Flow and edge scour in current adjacent to stone covers

Thor U. Petersen, B. Mutlu Sumer, Jon Bøgelund, Asli Yazici, Jørgen Fredsøe, Knud Erik Meyer

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents the results of an experimental investigation on edge scour adjacent to a stone cover laid on a sandy bed. The three-dimensional flow over the edge of the stone layer has been investigated by the use of particle image velocimetry. The flow measurements show a significant amount of turbulence in the primary flow near the junction between the stone layer and the sand bed and the formation of complex secondary-flow structures. The results show that the flow and the edge scour process in a steady current are governed by the size of the roughness elements and to some extent the side slope of the berm. The edge scour is caused by the combined action of the primary flow and the secondary flow. The primary flow stirs up the sediment and puts it into suspension, and the secondary flow carries it away from the junction between the stone layer and the sand bed, resulting in a scour hole forming adjacent to the toe of the stone layer. The measured scour depth attained a constant level of approximately one times the stone size in the live-bed regime; further, the scour depth showed a slight decrease when the side slope of the berm was increased. Design diagrams are presented for the scour depth and the time scale of the scour process.
Original languageEnglish
Article number04014044
JournalJournal of Waterway, Port, Coastal, and Ocean Engineering
Volume141
Issue number4
Number of pages14
ISSN0733-950X
DOIs
Publication statusPublished - 2015

Cite this

Petersen, Thor U. ; Sumer, B. Mutlu ; Bøgelund, Jon ; Yazici, Asli ; Fredsøe, Jørgen ; Meyer, Knud Erik. / Flow and edge scour in current adjacent to stone covers. In: Journal of Waterway, Port, Coastal, and Ocean Engineering. 2015 ; Vol. 141, No. 4.
@article{0785d1b3a2584118abe02ab48afaff2e,
title = "Flow and edge scour in current adjacent to stone covers",
abstract = "This paper presents the results of an experimental investigation on edge scour adjacent to a stone cover laid on a sandy bed. The three-dimensional flow over the edge of the stone layer has been investigated by the use of particle image velocimetry. The flow measurements show a significant amount of turbulence in the primary flow near the junction between the stone layer and the sand bed and the formation of complex secondary-flow structures. The results show that the flow and the edge scour process in a steady current are governed by the size of the roughness elements and to some extent the side slope of the berm. The edge scour is caused by the combined action of the primary flow and the secondary flow. The primary flow stirs up the sediment and puts it into suspension, and the secondary flow carries it away from the junction between the stone layer and the sand bed, resulting in a scour hole forming adjacent to the toe of the stone layer. The measured scour depth attained a constant level of approximately one times the stone size in the live-bed regime; further, the scour depth showed a slight decrease when the side slope of the berm was increased. Design diagrams are presented for the scour depth and the time scale of the scour process.",
author = "Petersen, {Thor U.} and Sumer, {B. Mutlu} and Jon B{\o}gelund and Asli Yazici and J{\o}rgen Freds{\o}e and Meyer, {Knud Erik}",
year = "2015",
doi = "10.1061/(ASCE)WW.1943-5460.0000287",
language = "English",
volume = "141",
journal = "Journal of Waterway, Port, Coastal, and Ocean Engineering",
issn = "0733-950X",
publisher = "American Society of Civil Engineers",
number = "4",

}

Flow and edge scour in current adjacent to stone covers. / Petersen, Thor U. ; Sumer, B. Mutlu; Bøgelund, Jon ; Yazici, Asli ; Fredsøe, Jørgen; Meyer, Knud Erik.

In: Journal of Waterway, Port, Coastal, and Ocean Engineering, Vol. 141, No. 4, 04014044, 2015.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Flow and edge scour in current adjacent to stone covers

AU - Petersen, Thor U.

AU - Sumer, B. Mutlu

AU - Bøgelund, Jon

AU - Yazici, Asli

AU - Fredsøe, Jørgen

AU - Meyer, Knud Erik

PY - 2015

Y1 - 2015

N2 - This paper presents the results of an experimental investigation on edge scour adjacent to a stone cover laid on a sandy bed. The three-dimensional flow over the edge of the stone layer has been investigated by the use of particle image velocimetry. The flow measurements show a significant amount of turbulence in the primary flow near the junction between the stone layer and the sand bed and the formation of complex secondary-flow structures. The results show that the flow and the edge scour process in a steady current are governed by the size of the roughness elements and to some extent the side slope of the berm. The edge scour is caused by the combined action of the primary flow and the secondary flow. The primary flow stirs up the sediment and puts it into suspension, and the secondary flow carries it away from the junction between the stone layer and the sand bed, resulting in a scour hole forming adjacent to the toe of the stone layer. The measured scour depth attained a constant level of approximately one times the stone size in the live-bed regime; further, the scour depth showed a slight decrease when the side slope of the berm was increased. Design diagrams are presented for the scour depth and the time scale of the scour process.

AB - This paper presents the results of an experimental investigation on edge scour adjacent to a stone cover laid on a sandy bed. The three-dimensional flow over the edge of the stone layer has been investigated by the use of particle image velocimetry. The flow measurements show a significant amount of turbulence in the primary flow near the junction between the stone layer and the sand bed and the formation of complex secondary-flow structures. The results show that the flow and the edge scour process in a steady current are governed by the size of the roughness elements and to some extent the side slope of the berm. The edge scour is caused by the combined action of the primary flow and the secondary flow. The primary flow stirs up the sediment and puts it into suspension, and the secondary flow carries it away from the junction between the stone layer and the sand bed, resulting in a scour hole forming adjacent to the toe of the stone layer. The measured scour depth attained a constant level of approximately one times the stone size in the live-bed regime; further, the scour depth showed a slight decrease when the side slope of the berm was increased. Design diagrams are presented for the scour depth and the time scale of the scour process.

U2 - 10.1061/(ASCE)WW.1943-5460.0000287

DO - 10.1061/(ASCE)WW.1943-5460.0000287

M3 - Journal article

VL - 141

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

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

SN - 0733-950X

IS - 4

M1 - 04014044

ER -