Data/hora: 07/06/2024 09:21:11

Provedor de dados: | 5
País: | France
Título: | Suspended sediments in a macrotidal estuary: comparison and use of different sensors
Autores: | Lunven, Michel; Gentien, Patrick.
Data: | 2000-05
Ano: | 2000
Palavras-chave: | Particle size; Suspended particulate matter; Aggregates; Taille de particule; Matières en suspension; Agrégats.
Resumo: | Measurements made using an in situ particle-sizer (PSA) were compared to those of an optical backscatter sensor (OBS) in a macrotidal estuary. Both estimate the total volume of particles. After comparison with dry weight of suspended matter sampled in the study area, the different measurements were converted into dry weight. In three different kinetic energy regimes, times series were coherent for most of the observations. Discrepancies of suspended sediment concentrations estimated by both sensors appeared under specific hydrodynamic conditions: they were related to occurrences of definite particle populations. Overestimations and underestimations of measurements by the instruments depend on the optical principles of the sensors (backscatter and diffraction). Flocs appearing at low tide with low currents are detected by the PSA and not detected by the OBS which is more sensitive to finer particles and re-suspension of sedimentary particles from the bed, induced by high current velocities during flood tide.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2000/publication-521.pdf

DOI:10.1016/S0399-1784(00)00126-2

http://archimer.ifremer.fr/doc/00000/521/

Editor: | Elsevier
Formato: | application/pdf
Fonte: | Oceanologica Acta (0399-1784) (Elsevier), 2000-05 , Vol. 23 , N. 3 , P. 245-260

Fonte:

2000 Ifremer/CNRS/IRD/Éditions scientifiques et médicales Elsevier SAS. All rights reserved.

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