Numerical Modelling of Runout and Velocity for Slide-Induced Submarine Density Flows: A Building Block of an Integrated Geohazards Assessment for Deepwater Developments

Spinewine, Benoît; Rensonnet, Delphine; Clare, Michael; Capart, Hervé; Thier, Thibaud De; Dan-Unterseh, G.

doi:10.4043/24180-ms

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Modeling of flows translates hazard to risk by quantifying the impact stresses on structures (Spinewine et al, 2013), but should only be performed once a credible estimate of input parameters has been made, otherwise it may be unrepresentative. It is crucial to ensure that accurate geohazard scenarios are developed for a credible assessment of geohazard impact and this requires integration -not just of data sets, but between different disciplinary specialists on a live project basis.…”

Section: Discussionmentioning

confidence: 99%

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Sediment Density Flow Impact Assessment and Mitigation Studies for Deepwater Developments: A Challenge on Multiple Scales

Clare

Thomas

Spinewine³

2013

All Days

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A unified and verifiable approach is outlined for the assessment of submarine sediment density flows (debris flows, high density and dilute turbidity currents) providing diagnostic criteria of their previous occurrence to inform forward-looking analyses. The assessment outlined includes development of: Evolutionary geological model, summarizing temporal, geological and climatic controls on specific flow types, and estimations of recurrence intervals; Terrain model to understand regional to macro-scale spatial controls on flow dynamics, feasible geometries and predicted aspect of flows to structures; Sedimentary facies model to determine flow behaviour and evolution based on sedimentological analysis and interpretation of high resolution seismic data.Crucial factors that influence the nature and magnitude of density flows include: the original initiation event (volume, sediment type and triggering mechanism); interrelationship of slope systems, such as downslope coalescence and densification of flows; degree of confinement caused by the seafloor relief; and the influence of local seafloor gradient. These factors may modify the downslope evolution of a flow from that predicted by conventional models. Examples are shown that may challenge preconceptions of flow dynamics, and outline how geological observations should be integrated to provide robust inputs prior to performing numerical modeling.Case studies are presented from regional to millimetric scale, to summarize key observations that should be used to infer credible flow type, density, direction and magnitude, and are related to recommendations for modeling that may ultimately be translated to a vulnerability assessment. In particular, key metrics for flow characterization that can be derived from sedimentological analysis and interpretation of deposit morphology are discussed, as well as application and limitations of modeling techniques for different flow types.Submarine sediment density flows occur in many environments worldwide that are being exploited for hydrocarbons and traversed by infrastructure associated with telecommunications and energy transport. Apparently subtle variations, on a variety of scales, may affect the nature of flows and, thus the type and magnitude of impact on subsea structures. Without detailed calibration and understanding of systems as a whole, the inputs that are fed in to geomechanical, hydrodynamic and vulnerability models may be misleading or unrepresentative of real-life conditions.

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Section: Discussionmentioning

confidence: 99%

“…Spinewine et al 2013). While the characterization above is based on sound geological, geophysical and geotechnical observations, any assessment of impact or damage will be qualitative or semiquantitative at best.…”

Section: Methodsmentioning

confidence: 99%

Sediment Density Flow Impact Assessment and Mitigation Studies for Deepwater Developments: A Challenge on Multiple Scales

Clare

Thomas

Spinewine³

2013

All Days

Self Cite

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“…Therefore, avoidance of hazardous areas is preferred but is not always an option. Exploitation of new hydrocarbon reserves and the global networking of seafloor cables necessitate the crossing of deep-water settings, prone to a range of marine geohazards that can adversely affect seafloor infrastructure (Thomas, Hooper and Clare 2010;Spinewine et al 2013). Thus, we need to understand and mitigate the risk posed by marine geohazards to strategically important seafloor infrastructure (Campbell 1999).…”

Section: How Are Marine Geohazards Typically Assessed?mentioning

confidence: 99%

Direct monitoring of active geohazards: emerging geophysical tools for deep‐water assessments

Clare

Vardy

Cartigny

et al. 2017

Near Surface Geophysics

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Seafloor networks of cables, pipelines, and other infrastructure underpin our daily lives, providing communication links, information, and energy supplies. Despite their global importance, these networks are vulnerable to damage by a number of natural seafloor hazards, including landslides, turbidity currents, fluid flow, and scour. Conventional geophysical techniques, such as high‐resolution reflection seismic and side‐scan sonar, are commonly employed in geohazard assessments. These conventional tools provide essential information for route planning and design; however, such surveys provide only indirect evidence of past processes and do not observe or measure the geohazard itself. As such, many numerical‐based impact models lack field‐scale calibration, and much uncertainty exists about the triggers, nature, and frequency of deep‐water geohazards. Recent advances in technology now enable a step change in their understanding through direct monitoring. We outline some emerging monitoring tools and how they can quantify key parameters for deep‐water geohazard assessment. Repeat seafloor surveys in dynamic areas show that solely relying on evidence from past deposits can lead to an under‐representation of the geohazard events. Acoustic Doppler current profiling provides new insights into the structure of turbidity currents, whereas instrumented mobile sensors record the nature of movement at the base of those flows for the first time. Existing and bespoke cabled networks enable high bandwidth, low power, and distributed measurements of parameters such as strain across large areas of seafloor. These techniques provide valuable new measurements that will improve geohazard assessments and should be deployed in a complementary manner alongside conventional geophysical tools.

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Efficient curvature-constrained least cost route optimization on parallel architectures

Blaise¹,

Spinewine²

2021

Engineering with Computers

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Numerical Modelling of Runout and Velocity for Slide-Induced Submarine Density Flows: A Building Block of an Integrated Geohazards Assessment for Deepwater Developments

Cited by 9 publications

References 14 publications

Sediment Density Flow Impact Assessment and Mitigation Studies for Deepwater Developments: A Challenge on Multiple Scales

Sediment Density Flow Impact Assessment and Mitigation Studies for Deepwater Developments: A Challenge on Multiple Scales

Direct monitoring of active geohazards: emerging geophysical tools for deep‐water assessments

Efficient curvature-constrained least cost route optimization on parallel architectures

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