Scour at Vertical Piles in Sand-Clay Mixtures under Waves

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Scour at Vertical Piles in Sand-Clay Mixtures under Waves. / Dey, Subhasish; Helkjær, Anders; Sumer, B. Mutlu; Fredsøe, Jørgen.

In: Journal of Waterway, Port, Coastal, and Ocean Engineering, Vol. 137, No. 6, 2011, p. 324-331.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

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Author

Dey, Subhasish; Helkjær, Anders; Sumer, B. Mutlu; Fredsøe, Jørgen / Scour at Vertical Piles in Sand-Clay Mixtures under Waves.

In: Journal of Waterway, Port, Coastal, and Ocean Engineering, Vol. 137, No. 6, 2011, p. 324-331.

Publication: Research - peer-reviewJournal article – Annual report year: 2011

Bibtex

@article{5d09dbb531bc47228be7c5ccc20e681b,
title = "Scour at Vertical Piles in Sand-Clay Mixtures under Waves",
publisher = "American Society of Civil Engineers",
author = "Subhasish Dey and Anders Helkjær and Sumer, {B. Mutlu} and Jørgen Fredsøe",
year = "2011",
doi = "10.1061/(ASCE)WW.1943-5460.0000095",
volume = "137",
number = "6",
pages = "324--331",
journal = "Journal of Waterway, Port, Coastal, and Ocean Engineering",
issn = "0733-950X",

}

RIS

TY - JOUR

T1 - Scour at Vertical Piles in Sand-Clay Mixtures under Waves

A1 - Dey,Subhasish

A1 - Helkjær,Anders

A1 - Sumer,B. Mutlu

A1 - Fredsøe,Jørgen

AU - Dey,Subhasish

AU - Helkjær,Anders

AU - Sumer,B. Mutlu

AU - Fredsøe,Jørgen

PB - American Society of Civil Engineers

PY - 2011

Y1 - 2011

N2 - Marine sediments often contain sand-clay mixtures in widely varying proportions. This study presents the results of equilibrium scour and time variation of scour depths at circular piles embedded vertically in clay alone and sand-clay mixed beds under waves. Experiments were conducted in a wave flume with different proportions of sand-clay mixtures as bed sediments. Test results for the cases of steady current and sand alone under waves are used as references. The equilibrium scour depth reduces with an increase in clay proportion n (by weight) in a sand-clay mixture. Interestingly, the scour depth reductions for n=0.3 and 1 are almost equal, suggesting that when the clay proportion in a sand-clay mixture becomes 0.3, the sand-clay mixture behaves as if it were a clay-alone mixture, in relation to scour depths. The dependency of equilibrium scour depth on the Keulegan-Carpenter number for different n-values can be expressed by an exponential law, using different coefficients and exponents. For time variation of scour, the nondimensional timescale increases with an increase in Keulegan-Carpenter number and clay proportion. However, unlike the near-equal scour depths, timescales are quite different for n=0.3 and 1. © 2011 American Society of Civil Engineers.

AB - Marine sediments often contain sand-clay mixtures in widely varying proportions. This study presents the results of equilibrium scour and time variation of scour depths at circular piles embedded vertically in clay alone and sand-clay mixed beds under waves. Experiments were conducted in a wave flume with different proportions of sand-clay mixtures as bed sediments. Test results for the cases of steady current and sand alone under waves are used as references. The equilibrium scour depth reduces with an increase in clay proportion n (by weight) in a sand-clay mixture. Interestingly, the scour depth reductions for n=0.3 and 1 are almost equal, suggesting that when the clay proportion in a sand-clay mixture becomes 0.3, the sand-clay mixture behaves as if it were a clay-alone mixture, in relation to scour depths. The dependency of equilibrium scour depth on the Keulegan-Carpenter number for different n-values can be expressed by an exponential law, using different coefficients and exponents. For time variation of scour, the nondimensional timescale increases with an increase in Keulegan-Carpenter number and clay proportion. However, unlike the near-equal scour depths, timescales are quite different for n=0.3 and 1. © 2011 American Society of Civil Engineers.

KW - Piles

KW - Hydraulics

KW - Erosion

KW - Water waves

KW - Scour

KW - Wave velocity

KW - Clays

U2 - 10.1061/(ASCE)WW.1943-5460.0000095

DO - 10.1061/(ASCE)WW.1943-5460.0000095

JO - Journal of Waterway, Port, Coastal, and Ocean Engineering

JF - Journal of Waterway, Port, Coastal, and Ocean Engineering

SN - 0733-950X

IS - 6

VL - 137

SP - 324

EP - 331

ER -