Scour below a subsea pipeline in time varying flow conditions

Qin Zhang; Scott Draper; Liang Cheng; Hongwei An

doi:10.1016/j.apor.2015.10.003

Scour below a subsea pipeline in time varying flow conditions

Qin Zhang, Scott Draper, Liang Cheng, Hongwei An

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Abstract

© 2015 Elsevier Ltd. This paper presents results of an experimental investigation into the time scale of local scour and backfill for a subsea pipeline in changing flow conditions, modelled as two consecutive but different flow conditions and as uniformly increasing flow velocities. Unidirectional current flow, waves and combined waves and current flow are all considered. Based on the results of the experiments, effective time scales of the scour and backfill are quantified and algorithms to predict the scour process in changing flow conditions are derived by accumulating the effects of the different flow conditions. It is found that these algorithms may be used to predict the scour observed in the experimental data reasonably well.

Original language	English
Pages (from-to)	151-162
Number of pages	12
Journal	Applied Ocean Research
Volume	55
Early online date	7 Jan 2016
DOIs	https://doi.org/10.1016/j.apor.2015.10.003
Publication status	Published - 1 Feb 2016

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10.1016/j.apor.2015.10.003

Zhang et al., 2016 Scour below a subsea pipeline in time varying flow conditions
© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 6.95 MBLicence: CC BY-NC-ND

Cite this

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title = "Scour below a subsea pipeline in time varying flow conditions",

abstract = "{\textcopyright} 2015 Elsevier Ltd. This paper presents results of an experimental investigation into the time scale of local scour and backfill for a subsea pipeline in changing flow conditions, modelled as two consecutive but different flow conditions and as uniformly increasing flow velocities. Unidirectional current flow, waves and combined waves and current flow are all considered. Based on the results of the experiments, effective time scales of the scour and backfill are quantified and algorithms to predict the scour process in changing flow conditions are derived by accumulating the effects of the different flow conditions. It is found that these algorithms may be used to predict the scour observed in the experimental data reasonably well.",

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AU - Zhang, Qin

AU - Draper, Scott

AU - Cheng, Liang

AU - An, Hongwei

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N2 - © 2015 Elsevier Ltd. This paper presents results of an experimental investigation into the time scale of local scour and backfill for a subsea pipeline in changing flow conditions, modelled as two consecutive but different flow conditions and as uniformly increasing flow velocities. Unidirectional current flow, waves and combined waves and current flow are all considered. Based on the results of the experiments, effective time scales of the scour and backfill are quantified and algorithms to predict the scour process in changing flow conditions are derived by accumulating the effects of the different flow conditions. It is found that these algorithms may be used to predict the scour observed in the experimental data reasonably well.

AB - © 2015 Elsevier Ltd. This paper presents results of an experimental investigation into the time scale of local scour and backfill for a subsea pipeline in changing flow conditions, modelled as two consecutive but different flow conditions and as uniformly increasing flow velocities. Unidirectional current flow, waves and combined waves and current flow are all considered. Based on the results of the experiments, effective time scales of the scour and backfill are quantified and algorithms to predict the scour process in changing flow conditions are derived by accumulating the effects of the different flow conditions. It is found that these algorithms may be used to predict the scour observed in the experimental data reasonably well.

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DO - 10.1016/j.apor.2015.10.003

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JO - Applied Ocean Research

JF - Applied Ocean Research

ER -

Scour below a subsea pipeline in time varying flow conditions

Abstract

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