Physical and hydrodynamic properties of deep sea mining-generated, abyssal sediment plumes in the Clarion Clipperton Fracture Zone (eastern-central Pacific)

Bibliographic Data

ID21242040
AuthorsBenjamin Gillard (0000-0002-8783-1637, University of Bremen), Kaveh Purkiani (0000-0001-6648-7091, University of Bremen), Damianos Chatzievangelou (0000-0001-7512-5105, 2Jacobs University, Bremen, DE), Annemiek Vink (3BGR, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, DE), Αnnemiek Vink (0000-0002-5178-9721, Federal Institute for Geosciences and Natural Resources), Morten Hvitfeldt Iversen (0000-0002-5287-1110), Laurenz Thomsen (0000-0003-1813-4149, 2Jacobs University, Bremen, DE)
EditorsJody W Deming (Department of Biological Oceanography, University of Washington a US), Stephen F Ackley (0000-0003-4399-9232, Department of Geological Sciences, University of Texas at San Antonio b US)
Year2019
Volume7
Publication date2019-01-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueElementa Science of the Anthropocene (JOURNAL)
Journal identifiersISSN: 2325-1026 • E-ISSN: 2325-1026
PublisherUniversity of California Press (PUBLISHER • US)
DOI10.1525/elementa.343
OpenAlexW2910855398
LanguageEN
Citations received6
References cited56

The anthropogenic impact of polymetallic nodule harvesting in the Clarion-Clipperton Fracture Zone is expected to strongly affect the benthic ecosystem. To predict the long-term, industrial-scale impact of nodule mining on the deep-sea environment and to improve the reliability of the sediment plume model, information about the specific characteristics of deep-sea particles is needed. Discharge simulations of mining-related fine-grained (median diameter ≈ 20 μm) sediment plumes at concentrations of 35–500 mg L–1 (dry weight) showed a propensity for rapid flocculation within 10 to 135 min, resulting in the formation of large aggregates up to 1100 μm in diameter. The results indicated that the discharge of elevated plume concentrations (500 mg L–1) under an increased shear rate (G ≥ 2.4 s–1) would result in improved efficiency of sediment flocculation. Furthermore, particle transport model results suggested that even under typical deep-sea flow conditions (G ≈ 0.1 s–1), rapid deposition of particles could be expected, which would restrict heavy sediment blanketing (several centimeters) to a smaller fall-out area near the source, unless subsequent flow events resuspended the sediments. Planning for in situ tests of these model projections is underway

Benthic zone · Deep sea · Fracture zone · Geomorphology · Plume · Seabed · Sediment · Coastal and Marine Dynamics · Environmental Science · Geological formations and processes · Methane Hydrates and Related Phenomena · Geology · Oceanography

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