Mixing in stratified turbulent layers on the steep sloping walls of Monterey Submarine Canyon

Danielle Wain, M. C. Gregg, M.H. Alford, R. C. Lien, R A Hall, G. S. Carter

Research output: Contribution to conference › Abstract

Abstract

Strong internal tide generated currents and rough topography lead to intense mixing at the bottom and the sloping sidewalls of Monterey Submarine Canyon. Estimates of mixing were made from measurements with SWIMS3, a depth-cycling towed body, at eleven cross-canyon transects and two along canyon-transects in upper Monterey canyon (at thalweg depths < 700 m) over the course of two spring tides and one neap tide. The Gooseneck Ridge and other topographic features in the sinuous canyon acted as roughness elements and hydraulic elements in the baroclinic flow, generating a stratified turbulent bottom boundary layer, similar to that observed by Kunze et al. (2012) elsewhere in the canyon, that was present throughout the measurement region. The cross-canyon transects show a layer of elevated mixing (K >10^(-3) m^2/s) over the canyon bottom, ranging from 70 m thick during neap tide to 300 m thick during spring tide over topographic features. The regions of elevated mixing extend up the canyon sidewalls, diminishing in thickness and magnitude of mixing as the shelf is approached. These sidewall boundary layers generated by the internal tide may be important for sediment resuspension and other transport processes in the canyon.
Original languageEnglish
Publication statusPublished - Sep 2014
EventChallenger Society Marine Science Conference - Plymouth, UK United Kingdom
Duration: 8 Sep 2014 → 12 Sep 2014

Conference

ConferenceChallenger Society Marine Science Conference
CountryUK United Kingdom
CityPlymouth
Period8/09/14 → 12/09/14

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submarine canyon
canyon
tide
internal tide
transect
towed body
baroclinic motion
thalweg
turbulent boundary layer
benthic boundary layer
resuspension
transport process
roughness
boundary layer
topography
hydraulics

Cite this

Wain, D., Gregg, M. C., Alford, M. H., Lien, R. C., Hall, R. A., & Carter, G. S. (2014). Mixing in stratified turbulent layers on the steep sloping walls of Monterey Submarine Canyon. Abstract from Challenger Society Marine Science Conference, Plymouth, UK United Kingdom.

Mixing in stratified turbulent layers on the steep sloping walls of Monterey Submarine Canyon. / Wain, Danielle; Gregg, M. C.; Alford, M.H.; Lien, R. C.; Hall, R A; Carter, G. S.

2014. Abstract from Challenger Society Marine Science Conference, Plymouth, UK United Kingdom.

Research output: Contribution to conference › Abstract

Wain, D, Gregg, MC, Alford, MH, Lien, RC, Hall, RA & Carter, GS 2014, 'Mixing in stratified turbulent layers on the steep sloping walls of Monterey Submarine Canyon' Challenger Society Marine Science Conference, Plymouth, UK United Kingdom, 8/09/14 - 12/09/14, .
Wain D, Gregg MC, Alford MH, Lien RC, Hall RA, Carter GS. Mixing in stratified turbulent layers on the steep sloping walls of Monterey Submarine Canyon. 2014. Abstract from Challenger Society Marine Science Conference, Plymouth, UK United Kingdom.
Wain, Danielle ; Gregg, M. C. ; Alford, M.H. ; Lien, R. C. ; Hall, R A ; Carter, G. S. / Mixing in stratified turbulent layers on the steep sloping walls of Monterey Submarine Canyon. Abstract from Challenger Society Marine Science Conference, Plymouth, UK United Kingdom.
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AU - Wain, Danielle

AU - Gregg, M. C.

AU - Alford, M.H.

AU - Lien, R. C.

AU - Hall, R A

AU - Carter, G. S.

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N2 - Strong internal tide generated currents and rough topography lead to intense mixing at the bottom and the sloping sidewalls of Monterey Submarine Canyon. Estimates of mixing were made from measurements with SWIMS3, a depth-cycling towed body, at eleven cross-canyon transects and two along canyon-transects in upper Monterey canyon (at thalweg depths < 700 m) over the course of two spring tides and one neap tide. The Gooseneck Ridge and other topographic features in the sinuous canyon acted as roughness elements and hydraulic elements in the baroclinic flow, generating a stratified turbulent bottom boundary layer, similar to that observed by Kunze et al. (2012) elsewhere in the canyon, that was present throughout the measurement region. The cross-canyon transects show a layer of elevated mixing (K >10^(-3) m^2/s) over the canyon bottom, ranging from 70 m thick during neap tide to 300 m thick during spring tide over topographic features. The regions of elevated mixing extend up the canyon sidewalls, diminishing in thickness and magnitude of mixing as the shelf is approached. These sidewall boundary layers generated by the internal tide may be important for sediment resuspension and other transport processes in the canyon.

AB - Strong internal tide generated currents and rough topography lead to intense mixing at the bottom and the sloping sidewalls of Monterey Submarine Canyon. Estimates of mixing were made from measurements with SWIMS3, a depth-cycling towed body, at eleven cross-canyon transects and two along canyon-transects in upper Monterey canyon (at thalweg depths < 700 m) over the course of two spring tides and one neap tide. The Gooseneck Ridge and other topographic features in the sinuous canyon acted as roughness elements and hydraulic elements in the baroclinic flow, generating a stratified turbulent bottom boundary layer, similar to that observed by Kunze et al. (2012) elsewhere in the canyon, that was present throughout the measurement region. The cross-canyon transects show a layer of elevated mixing (K >10^(-3) m^2/s) over the canyon bottom, ranging from 70 m thick during neap tide to 300 m thick during spring tide over topographic features. The regions of elevated mixing extend up the canyon sidewalls, diminishing in thickness and magnitude of mixing as the shelf is approached. These sidewall boundary layers generated by the internal tide may be important for sediment resuspension and other transport processes in the canyon.

M3 - Abstract

ER -