Restricted Exchange and Saline Blockage over a Submerged Sill

Alan Cuthbertson, Janek Laanearu

Research output: Contribution to conferencePaper

Abstract

Results are presented from a series of large-scale experiments investigating the internal dynamics of bi-directional exchange flows generated across a submerged, trapezoidal, sill obstruction, with net-barotropic flow components in the upper fresh or lower saline water layers. High-resolution velocity fields and density profiles were obtained using particle image velocimetry and micro-conductivity probes, respectively, in the vicinity of the obstruction to measureinternal-flow dynamics under a range of parametric forcing conditions (i.e. variable saline and fresh water volume fluxes; density differences; sill obstruction submergence depths). These measurements provided qualitative and quantitative interpretation of mixing and entrainment processes generated by the bi-directional exchange flows, as well as defining the parametric conditions under which the lower saline intrusion layer became blocked across the sill. An analytical two-layer hydraulic exchange flow model was developed to include frictional and entrainment effects, both of which were needed to account for turbulent stresses and saline entrainment into the upper freshwater layer, resulting in mass exchange between the counter-flowing fresh and saline layers across the sill.
Original languageEnglish
Publication statusPublished - Feb 2017
Event4th International Symposium on Shallow Flows - Eindhoven University of Technology, Eindhoven, Netherlands
Duration: 26 Jun 201728 Jun 2017
http://issf2017.tue.nl/

Conference

Conference4th International Symposium on Shallow Flows
Abbreviated title4th ISSF
CountryNetherlands
CityEindhoven
Period26/06/1728/06/17
Internet address

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sill
entrainment
barotropic motion
saline intrusion
submergence
conductivity
probe
hydraulics
water
experiment

Cite this

Cuthbertson, A., & Laanearu, J. (2017). Restricted Exchange and Saline Blockage over a Submerged Sill. Paper presented at 4th International Symposium on Shallow Flows, Eindhoven, Netherlands.
Cuthbertson, Alan ; Laanearu, Janek. / Restricted Exchange and Saline Blockage over a Submerged Sill. Paper presented at 4th International Symposium on Shallow Flows, Eindhoven, Netherlands.
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Cuthbertson, A & Laanearu, J 2017, 'Restricted Exchange and Saline Blockage over a Submerged Sill' Paper presented at 4th International Symposium on Shallow Flows, Eindhoven, Netherlands, 26/06/17 - 28/06/17, .

Restricted Exchange and Saline Blockage over a Submerged Sill. / Cuthbertson, Alan; Laanearu, Janek.

2017. Paper presented at 4th International Symposium on Shallow Flows, Eindhoven, Netherlands.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Restricted Exchange and Saline Blockage over a Submerged Sill

AU - Cuthbertson, Alan

AU - Laanearu, Janek

PY - 2017/2

Y1 - 2017/2

N2 - Results are presented from a series of large-scale experiments investigating the internal dynamics of bi-directional exchange flows generated across a submerged, trapezoidal, sill obstruction, with net-barotropic flow components in the upper fresh or lower saline water layers. High-resolution velocity fields and density profiles were obtained using particle image velocimetry and micro-conductivity probes, respectively, in the vicinity of the obstruction to measureinternal-flow dynamics under a range of parametric forcing conditions (i.e. variable saline and fresh water volume fluxes; density differences; sill obstruction submergence depths). These measurements provided qualitative and quantitative interpretation of mixing and entrainment processes generated by the bi-directional exchange flows, as well as defining the parametric conditions under which the lower saline intrusion layer became blocked across the sill. An analytical two-layer hydraulic exchange flow model was developed to include frictional and entrainment effects, both of which were needed to account for turbulent stresses and saline entrainment into the upper freshwater layer, resulting in mass exchange between the counter-flowing fresh and saline layers across the sill.

AB - Results are presented from a series of large-scale experiments investigating the internal dynamics of bi-directional exchange flows generated across a submerged, trapezoidal, sill obstruction, with net-barotropic flow components in the upper fresh or lower saline water layers. High-resolution velocity fields and density profiles were obtained using particle image velocimetry and micro-conductivity probes, respectively, in the vicinity of the obstruction to measureinternal-flow dynamics under a range of parametric forcing conditions (i.e. variable saline and fresh water volume fluxes; density differences; sill obstruction submergence depths). These measurements provided qualitative and quantitative interpretation of mixing and entrainment processes generated by the bi-directional exchange flows, as well as defining the parametric conditions under which the lower saline intrusion layer became blocked across the sill. An analytical two-layer hydraulic exchange flow model was developed to include frictional and entrainment effects, both of which were needed to account for turbulent stresses and saline entrainment into the upper freshwater layer, resulting in mass exchange between the counter-flowing fresh and saline layers across the sill.

UR - https://issf2017.tue.nl/index.html

UR - https://issf2017.tue.nl/program/programme_ISSF.pdf

UR - https://researchportal.hw.ac.uk/en/publications/restricted-exchange-and-saline-blockage-over-a-submerged-sill

M3 - Paper

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Cuthbertson A, Laanearu J. Restricted Exchange and Saline Blockage over a Submerged Sill. 2017. Paper presented at 4th International Symposium on Shallow Flows, Eindhoven, Netherlands.