Laboratory study of dense gravity current propagation over porous bed layers

Alan Cuthbertson, Diane Armour, Gerard Starrs

Research output: Other contribution

Abstract

Results are presented for a series of laboratory experiments investigating the propagation characteristics of dense gravity currents over porous bed layers comprising of fine sand (FS), coarse sand (CS) and a sand-gravel (SG) mixture. Gravity currents were generated via a lock-release system and the resulting current propagation was measured by tracking the frontal position over time with high-resolution digital cameras. Dense water intrusion into the porous bed layers was also monitored via an array of electrodes that measured temporal changes in the electrical resistance of the pore fluids. Results indicated that the temporal evolution of the gravity current front was slower over the CS and SG beds, compared to over the FS bed. Resistance measurements illustrated that the time scale for brine intrusion was comparable with the frontal propagationtime scales over the CS and SG beds, but was considerably longer within the FS bed runs.
Original languageEnglish
Typestudy
Publication statusPublished - 2016

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gravity
sand
sand and gravel
dense water
temporal evolution
laboratory
brine
gravel
electrode
timescale
fluid

Cite this

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title = "Laboratory study of dense gravity current propagation over porous bed layers",
abstract = "Results are presented for a series of laboratory experiments investigating the propagation characteristics of dense gravity currents over porous bed layers comprising of fine sand (FS), coarse sand (CS) and a sand-gravel (SG) mixture. Gravity currents were generated via a lock-release system and the resulting current propagation was measured by tracking the frontal position over time with high-resolution digital cameras. Dense water intrusion into the porous bed layers was also monitored via an array of electrodes that measured temporal changes in the electrical resistance of the pore fluids. Results indicated that the temporal evolution of the gravity current front was slower over the CS and SG beds, compared to over the FS bed. Resistance measurements illustrated that the time scale for brine intrusion was comparable with the frontal propagationtime scales over the CS and SG beds, but was considerably longer within the FS bed runs.",
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Laboratory study of dense gravity current propagation over porous bed layers. / Cuthbertson, Alan; Armour, Diane; Starrs, Gerard.

2016, study.

Research output: Other contribution

TY - GEN

T1 - Laboratory study of dense gravity current propagation over porous bed layers

AU - Cuthbertson, Alan

AU - Armour, Diane

AU - Starrs, Gerard

PY - 2016

Y1 - 2016

N2 - Results are presented for a series of laboratory experiments investigating the propagation characteristics of dense gravity currents over porous bed layers comprising of fine sand (FS), coarse sand (CS) and a sand-gravel (SG) mixture. Gravity currents were generated via a lock-release system and the resulting current propagation was measured by tracking the frontal position over time with high-resolution digital cameras. Dense water intrusion into the porous bed layers was also monitored via an array of electrodes that measured temporal changes in the electrical resistance of the pore fluids. Results indicated that the temporal evolution of the gravity current front was slower over the CS and SG beds, compared to over the FS bed. Resistance measurements illustrated that the time scale for brine intrusion was comparable with the frontal propagationtime scales over the CS and SG beds, but was considerably longer within the FS bed runs.

AB - Results are presented for a series of laboratory experiments investigating the propagation characteristics of dense gravity currents over porous bed layers comprising of fine sand (FS), coarse sand (CS) and a sand-gravel (SG) mixture. Gravity currents were generated via a lock-release system and the resulting current propagation was measured by tracking the frontal position over time with high-resolution digital cameras. Dense water intrusion into the porous bed layers was also monitored via an array of electrodes that measured temporal changes in the electrical resistance of the pore fluids. Results indicated that the temporal evolution of the gravity current front was slower over the CS and SG beds, compared to over the FS bed. Resistance measurements illustrated that the time scale for brine intrusion was comparable with the frontal propagationtime scales over the CS and SG beds, but was considerably longer within the FS bed runs.

M3 - Other contribution

ER -