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Predicting scour beneath subsea pipelines from existing small free span depths under steady currents

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Lee, JY ORCID: 0000-0001-5884-7077, McInerney, J, Cossu, R, Leong, ZQ ORCID: 0000-0002-0644-1822 and Forrest, AL ORCID: 0000-0002-7853-9765 2017 , 'Predicting scour beneath subsea pipelines from existing small free span depths under steady currents' , Journal of Ocean Engineering and Science, vol. 2, no. 2 , pp. 61-75 , doi: 10.1016/j.joes.2017.03.001.

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Abstract

An equation was developed to predict current-induced scour beneath subsea pipelines in areaswith small span depths, S. Current equations for scour prediction are only applicable topartially buried pipelines. The existence of small span depths (i.e. S/D S/D. Full-scale two-dimensional Computational Fluid Dynamics (CFD) simulations wereperformed using the Reynolds-averaged Navier–Stokes approach and the Shear StressTransport k-ω turbulence model. To predict the occurrence of scour, the computed maximumbed shear stress beneath the pipe was converted to the dimensionless Shields parameter, andcompared with the critical Shields parameter based on the mean sediment grain size. Thenumerical setup was verified, and a good agreement was found between model-scale CFDdata and experimental data. Field data were obtained to determine the mean grain size, farfield current velocity and to measure the span depths along the surveyed pipe length. A trendline equation was fitted to the full-scale CFD data, whereby the maximum Shields parameterbeneath the pipe can be calculated based on the undisturbed Shields parameter and S/D.

Item Type: Article
Authors/Creators:Lee, JY and McInerney, J and Cossu, R and Leong, ZQ and Forrest, AL
Keywords: sediment scour, subsea pipelines, small span depths, steady currents
Journal or Publication Title: Journal of Ocean Engineering and Science
Publisher: Elsevier
ISSN: 2468-0133
DOI / ID Number: 10.1016/j.joes.2017.03.001
Copyright Information:

Copyright 2017 Shanghai Jiaotong University. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/

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