Advancing from subaqueous mass movement case studies to providing advice and mitigation

Lintern, Gwyn; Mosher, D.; Scherwath, Martin

doi:10.1144/sp477-2018-190

Cited by 5 publications

(10 citation statements)

References 88 publications

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“…Monitoring turbidity currents poses several challenges because deploying instruments on the deep seafloor is logistically challenging, flows may occur infrequently, and the powerful nature of flows can damage the instruments intended to measure them (e.g. Inman et al, 1976;Talling et al, 2013;Puig et al, 2014;Clare et al, 2017;Lintern et al, 2019). Despite these challenges, several studies have prevailed to provide direct measurements of turbidity currents, including seminal field campaigns using point current meters (that measured velocity at one elevation in the water column), in settings ranging from active river-fed fjords (Hay et al, 1982Prior et al, 1987;Syvitski and Hein, 1991;Bornhold et al, 1994), lakes (Lambert and Giavanoli, 1988) and deep-sea submarine canyons (Inman et al 1976;Shepard et al, 1977;Khripounoff et al, 2003Khripounoff et al, , 2009Vangriesheim et al, 2009).…”

Section: A Very Brief History Of Monitoring Turbidity Currentsmentioning

confidence: 99%

“…Modern turbidity current monitoring campaigns typically integrate multiple sensors and tools, such as multi-beam sonar (imaging the water column), optical back-scatter sensors (to detect suspended particles), acoustic monitoring transponders (to determine seafloor movement), sediment traps (to collect suspended sediment) (Lintern and Hill, 2010;Xu, 2011;Khripounoff et al, 2012;Hughes Clarke, 2016;Lintern et al, 2016;Clare et al, 2017;Paull et al, 2018;Lintern et al, 2019;Hage et al, 2019;Maier et al, 2019a&b). The tools that can be used to measure turbidity currents are partly covered by a number of reviews (Xu, 2011;Talling et al, 2013;Puig et al, 2014;Clare et al, 2017).…”

Section: A Very Brief History Of Monitoring Turbidity Currentsmentioning

confidence: 99%

“…This revised deployment included arms and poles that held instruments away from the platform and above the 2 m powerful flows that were detected (Lintern et al, 2019). It also featured feet that snap free on retrieval, as embedment of the original large feet created problems during recovery ( Figure 6B).…”

Section: A C C E P T E Dmentioning

confidence: 99%

“…This may be possible for moored systems when reliable methods of reconditional sampling can be developed, to record at high bandwidth only during turbidity currents; however, research is still required in this area. Experience at the Fraser Delta has demonstrated that it is possible to design a cabled seafloor observatory that is capable of withstanding powerful turbidity currents and can transmit data in real time (Lintern et al, 2019). In many settings, such as the Fraser Delta, turbidity currents occur only at certain times of the year, and extreme flows may occur years apart.…”

Section: Seafloor Platforms and Cabled Observatoriesmentioning

confidence: 99%

“…Cabled instruments report live to shore; hence event detection is possible, which might enable a response to investigate conditions shortly after the event (as was the case of Lintern et al, 2016). Due to the array of instruments on the network, the exact environmental conditions under which turbidity currents occur are well understood at the Fraser Delta (strong freshet combined with spring tides), and their onset can be reliably predicted (Lintern et al, 2019).…”

Section: Seafloor Platforms and Cabled Observatoriesmentioning

confidence: 99%

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Lessons learned from the monitoring of turbidity currents and guidance for future platform designs

Clare

Lintern

Rosenberger³

et al. 2020

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Turbidity currents transport globally significant volumes of sediment and organic carbon into the deep-sea and pose a hazard to critical infrastructure. Despite advances in technology, their powerful nature often damages expensive instruments placed in their path. These challenges mean that turbidity currents have only been measured in a few locations worldwide, in relatively shallow water depths (<<2 km). Here, we share lessons from recent field deployments about how to design the platforms on which instruments are deployed. First, we show how monitoring platforms have been affected by turbidity currents including instability, displacement, tumbling and damage. Second, we relate these issues to specifics of the platform design, such as exposure of large surface area instruments within a flow and inadequate anchoring or seafloor support. Third, we provide recommended improvements to improve design by simplifying mooring configurations, minimising surface area, and enhancing seafloor stability. Finally we highlight novel multi-point moorings that avoid interaction between the instruments and the flow, and flow-resilient seafloor platforms with innovative engineering design features, such as ejectable feet and ballast. Our experience will provide guidance for future deployments, so that more detailed insights can be provided into turbidity current behaviour, and in a wider range of settings.

