Experimental study on dynamical blocking conditions of net exchange flows

Janek Laanearu, Alan Cuthbertson, Magda Carr, Joel Sommeria, Madis-Jaak Lillover, Samuel Viboud, Jarle Berntsen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Experimental results are presented from a series of large-scale laboratory investigations of the internal flow of restricted net exchange flows across a submerged trapezoidal sill, intended to give higher Reynolds numbers that are more representative of real situations (e.g. semi-enclosed estuaries and fjords). The experimental program, funded under the EU FP7 Hydralab IV Initiative, was conducted in the LEGI experimental facility in Grenoble. Measurements focused on obtaining velocity and density profiles in the vicinity of the obstruction to observe and quantify interfacial mixing processes under a range of parametric forcing conditions (i.e. variable saline and fresh water flow rates; density differences; water levels). Detailed synoptic velocity fields were analysed across the obstruction using particle image velocimetry (PIV), with high-resolution density profiles obtained by micro-conductivity probes, to aid qualitative and quantitative interpretation of these internal flow processes. These measurements were processed to define parametric conditions under which the saline intrusions became arrested through interface ventilation at the intrusion nose by the upper, counter-flowing, freshwater layer. An internal flow hydraulic model has been developed to help interpret the parametric conditions under which this saline flow is blocked in such bi-directional, estuarine exchange flows. The results from this study are aimed primarily at improving representation of interfacial mixing processes within semi-enclosed estuaries and fjords, as well as providing datasets for future validation of advanced numerical models (CFD).
Original languageEnglish
Title of host publicationInternational Symposium on Statified Flows
Place of PublicationSan Diego
Pages1-8
Number of pages8
Volume1, issue 1
Publication statusPublished - 29 Aug 2016
EventVIIIth International Symposium on Stratified Flows (ISSF) 2016 - San Diego, United States
Duration: 29 Aug 20161 Sep 2016
https://cpaess.ucar.edu/meetings/2016/8th-international-symposium-stratified-flows-issf

Conference

ConferenceVIIIth International Symposium on Stratified Flows (ISSF) 2016
Abbreviated titleISSF 2016
CountryUnited States
CitySan Diego
Period29/08/161/09/16
Internet address

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experimental study
fjord
estuary
saline intrusion
Reynolds number
sill
ventilation
water flow
water level
conductivity
probe
hydraulics

Cite this

Laanearu, J., Cuthbertson, A., Carr, M., Sommeria, J., Lillover, M-J., Viboud, S., & Berntsen, J. (2016). Experimental study on dynamical blocking conditions of net exchange flows. In International Symposium on Statified Flows (Vol. 1, issue 1, pp. 1-8). San Diego.
Laanearu, Janek ; Cuthbertson, Alan ; Carr, Magda ; Sommeria, Joel ; Lillover, Madis-Jaak ; Viboud, Samuel ; Berntsen, Jarle. / Experimental study on dynamical blocking conditions of net exchange flows. International Symposium on Statified Flows. Vol. 1, issue 1 San Diego, 2016. pp. 1-8
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title = "Experimental study on dynamical blocking conditions of net exchange flows",
abstract = "Experimental results are presented from a series of large-scale laboratory investigations of the internal flow of restricted net exchange flows across a submerged trapezoidal sill, intended to give higher Reynolds numbers that are more representative of real situations (e.g. semi-enclosed estuaries and fjords). The experimental program, funded under the EU FP7 Hydralab IV Initiative, was conducted in the LEGI experimental facility in Grenoble. Measurements focused on obtaining velocity and density profiles in the vicinity of the obstruction to observe and quantify interfacial mixing processes under a range of parametric forcing conditions (i.e. variable saline and fresh water flow rates; density differences; water levels). Detailed synoptic velocity fields were analysed across the obstruction using particle image velocimetry (PIV), with high-resolution density profiles obtained by micro-conductivity probes, to aid qualitative and quantitative interpretation of these internal flow processes. These measurements were processed to define parametric conditions under which the saline intrusions became arrested through interface ventilation at the intrusion nose by the upper, counter-flowing, freshwater layer. An internal flow hydraulic model has been developed to help interpret the parametric conditions under which this saline flow is blocked in such bi-directional, estuarine exchange flows. The results from this study are aimed primarily at improving representation of interfacial mixing processes within semi-enclosed estuaries and fjords, as well as providing datasets for future validation of advanced numerical models (CFD).",
author = "Janek Laanearu and Alan Cuthbertson and Magda Carr and Joel Sommeria and Madis-Jaak Lillover and Samuel Viboud and Jarle Berntsen",
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Laanearu, J, Cuthbertson, A, Carr, M, Sommeria, J, Lillover, M-J, Viboud, S & Berntsen, J 2016, Experimental study on dynamical blocking conditions of net exchange flows. in International Symposium on Statified Flows. vol. 1, issue 1, San Diego, pp. 1-8, VIIIth International Symposium on Stratified Flows (ISSF) 2016, San Diego, United States, 29/08/16.

