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Devices to measure settling velocities of cohesive sediment aggregates: a review of the in situ technology Mantovanelli, A.; Ridd, P.V. (2006). Devices to measure settling velocities of cohesive sediment aggregates: a review of the in situ technology. J. Sea Res. 56(3): 199-226. https://dx.doi.org/10.1016/j.seares.2006.05.002 In: Journal of Sea Research. Elsevier/Netherlands Institute for Sea Research: Amsterdam; Den Burg. ISSN 1385-1101; e-ISSN 1873-1414, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 352991 [ aanvragen ]

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Trefwoorden

In situ measurements Literature reviews Motion > Particle motion > Particle settling Resources > Natural resources > Mineral resources > Mineral deposits > Seabed deposits > Aggregates Sediments > Cohesive sediments Velocity > Settling rate Marien/Kust

Author keywords

settling velocity; in situ devices; measurements in the field; review

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Auteurs		Top
Mantovanelli, A. Ridd, P.V.

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Abstract

Suspended cohesive sediments in coastal water bodies occur mainly as amorphous aggregates of single particles and microflocs. The fragile nature of these aggregates demands that their settling velocities be measured under field conditions to minimise their disruption. This review presents the main devices available to measure settling velocities of cohesive sediments in situ. These include hand-operated settling tubes and automated settling columns equipped with video systems, optical and laser instruments and an underwater balance. Additionally, non-intrusive techniques can be used, such as holographic and acoustic backscatter sensors. Regarding their operational principle, these in situ devices can apply direct or indirect methods for computing the settling velocity distribution in terms of particle size, mass or concentration. These devices are briefly described emphasising some important logistical and scientific issues that arise when these instruments are used in the field, in order to facilitate the selection of an appropriate technique for a particular research application. Due to the complexity involved in the in situ settling velocity measurements, a simultaneous application of different types of instruments seems to be the more appropriate approach to understand the aggregate dynamics.

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