Effect of different span heights on the pipeline impact forces induced by deep-sea landslides

Guo, Xingsen; Zheng, Defeng; Nian, Tingkai; Yin, Ping

doi:10.1016/j.apor.2019.03.009

Cited by 42 publications

(11 citation statements)

References 25 publications

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“…The fluid mechanics framework, however, mainly focuses on the inertial effects of the sliding mass impact on a pipeline (e.g. Pazwash and Robertson 1975;Chehata et al 2003;Zakeri et al 2008Zakeri et al , 2009Zakeri 2009;Liu et al 2015;Fan et al 2018;Guo et al 2019;Qian et al 2020), D r a f t which becomes dominant for a fast moving slide mass with low undrained strength (i.e., a relatively high Reynolds number, usually larger than 3). The hybrid geotechnical-fluid dynamics framework combines the above two mechanisms, by treating the interaction force components that arise from the viscous strength concept and the inertia separately (e.g.…”

Section: Existing Approaches For Evaluating Submarine Slide-pipeline ...mentioning

confidence: 99%

“…Ideally, the effects of the pipeline-seabed gap should be reflected in NH or CH parameters, which have been widely used in the studies reported by Zakeri et al (2008), Zakeri andHawlader (2013), andSahdi et al (2014). Guo et al (2019) and Zhang et al (2019) have reported and discussed this issue, but a more comprehensive understanding (especially the flow mechanism during the slide-pipeline interaction) and quantifications of the gap effects on the slide mass-pipeline interaction forces are needed.…”

Section: Existing Approaches For Evaluating Submarine Slide-pipeline ...mentioning

confidence: 99%

“…The potential threat of submarine slides on offshore infrastructures, such as submarine pipelines, has recently received much attention (e.g. Locat and Lee 2002;Wang and Miao 2008;Zakeri et al 2008Zakeri et al , 2009Zhu and Randolph 2010;Randolph and White 2012;Sahdi et al 2014;Yuan et al 2014;Liu et al 2015;Xiu et al 2015;Dong et al 2017;Nian et al 2018;Dutta and Hawlader 2019;Guo et al 2019;Zhang et al 2019;Fan et al 2019;Qian et al 2020), to ensure safe offshore developments. In particular, there have been a number of specialized international research initiatives [e.g.…”

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confidence: 99%

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Evaluation of horizontal submarine slide impact force on pipeline via a modified hybrid geotechnical – fluid dynamics framework

et al. 2022

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There are situations in offshore energy development where potential impact forces between submarine slides and pipelines need to be estimated. The horizontal slide-pipeline impact force, parallel to the main travel direction of the sliding mass and normal to the pipeline axis, is generally dominant compared to other force components, and hence of particular concern. In practice, pipelines may be suspended at varying distances above the seabed (gap) and existing methods do not consider how this will affect the horizontal slide-pipeline forces. This paper investigates the effects of pipeline-seabed gap and pipeline diameter on the horizontal slide-pipeline impact force via 181 computational fluid dynamics (CFD) simulations at Reynolds numbers of 0.36 - 287. Results show that variation in the pipeline-seabed gap and pipeline diameter alters the slide mass flow behavior as it flows past the pipeline and hence the impact force when the pipeline-seabed gap is below a critical value. A modified hybrid geotechnical-fluid dynamics framework for estimating the horizontal impact force is proposed by considering the effects of the pipeline-seabed gap and pipeline diameter, which is validated with existing experimental datasets.

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Section: Existing Approaches For Evaluating Submarine Slide-pipeline ...mentioning

confidence: 99%

Section: Existing Approaches For Evaluating Submarine Slide-pipeline ...mentioning

confidence: 99%

mentioning

confidence: 99%

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Evaluation of horizontal submarine slide impact force on pipeline via a modified hybrid geotechnical – fluid dynamics framework

et al. 2022

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“…Next, some researchers extended the previous works to study the normal and longitudinal interaction forces at different impact angles of submarine debris flows [23][24][25]. Afterwards, more factors on the drag force, such as suspension height [26][27][28], temperature of submarine debris flows [29], shape of the pipeline [30][31][32], strain-softening effects on soil strength [33], were also considered. In addition, some studies [34,35] used the material point method to investigate impact forces on pipelines, while an explanation of the mechanism of peak force was provided by [36,37].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques

Chen

Liao

2021

JMSE

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Offshore installations with pile foundations in shallow water are vulnerable to submarine landslides, which cause serious damage to engineering facilities, loss of life, and loss of money. Due to a shortage of real observation data and the difficulty of reproduction, we lack insight into the interaction behavior between submarine landslides and monopiles. This study capitalized on ANSYS Fluent 20.0 to develop a three-dimensional biphasic (water and slurry) numerical model. This CFD model was used to analyze the interaction between a monopile and submarine landslides at different flow heights. The velocities of submarine landslides were from low to high values. Two modes of interactional forces acting on the monopile are proposed, which are (i) interaction force with peak value and (ii) interaction force without peak value. The influence of flow height and velocity on interaction forces was investigated. Results show that the effect of the flow heights on the interaction force is significant at low velocity stage, while the peak force representing a hazard level of the pile was non-negligible under high flow velocity and low flow height conditions, which should be considered in a future study. The related mechanisms are revealed with a hybrid model considering different components of the force.

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“…Landslide-induced tsunami is a kind of natural hazard generated by a large mass fallen into the water in a basin, i.e., rivers, lakes, reservoirs, and oceans. This kind of tsunamis had been observed many times in history (Fritz et al 2009;Schiermeier 2017;Higman et al 2018), and some of these caused fatal consequences by overtopping dams, shorelines, and defensive structures (Dominey-Howes 2007;Gisler 2008;Del Ventisette et al 2015), and destroying constructions (Zakeri and Hawlader 2013;Guo et al 2019b). This fact has stimulated many researchers to investigate the formation and propagation of landslide-induced tsunamis, and the relative risk analysis on the coastal structures (Yavari-Ramshe and Ataie-Ashtiani 2016).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the hydrodynamic response of an impermeable sea-wall subjected to artificial submarine landslide-induced tsunamis

Deng

Cao

et al. 2021

Landslides

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Landslide-induced tsunamis are common natural hazards that potentially affect the safety and stability of waterfront structures. A numerical tank was constructed using FLOW-3D to investigate the hydrodynamic response of the sea-wall subjected to artificial submarine landslide-induced tsunamis, including the hydrodynamic load and wave run-up height. Initially, the landslideinduced tsunami model was calibrated using experiments to ensure high accuracy for capturing the free surface and obtaining the flow field information. Then, the sea-wall was added into the numerical tank to study the hydrodynamic response of the sea-wall. The results show that the artificial landslide successively generated two wave crests and that the hydrodynamic response of the seawall under the second crest was stronger than that under the first crest. Additionally, the effects of different influencing factors on the hydrodynamic response were discussed, respectively, and prediction equations for the hydrodynamic response considering these factors were proposed.

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Effect of different span heights on the pipeline impact forces induced by deep-sea landslides

Cited by 42 publications

References 25 publications

Evaluation of horizontal submarine slide impact force on pipeline via a modified hybrid geotechnical – fluid dynamics framework

Evaluation of horizontal submarine slide impact force on pipeline via a modified hybrid geotechnical – fluid dynamics framework

Numerical Study on Interaction between Submarine Landslides and a Monopile Using CFD Techniques

Numerical investigation of the hydrodynamic response of an impermeable sea-wall subjected to artificial submarine landslide-induced tsunamis

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