Size sorting of fine-grained sediments during erosion: Results from the western Gulf of Lions

Law, Brent; Hill, Paul S.; Milligan, Timothy G.; Curran, K. J.; Wiberg, Patricia L.; Wheatcroft, Robert A.

doi:10.1016/j.csr.2007.11.006

Cited by 83 publications

(87 citation statements)

References 27 publications

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“…This stress corresponds to a flow velocity of ~9.5 cm s −1 . The numbers re ported in this study and that of Cromey et al (2002a,b) are similar to other published values for floc erosion (Amos et al 1997, Thomsen & Gust 2000, Law et al 2008). More consolidated cohesive sea beds have higher τ crit values, ranging from 0.03 to 0.08 Pa (Sanford & Maa 2001, Stevens et al 2007, Dickhudt et al 2010, Wiberg et al 2013.…”

Section: Discussionsupporting

confidence: 92%

“…In natural bottom sediments, the erosion of the seabed increases with increasing shear stress (Amos et al 1988, 1992, Maa et al 1998). The lack of erosion at higher shear stresses in this study occurred because of the fixed amount of waste available for erosion (Wiberg et al 1994, Law et al 2008our Fig. 4).…”

Section: Substrate Typementioning

confidence: 72%

“…Recent work on size sorting during the erosion of cores from the Gulf of Lions, France (Law et al 2008) and in Seal Harbour, Nova Scotia, Canada suggests that increases in clay (sediment particles < 4 µm in diameter) changes resuspension dynamics. In sediments that contain > 7.5% clay, a wide range of sizes are eroded at reduced but equal rates.…”

Section: Discussionmentioning

confidence: 99%

“…In the broadest terms, non-cohesive sediments have mean grain sizes > 63 µm, and cohesive sediments or 'muds' are dominated by fine-grained particles that are < 63 µm. More recently, attention has also been given to erosion of sand-mud mixtures that show complex behaviours strongly influenced by the fraction of mud in the mixture (van Ledden et al 2004, Law et al 2008, Wiberg et al 2013. Little research has focused on the erosion of aquaculture waste solids.…”

Section: Introductionmentioning

confidence: 99%

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Erodibility of aquaculture waste from different bottom substrates

Law¹,

Hill²,

Milligan³

et al. 2016

Aquacult. Environ. Interact.

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A laboratory study was carried out to examine the effect of bed sediment texture on the erodibility of salmon aquaculture waste fecal material and salmon feed pellets. Erodibility measurements of this material were made using a Gust microcosm erosion chamber and artificially composed substrates of mud, sand, sand and gravel, sand and cobble, and cobble. Results show that cumulative mass eroded (CME) and erodibility constant (M) can vary by up to an order of magnitude depending on substrate composition, with a mud substrate having higher CME and M values than those of substrates composed of sand, gravel and cobble. Findings from this study suggest that bottom sediment texture plays a major role in aquaculture waste resuspension and subsequent transport and that predictive models of the transport of aquaculture waste should include the erosion dynamics of bottom texture.

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Section: Discussionsupporting

confidence: 92%

Section: Substrate Typementioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Erodibility of aquaculture waste from different bottom substrates

Law¹,

Hill²,

Milligan³

et al. 2016

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

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“…TE250, is 250 m east of the platform) (Table 1). Sampling consisted of deployment of a Bothner-type Slo-Corer (Law et al, 2008). The Slo-Corer applied a large driving force ($350 kg) onto a polycarbonate core barrel while hydraulically damping the rate of descent.…”

Section: Sediment Sample Collection and Analysismentioning

confidence: 99%

Analysis of bacterial diversity and metals in produced water, seawater and sediments from an offshore oil and gas production platform

Yeung

Law

Milligan

et al. 2011

Marine Pollution Bulletin

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Produced water is one of the largest waste products routinely discharged into the ocean from offshore oil and gas platforms. This study analyzed bacterial communities and metals in the produced water, surrounding seawater, and sediment around the Thebaud platform. The bacterial community within the produced water was different from the seawater (SAB = 13.3), but the discharge had no detectable effect on the bacterial communities in the seawater (SAB > 97). In contrast, genomic analysis of sediments revealed that the bacterial community from 250 m was different (SAB = 70) from other locations further from the discharge, suggesting that the produced water had a detectable effect on the bacterial community in the sediment closest to the discharge. These near-field sediments contained elevated concentrations of manganese and iron that are associated with the produced water effluent. The results suggested that the discharge of produced water has influenced the bacterial community structure of sediments adjacent to the platform.Crown

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Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1

et al. 2013

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[1] Sea surface temperatures (SST) and inorganic continental input over the last 25,000 years (25 ka) are reconstructed in the far eastern equatorial Pacific (EEP) based on three cores stretching from the equatorial front (~0.01°N, ME0005-24JC) into the cold tongue region (~3.6°S; TR163-31P and V19-30). We revisit previously published alkenone-derived SST records for these sites and present a revised chronology for V19-30. Inorganic continental input is quantified at all three sites based on 230 Th-normalized fluxes of the long-lived continental isotope thorium-232 and interpreted to be largely dust. Our data show a very weak meridional (cross-equatorial) SST gradient during Heinrich Stadial 1 (HS1, 18-15 ka B.P.) and high dust input along with peak export production at and north of the equator. These findings are corroborated by an Earth system model experiment for HS1 that simulates intensified northeasterly trade winds in the EEP, stronger equatorial upwelling, and surface cooling. Furthermore, the related southward shift of the Intertropical Convergence Zone (ITCZ) during HS1 is also indicative of drier conditions in the typical source regions for dust.

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Size sorting of fine-grained sediments during erosion: Results from the western Gulf of Lions

Cited by 83 publications

References 27 publications

Erodibility of aquaculture waste from different bottom substrates

Erodibility of aquaculture waste from different bottom substrates

Analysis of bacterial diversity and metals in produced water, seawater and sediments from an offshore oil and gas production platform

Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1

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