from the turbulence measurementswere more reasonable in magnitude, but unresolved questionsremain. Our ultimate goal is to improve predictions of nearbedshear stresses, and sediment re-suspension in these complexflows.

AB - We present observations from a three week field programmeon the Tasman Eastern Continental Shelf designed to determinethe mechanisms responsible for sediment resuspension whentidally-forced internal waves impinge on the shelf. Using a bottomlander on the seafloor at the 190 m isobath, we measuredsediment concentrations, velocities, and turbulent stresses nearthe seabed. The bed shear stress estimated using the quadraticdrag law had the highest correlation with the observed sedimentconcentrations, but were always much higher than thecritical shear stress required to initiate sediment motion. Bedshear stresses determined from the turbulence measurementswere more reasonable in magnitude, but unresolved questionsremain. Our ultimate goal is to improve predictions of nearbedshear stresses, and sediment re-suspension in these complexflows.

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BT - The Proceedings of the 20th Australasian Fluid Mechanics Conference

A2 - Ivey, Greg

A2 - Jones, Nicole

A2 - Zhou, Tongming

PB - Australian Fluid Mechanics Society

T2 - 20th Australasian Fluid Mechanics Conference

Y2 - 5 December 2016 through 8 December 2016

ER -