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Section: A Very Brief History Of Monitoring Turbidity Currentsmentioning

confidence: 99%

Section: A Very Brief History Of Monitoring Turbidity Currentsmentioning

confidence: 99%

Section: A C C E P T E Dmentioning

confidence: 99%

Section: Seafloor Platforms and Cabled Observatoriesmentioning

confidence: 99%

Section: Seafloor Platforms and Cabled Observatoriesmentioning

confidence: 99%

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Lessons learned from the monitoring of turbidity currents and guidance for future platform designs

Clare

Lintern

Rosenberger³

et al. 2020

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Line length balancing to evaluate multi-phase submarine landslide development: an example from the Storegga Slide, Norway

Bull

Cartwright

2020

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This study shows how simple structural restoration of a discrete submarine landslide lobe can be applied to large-scale, multi-phase examples to identify different phases of slide-lobe development and evaluate their mode of emplacement. We present the most detailed analysis performed to date on a zone of intense contractional deformation, historically referred to as the compression zone, from the giant, multi-phase Storegga Slide, offshore Norway. 2D and 3D seismic data and bathymetry data show that the zone of large-scale (>650 m thick) contractional deformation can be genetically linked updip with a zone of intense depletion across a distance of 135 km. Quantification of depletion and accumulation along a representative dip-section reveals that significant depletion in the proximal region is not accommodated in the relatively mild amount (c. 5%) of downdip shortening. Dip-section restoration indicates a later, separate stage of deformation may have involved removal of a significant volume of material as part of the final stages of the Storegga Slide, as opposed to the minor volumes reported in previous studies.

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Integrated characterization and failure mechanism for a mid-Pleistocene mass transport complex-dominant interval in the Mars Ursa Basin, northern Gulf of Mexico, USA

Gutierrez

Snedden

2021

Interpretation

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The economic and operational risks associated with Mass Transport Complexes (MTCs) in deepwater hydrocarbon exploration act as a principal motivation to investigate their depositional elements utilizing industry data. There is a lack of extensive seismic and well data coverage that limits the understanding of the processes associated with the evolution of MTCs within deepwater sedimentary basins. This study leverages a unique integrated dataset to evaluate the depositional character and potential failure mechanisms of seven identified MTCs preserved in a synkinematic mid-Pleistocene MTC-dominant interval that spans the hydrocarbon bearing Mars Ursa Basin in the Northern Gulf of Mexico. Through seismic interpretation and attribute extraction methods using a 3D PDSM seismic survey, we describe kinematic indicators and preserved morphodomains geometries of the identified MTCs. The MTC-dominant interval covers an area of 631 km2, a volume of 392 km3, and a maximum thickness of 549 m in minibasin centers. The interval is penetrated by fifteen boreholes that provide stratigraphic and lithologic calibration of the morphometric analyses. The lithological composition of the MTC-rich interval is claystone/mudstone-dominant with a few interbedded, thin sandstones. The identified kinematic indicators and geometric extent of the identified MTCs are a function of both local salt tectonics extrabasinal controls. The stratigraphic framework presented in this study constrains the timing of failures to a period of high sediment deposition related to a major increase of glacial input into the Quaternary Mississippi Fan. This study offers borehole calibrated MTC morphometrics preserved in a MTC-dominant interval whose failure is triggered by local salt inflation, but ultimately is a consequence of loading following increased sediment supply into the basin. The results from this robust data set build upon past integrated seismic-well studies that strive to improve the understanding of MTC processes and their implications in hydrocarbon exploration across salt sedimentary basins.

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Advancing from subaqueous mass movement case studies to providing advice and mitigation

Cited by 5 publications

References 88 publications

Lessons learned from the monitoring of turbidity currents and guidance for future platform designs

Lessons learned from the monitoring of turbidity currents and guidance for future platform designs

Line length balancing to evaluate multi-phase submarine landslide development: an example from the Storegga Slide, Norway

Integrated characterization and failure mechanism for a mid-Pleistocene mass transport complex-dominant interval in the Mars Ursa Basin, northern Gulf of Mexico, USA

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