Prediction of Hydrodynamic Forces on Seabed Pipelines

Verley, Richard; Lambrakos, Kostas F.; Reed, Knut

doi:10.4043/5503-ms

Cited by 12 publications

(2 citation statements)

References 3 publications

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“…As a reference, corresponding velocity values of currents other than turbidity flows, such as tidal or wave induced currents, are usually below 1 m/s [e.g., Lambrakos , 1982; Verley et al , 1987; Lambrakos et al , 1987].…”

Section: Application Of the New Modelmentioning

confidence: 99%

Estimating turbidity current conditions from channel morphology: A Froude number approach

Sequeiros¹

2012

J. Geophys. Res.

107

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[1] There is a growing need across different disciplines to develop better predictive tools for flow conditions of density and turbidity currents. Apart from resorting to complex numerical modeling or expensive field measurements, little is known about how to estimate gravity flow parameters from scarce available data and how they relate to each other. This study presents a new method to estimate normal flow conditions of gravity flows from channel morphology based on an extensive data set of laboratory and field measurements. The compilation consists of 78 published works containing 1092 combined measurements of velocity and concentration of gravity flows dating as far back as the early 1950s. Because the available data do not span all ranges of the critical parameters, such as bottom slope, a validated Reynolds-averaged Navier-Stokes (RANS) k-ɛ numerical model is used to cover the gaps. It is shown that gravity flows fall within a range of Froude numbers spanning 1 order of magnitude centered on unity, as opposed to rivers and open-channel flows which extend to a much wider range. It is also observed that the transition from subcritical to supercritical flow regime occurs around a slope of 1%, with a spread caused by parameters other than the bed slope, like friction and suspended sediment settling velocity. The method is based on a set of equations relating Froude number to bed slope, combined friction, suspended material, and other flow parameters. The applications range from quick estimations of gravity flow conditions to improved numerical modeling and back calculation of missing parameters. A real case scenario of turbidity current estimation from a submarine canyon off the Nigerian coast is provided as an example.

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Section: Application Of the New Modelmentioning

confidence: 99%

Estimating turbidity current conditions from channel morphology: A Froude number approach

Sequeiros¹

2012

J. Geophys. Res.

107

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“…Most of the previous studies on wave forcing on submarine pipes were concerned with unburied pipes, with or without close proximity to the seabed (e.g. Sarpakaya 1976, Verley et al 1987. Ismail et al (1986) reviewed the very limited data available on wave loading on partially-buried pipes and stressed the need for detailed measurements of both the hydrodynamic forces as well as the seepage-flow loading on partially-buried marine pipes.…”

Section: Introductionmentioning

confidence: 99%

Wave-Induced Breakout of Half-Buried Marine Pipes

Foda

Law

Chang

1988

Int. Conf. Coastal. Eng.

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An experimental study is conducted in order to identify the major physical processes leading to the breakout of half-buried submarine pipelines from the seafloor under ocean wave action. Both the hydrodynamic loading on the exposed surface of the pipe, as well as the resulting displacement history of the pipe, were recorded and analyzed in order to identify the critical pipe-soil-wave conditions for the detachment of the pipe from the seabed. The paper also examines the balance of the pipe under the combined lift and drag loading from the water wave. An experimental breakout force-time power law is obtained and compared to available theoretical breakout models.

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