Submarine debris flow impact on pipelines — Part I: Experimental investigation

Zakeri, Arash; Höeg, Kaare; Nadim, Farrokh

doi:10.1016/j.coastaleng.2008.06.003

Cited by 129 publications

(70 citation statements)

References 20 publications

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“…The drag factor, C D , can then be represented by an empirical correlation (Zakeri et al, 2008Zakeri, 2009) as…”

Section: Introductionmentioning

confidence: 99%

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Centrifuge modelling of active slide–pipeline loading in soft clay

Sahdi¹,

Gaudin²,

White³

et al. 2014

Géotechnique

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Submarine slides are a significant hazard to the safe operation of pipelines in the proximity of continental slopes. This paper describes the results of a centrifuge testing programme aimed at studying the impact forces exerted by a submarine slide on an offshore pipeline. This was achieved by dragging a model pipe at varying velocities through fine-grained soil at various degrees of consolidation, hence exhibiting properties spanning from the fluid to the geotechnical domains, relevant to the state of submarine slide material. To simulate the high strain rates experienced by the soil while flowing around a pipe in the path of a submarine slide, tests were conducted at pipe-soil velocities of up to 4 . 2 m/s. The changing density and shear strength of the samples were back-calculated from T-bar penetrometer test results. A hybrid approach combining geotechnical and fluid-mechanics-based components of horizontal drag resistance was developed. This approach provides an improved method to link the density and strength of the slide material to the force applied on the pipe. Besides fitting the present observations, the method provides an improved reinterpretation of similar data from the literature.

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“…The drag factor, C D , can then be represented by an empirical correlation (Zakeri et al, 2008Zakeri, 2009) as…”

Section: Introductionmentioning

confidence: 99%

“…The above equation was calibrated from experimental tests in a flume (Zakeri et al, 2008) coupled with computational fluid dynamics analyses ) simulating debris flow impacting on a suspended pipeline.…”

Section: Introductionmentioning

confidence: 99%

Centrifuge modelling of active slide–pipeline loading in soft clay

Sahdi¹,

Gaudin²,

White³

et al. 2014

Géotechnique

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“…They can also have a central role in the formation of hydrocarbon reservoirs 1,9 and they can impact the stability of submarine structures placed at the sea-floor like pipelines or submarine's cables. 10,11 It is clear that understanding the physical mechanism associated with these currents as well as the correct prediction of their main features is of great importance for practical and theoretical purposes. One of the key features of turbidity currents is the lobe-and-cleft structures located at the head of the current.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity simulations of the lobe-and-cleft structures and the deposition map in particle-driven gravity currents

et al. 2015

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The evolution of a mono-disperse gravity current in the lock-exchange configuration is investigated by means of direct numerical simulations for various Reynolds numbers and settling velocities for the deposition. We limit our investigations to gravity currents over a flat bed in which density differences are small enough for the Boussinesq approximation to be valid. The concentration of particles is described in an Eulerian fashion by using a transport equation combined with the incompressible Navier-Stokes equations. The most interesting results can be summarized as follows: (i) the settling velocity is affecting the streamwise vortices at the head of the current with a substantial reduction of their size when the settling velocity is increased; (ii) when the Reynolds number is increased the lobe-and-cleft structures are merging more frequently and earlier in time, suggesting a strong Reynolds number dependence for the spatio-temporal evolution of the head of the current; (iii) the temporal imprint of the lobe-and-cleft structures can be recovered from the deposition map, suggesting that the deposition pattern is defined purely and exclusively by the structures at the front of the current.

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“…Understanding this postfailure dynamics has an important applied perspective as this may help determine the number of structures that may be put at risk along the path of a submarine slope failure, or control the design parameters for submarine pipelines that need to resist the impact of sediment gravity flows. Flume experiments (Zakeri et al 2008) and centrifuge models (Chi and Zakeri, this volume) have been used to derive power function equations and model parameters that can be used to this end. Sassa and Sekiguchi (this volume) present an analytical framework that simulates the dynamics of subaqueous liquefied sediment flows leading to redeposition on the basis of twophase physics.…”

Section: Part V: Post-failure Dynamicsmentioning

confidence: 99%