Evaluation of the LISST-ST instrument for suspended particle size distribution and settling velocity measurements

Francisco Pedocchi; Marcelo H. García

doi:10.1016/j.csr.2006.03.006

Evaluation of the LISST-ST instrument for suspended particle size distribution and settling velocity measurements

Research output: Contribution to journal › Article › peer-review

Abstract

The Laser In Situ Scattering Transmissometry (LISST) instruments produced by Sequoia Scientific Inc. use light scattering to measure concentration and size distributions of sediment suspensions. In this article, the capabilities of the LISST-ST instrument are studied. The instrument reports the suspended sediment concentration and the settling velocity for eight different size classes by measuring the sediment concentration at the bottom of a small settling column. The size resolution of the LISST-100 and LISST-ST instruments is studied. This study utilizes a new inversion algorithm to obtain the size distribution from the scattered light pattern. In addition, attention is directed to observed deviations in laboratory measurements that may affect the relative concentrations and the settling velocity estimations. These deviations are analyzed in terms of: sample mixing problems; deviations on the settling of a suspension from its ideal behavior; and the effect of the shape of natural particles on laser scattering compared to that of spheres. Results suggests, of these three points the difference in the light scattering by irregular particles compared to the scattering by spheres is the main source of deviation on the settling velocity estimations. Finally, practical recommendations are given in order to gain confidence in the instrument results.

Original language	English (US)
Pages (from-to)	943-958
Number of pages	16
Journal	Continental Shelf Research
Volume	26
Issue number	8
DOIs	https://doi.org/10.1016/j.csr.2006.03.006
State	Published - Jun 2006

Keywords

Grain size
Light scattering
Particle concentration
Particle settling

ASJC Scopus subject areas

Oceanography
Aquatic Science
Geology

Online availability

10.1016/j.csr.2006.03.006

Library availability

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title = "Evaluation of the LISST-ST instrument for suspended particle size distribution and settling velocity measurements",

abstract = "The Laser In Situ Scattering Transmissometry (LISST) instruments produced by Sequoia Scientific Inc. use light scattering to measure concentration and size distributions of sediment suspensions. In this article, the capabilities of the LISST-ST instrument are studied. The instrument reports the suspended sediment concentration and the settling velocity for eight different size classes by measuring the sediment concentration at the bottom of a small settling column. The size resolution of the LISST-100 and LISST-ST instruments is studied. This study utilizes a new inversion algorithm to obtain the size distribution from the scattered light pattern. In addition, attention is directed to observed deviations in laboratory measurements that may affect the relative concentrations and the settling velocity estimations. These deviations are analyzed in terms of: sample mixing problems; deviations on the settling of a suspension from its ideal behavior; and the effect of the shape of natural particles on laser scattering compared to that of spheres. Results suggests, of these three points the difference in the light scattering by irregular particles compared to the scattering by spheres is the main source of deviation on the settling velocity estimations. Finally, practical recommendations are given in order to gain confidence in the instrument results.",

keywords = "Grain size, Light scattering, Particle concentration, Particle settling",

author = "Francisco Pedocchi and Garc{\'i}a, {Marcelo H.}",

note = "Funding Information: This research was conducted under the Coastal Geosciences Program of the US Office of Naval Research as part of the EuroStrataform Project (Grants N00014-03-1-0143 and N00014-01-1-0337). F. Pedocchi was also supported by a fellowship from the Organization of American States. This support is gratefully acknowledged. The authors would like to thank Yogi Agrawal and Ole Mikkelsen for their useful suggestions during the revision of this article. Also thanks to Yovanni A. Cata{\~n}o, Juan E. Mart{\'i}n and Blake J. Landry for their help preparing this article. ",

year = "2006",

month = jun,

doi = "10.1016/j.csr.2006.03.006",

language = "English (US)",

volume = "26",

pages = "943--958",

journal = "Continental Shelf Research",

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}

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AU - Pedocchi, Francisco

AU - García, Marcelo H.

N1 - Funding Information: This research was conducted under the Coastal Geosciences Program of the US Office of Naval Research as part of the EuroStrataform Project (Grants N00014-03-1-0143 and N00014-01-1-0337). F. Pedocchi was also supported by a fellowship from the Organization of American States. This support is gratefully acknowledged. The authors would like to thank Yogi Agrawal and Ole Mikkelsen for their useful suggestions during the revision of this article. Also thanks to Yovanni A. Cataño, Juan E. Martín and Blake J. Landry for their help preparing this article.

PY - 2006/6

Y1 - 2006/6

N2 - The Laser In Situ Scattering Transmissometry (LISST) instruments produced by Sequoia Scientific Inc. use light scattering to measure concentration and size distributions of sediment suspensions. In this article, the capabilities of the LISST-ST instrument are studied. The instrument reports the suspended sediment concentration and the settling velocity for eight different size classes by measuring the sediment concentration at the bottom of a small settling column. The size resolution of the LISST-100 and LISST-ST instruments is studied. This study utilizes a new inversion algorithm to obtain the size distribution from the scattered light pattern. In addition, attention is directed to observed deviations in laboratory measurements that may affect the relative concentrations and the settling velocity estimations. These deviations are analyzed in terms of: sample mixing problems; deviations on the settling of a suspension from its ideal behavior; and the effect of the shape of natural particles on laser scattering compared to that of spheres. Results suggests, of these three points the difference in the light scattering by irregular particles compared to the scattering by spheres is the main source of deviation on the settling velocity estimations. Finally, practical recommendations are given in order to gain confidence in the instrument results.

AB - The Laser In Situ Scattering Transmissometry (LISST) instruments produced by Sequoia Scientific Inc. use light scattering to measure concentration and size distributions of sediment suspensions. In this article, the capabilities of the LISST-ST instrument are studied. The instrument reports the suspended sediment concentration and the settling velocity for eight different size classes by measuring the sediment concentration at the bottom of a small settling column. The size resolution of the LISST-100 and LISST-ST instruments is studied. This study utilizes a new inversion algorithm to obtain the size distribution from the scattered light pattern. In addition, attention is directed to observed deviations in laboratory measurements that may affect the relative concentrations and the settling velocity estimations. These deviations are analyzed in terms of: sample mixing problems; deviations on the settling of a suspension from its ideal behavior; and the effect of the shape of natural particles on laser scattering compared to that of spheres. Results suggests, of these three points the difference in the light scattering by irregular particles compared to the scattering by spheres is the main source of deviation on the settling velocity estimations. Finally, practical recommendations are given in order to gain confidence in the instrument results.

KW - Grain size

KW - Light scattering

KW - Particle concentration

KW - Particle settling

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Evaluation of the LISST-ST instrument for suspended particle size distribution and settling velocity measurements

Abstract

Keywords

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