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In situ optical measurement of particles in sediment plumes generated by a pre-prototype polymetallic nodule collector
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In situ optical measurement of particles in sediment plumes generated by a pre-prototype polymetallic nodule collector
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Journal Article
In situ optical measurement of particles in sediment plumes generated by a pre-prototype polymetallic nodule collector
2024
Overview
This study presents in situ, high-resolution optical measurements of particle size distributions (PSD) within sediment plumes generated by a pre-prototype deep seabed nodule collector vehicle operating in the abyssal Pacific Ocean. These measurements were obtained using a cutting-edge instrument, the LISST-RTSSV sensor. The data collected in situ reveal marked differences compared to previously reported laboratory-based, ex situ measurements. The grain size and other key particle shape characteristics are found to be dependent on multiple factors, including the collector vehicle maneuvers, the time elapsed following sediment discharge, and the complex hydrodynamic processes that generate the sediment in suspension. Significantly, the PSD from a highly complex succession of straight-line maneuvers converges to that of the canonical case of a simple straight-line driving maneuver within a timescale of ten minutes. Our results underscore the importance of parameterizing sediment plume transport models based on well-informed, comprehensive PSDs of detrained suspended sediment measured in situ at adequate timescales and in regions no longer strongly influenced by active and complex hydrodynamic processes.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
