Generalized time scale for wave-induced backfilling beneath submarine pipelines

Kim Bastian, Stefan Carstensen, Titi Sui, David R. Fuhrman*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents 25 new laboratory experiments involving the wave-induced backfilling of wave-induced scour holes beneath submarine pipelines (so-called wave-to-wave backfilling scenarios). The experiments complement the previous 8 wave-to-wave backfilling experiments of Fredsøe et al., as well as recent current-to-wave backfilling experiments of Bayraktar et al. It is found that the wave-induced backfilling time scale is generally an order of magnitude larger than for scour, and is relatively insensitive to the initial (current- or wave-induced) pre-backfilling scour profile. Based on this, the data sets involving wave-induced backfilling are collectively analyzed, resulting in a new generalized expression for estimating the wave-induced backfilling time scale beneath pipelines in the live-bed regime. This expression accounts for primary dependence on the Shields parameter, as well as secondary dependence based on the difference between the (estimated or known) initial and expected final equilibrium scour depth due to the backfilling wave condition.
Original languageEnglish
JournalCoastal engineering
Volume143
Pages (from-to)113-122
Number of pages10
ISSN0378-3839
DOIs
Publication statusPublished - 2019

Keywords

  • Scour
  • Backfilling
  • Pipelines
  • Sediment transport
  • Time scale
  • Steady current
  • Waves

Cite this

@article{933648025d9e4d038928a9e664b30d95,
title = "Generalized time scale for wave-induced backfilling beneath submarine pipelines",
abstract = "This paper presents 25 new laboratory experiments involving the wave-induced backfilling of wave-induced scour holes beneath submarine pipelines (so-called wave-to-wave backfilling scenarios). The experiments complement the previous 8 wave-to-wave backfilling experiments of Freds{\o}e et al., as well as recent current-to-wave backfilling experiments of Bayraktar et al. It is found that the wave-induced backfilling time scale is generally an order of magnitude larger than for scour, and is relatively insensitive to the initial (current- or wave-induced) pre-backfilling scour profile. Based on this, the data sets involving wave-induced backfilling are collectively analyzed, resulting in a new generalized expression for estimating the wave-induced backfilling time scale beneath pipelines in the live-bed regime. This expression accounts for primary dependence on the Shields parameter, as well as secondary dependence based on the difference between the (estimated or known) initial and expected final equilibrium scour depth due to the backfilling wave condition.",
keywords = "Scour, Backfilling, Pipelines, Sediment transport, Time scale, Steady current, Waves",
author = "Kim Bastian and Stefan Carstensen and Titi Sui and Fuhrman, {David R.}",
year = "2019",
doi = "10.1016/j.coastaleng.2018.10.001",
language = "English",
volume = "143",
pages = "113--122",
journal = "Coastal Engineering",
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publisher = "Elsevier",

}

Generalized time scale for wave-induced backfilling beneath submarine pipelines. / Bastian, Kim; Carstensen, Stefan; Sui, Titi; Fuhrman, David R.

In: Coastal engineering, Vol. 143, 2019, p. 113-122.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Generalized time scale for wave-induced backfilling beneath submarine pipelines

AU - Bastian, Kim

AU - Carstensen, Stefan

AU - Sui, Titi

AU - Fuhrman, David R.

PY - 2019

Y1 - 2019

N2 - This paper presents 25 new laboratory experiments involving the wave-induced backfilling of wave-induced scour holes beneath submarine pipelines (so-called wave-to-wave backfilling scenarios). The experiments complement the previous 8 wave-to-wave backfilling experiments of Fredsøe et al., as well as recent current-to-wave backfilling experiments of Bayraktar et al. It is found that the wave-induced backfilling time scale is generally an order of magnitude larger than for scour, and is relatively insensitive to the initial (current- or wave-induced) pre-backfilling scour profile. Based on this, the data sets involving wave-induced backfilling are collectively analyzed, resulting in a new generalized expression for estimating the wave-induced backfilling time scale beneath pipelines in the live-bed regime. This expression accounts for primary dependence on the Shields parameter, as well as secondary dependence based on the difference between the (estimated or known) initial and expected final equilibrium scour depth due to the backfilling wave condition.

AB - This paper presents 25 new laboratory experiments involving the wave-induced backfilling of wave-induced scour holes beneath submarine pipelines (so-called wave-to-wave backfilling scenarios). The experiments complement the previous 8 wave-to-wave backfilling experiments of Fredsøe et al., as well as recent current-to-wave backfilling experiments of Bayraktar et al. It is found that the wave-induced backfilling time scale is generally an order of magnitude larger than for scour, and is relatively insensitive to the initial (current- or wave-induced) pre-backfilling scour profile. Based on this, the data sets involving wave-induced backfilling are collectively analyzed, resulting in a new generalized expression for estimating the wave-induced backfilling time scale beneath pipelines in the live-bed regime. This expression accounts for primary dependence on the Shields parameter, as well as secondary dependence based on the difference between the (estimated or known) initial and expected final equilibrium scour depth due to the backfilling wave condition.

KW - Scour

KW - Backfilling

KW - Pipelines

KW - Sediment transport

KW - Time scale

KW - Steady current

KW - Waves

U2 - 10.1016/j.coastaleng.2018.10.001

DO - 10.1016/j.coastaleng.2018.10.001

M3 - Journal article

VL - 143

SP - 113

EP - 122

JO - Coastal Engineering

JF - Coastal Engineering

SN - 0378-3839

ER -