Geohazards and Ocean Hazards in Deepwater: Overview and Methods of Assessment

Stow, Dorrik; Brackenridge, Rachel; Patel, Urval; Toulmin, S.

doi:10.4043/23697-ms

Cited by 8 publications

(3 citation statements)

References 68 publications

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“…This is confirmed with the observed coarsest grained sediments accumulating in areas of amplified bottom current velocities (for example, BC05 and U1388 located within the contourite channels) and the finest grained sediments being collected from sites more distal from the MOW flow (for example, PC08). There is not, however, a direct linear correspondence for a number of reasons (McCave, ; Stow et al ., , ; Mulder et al ., ):…”

Section: Discussionmentioning

confidence: 98%

Textural characteristics and facies of sand‐rich contourite depositional systems

et al. 2018

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This work presents a detailed study of CONTOURIBER and Integrated Ocean Drilling Program 339 sediment data targeting sand-rich contourites in the Eastern Gulf of Cadiz. All of the collected sediments are interpreted as contourites (deposited or reworked by bottom currents) on the basis of oceanographic setting, seismic and morphometric features, and facies characteristics. A variety of sandy and associated facies are found across the study area including: (i) bioturbated muddy contourites; (ii) mottled silty contourites; (iii) very fine mottled and fine-grained bioturbated sandy contourites; (iv) massive and laminated sandy contourites; and (v) coarse sandy/ gravel contourites. The thickest sands occur within contourite channels and there is a marked reduction in sand content laterally away from channels. Complementary to the facies descriptions, grain-size analysis of 675 samples reveals distinctive trends in textural properties linked to depositional processes under the action of bottom currents. The finest muddy contourites (<20 lm) show normal grain-size distributions, poor to very poor sorting, and zero or low skewness. These are deposited by settling from weak bottom currents with a fine suspension load. Muddy to fine sandy contourites (20 to 200 lm) trend towards better sorting and initially finer and then coarser skew. These are typical depositional trends for contourites. As current velocity and carrying capacity increase, more of the finest fraction remains in suspension and bedload transport becomes more important. Clean sandy contourites (>200 lm) are better sorted. They result from the action of dominant bedload transport and winnowing at high current speeds. The results highlight the importance of bottom current velocity, sediment supply and bioturbational mixing in controlling contourite facies. Despite growing interest in their hydrocarbon exploration potential, contourite sands have remained poorly understood. This research therefore has important implications for developing current understanding of these deposits and aiding the correct interpretation of deep marine sands and depositional processes. 2223

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Section: Discussionmentioning

confidence: 98%

Textural characteristics and facies of sand‐rich contourite depositional systems

et al. 2018

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“…Previous authors have highlighted that contourite deposition is often associated to slope instability along continental margins (Laberg and Camerlenghi 2008;Stow et al 2012;Nicholson et al under revision). Along the Northwest European margin, the giant (~3,500 km 3 ) Storegga Slide is, in part, a result of the reduced shear strength within the basal failure plane comprising clay-rich contourites (Bryn et al 2005).…”

Section: Deltaic Deposition and Sediment Loadingmentioning

confidence: 99%

“…Secondly, the fine muddy nature of contourite sediments makes then likely to have low internal shear strength (Laberg and Camerlenghi 2008). Finally, their convex-upwards external morphology can result in locally high gradients on the continental slope making failure more likely Stow et al (2012). Laberg and Camerlenghi (2008) note that there is often an association between gas hydrate accumulation and contourite deposition due to the elevated pore space in these rapidly deposited accumulations and may be an additional factor making contourites sediments susceptible to failure.…”

Section: Deltaic Deposition and Sediment Loadingmentioning

confidence: 99%

Indonesian Throughflow as a preconditioning mechanism for submarine landslides in the Makassar Strait

Brackenridge

Nicholson

Sapiie

et al. 2020

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The manuscript will undergo copyediting, typesetting and correction before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the book series pertain. Although reasonable efforts have been made to obtain all necessary permissions from third parties to include their copyrighted content within this article, their full citation and copyright line may not be present in this Accepted Manuscript version. Before using any content from this article, please refer to the Version of Record once published for full citation and copyright details, as permissions may be required.

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Effect of shearing actions on the rheological properties and mesostructures of CMC, PVP and CMC+PVP aqueous solutions as simple water-based drilling fluids for gas hydrate drilling

Zhang

Sun

Han

et al. 2016

Journal of Unconventional Oil and Gas Resources

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Geohazards and Ocean Hazards in Deepwater: Overview and Methods of Assessment

Abstract: Drilling for hyd Amongst thes permanent bo slumps, debris hese deepwa hydrate distrib deepwater op knowledge of and understan cables, subse susceptible to operations inc pipelines. It w considerations ntroduction Deepwater is oceanographe m water depth ndustry, deep his paper, we water.

Cited by 8 publications

References 68 publications

Textural characteristics and facies of sand‐rich contourite depositional systems

Textural characteristics and facies of sand‐rich contourite depositional systems

Indonesian Throughflow as a preconditioning mechanism for submarine landslides in the Makassar Strait

Effect of shearing actions on the rheological properties and mesostructures of CMC, PVP and CMC+PVP aqueous solutions as simple water-based drilling fluids for gas hydrate drilling

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