Experimental study on dynamical blocking conditions of net exchange flows. / Laanearu, Janek; Cuthbertson, Alan; Carr, Magda; Sommeria, Joel; Lillover, Madis-Jaak; Viboud, Samuel; Berntsen, Jarle.

International Symposium on Statified Flows. Vol. 1, issue 1 San Diego, 2016. p. 1-8.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Experimental study on dynamical blocking conditions of net exchange flows

AU - Laanearu, Janek

AU - Cuthbertson, Alan

AU - Carr, Magda

AU - Sommeria, Joel

AU - Lillover, Madis-Jaak

AU - Viboud, Samuel

AU - Berntsen, Jarle

PY - 2016/8/29

Y1 - 2016/8/29

N2 - Experimental results are presented from a series of large-scale laboratory investigations of the internal flow of restricted net exchange flows across a submerged trapezoidal sill, intended to give higher Reynolds numbers that are more representative of real situations (e.g. semi-enclosed estuaries and fjords). The experimental program, funded under the EU FP7 Hydralab IV Initiative, was conducted in the LEGI experimental facility in Grenoble. Measurements focused on obtaining velocity and density profiles in the vicinity of the obstruction to observe and quantify interfacial mixing processes under a range of parametric forcing conditions (i.e. variable saline and fresh water flow rates; density differences; water levels). Detailed synoptic velocity fields were analysed across the obstruction using particle image velocimetry (PIV), with high-resolution density profiles obtained by micro-conductivity probes, to aid qualitative and quantitative interpretation of these internal flow processes. These measurements were processed to define parametric conditions under which the saline intrusions became arrested through interface ventilation at the intrusion nose by the upper, counter-flowing, freshwater layer. An internal flow hydraulic model has been developed to help interpret the parametric conditions under which this saline flow is blocked in such bi-directional, estuarine exchange flows. The results from this study are aimed primarily at improving representation of interfacial mixing processes within semi-enclosed estuaries and fjords, as well as providing datasets for future validation of advanced numerical models (CFD).

AB - Experimental results are presented from a series of large-scale laboratory investigations of the internal flow of restricted net exchange flows across a submerged trapezoidal sill, intended to give higher Reynolds numbers that are more representative of real situations (e.g. semi-enclosed estuaries and fjords). The experimental program, funded under the EU FP7 Hydralab IV Initiative, was conducted in the LEGI experimental facility in Grenoble. Measurements focused on obtaining velocity and density profiles in the vicinity of the obstruction to observe and quantify interfacial mixing processes under a range of parametric forcing conditions (i.e. variable saline and fresh water flow rates; density differences; water levels). Detailed synoptic velocity fields were analysed across the obstruction using particle image velocimetry (PIV), with high-resolution density profiles obtained by micro-conductivity probes, to aid qualitative and quantitative interpretation of these internal flow processes. These measurements were processed to define parametric conditions under which the saline intrusions became arrested through interface ventilation at the intrusion nose by the upper, counter-flowing, freshwater layer. An internal flow hydraulic model has been developed to help interpret the parametric conditions under which this saline flow is blocked in such bi-directional, estuarine exchange flows. The results from this study are aimed primarily at improving representation of interfacial mixing processes within semi-enclosed estuaries and fjords, as well as providing datasets for future validation of advanced numerical models (CFD).

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UR - https://researchportal.hw.ac.uk/en/publications/experimental-study-on-dynamical-blocking-conditions-of-net-exchan

M3 - Conference contribution

VL - 1, issue 1

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BT - International Symposium on Statified Flows

CY - San Diego

ER -

Laanearu J, Cuthbertson A, Carr M, Sommeria J, Lillover M-J, Viboud S et al. Experimental study on dynamical blocking conditions of net exchange flows. In International Symposium on Statified Flows. Vol. 1, issue 1. San Diego. 2016. p. 1-8