Data/hora: 06/06/2024 02:17:38

Provedor de dados: | 5
País: | France
Título: | Backscatter calibration of high-frequency multibeam echosounder using a reference single-beam system, on natural seafloor
Autores: | Eleftherakis, Dimitrios; Berger, Laurent; Le Bouffant, Naig; Pacault, Anne; Augustin, Jean-marie; Lurton, Xavier.
Data: | 2018-06
Ano: | 2018
Palavras-chave: | Calibration; Seafloor backscatter; Multibeam echosounder; Single-beam echosounder.
Resumo: | The calibration of multibeam echosounders for backscatter measurements can be conducted efficiently and accurately using data from surveys over a reference natural area, implying appropriate measurements of the local absolute values of backscatter. Such a shallow area (20-m mean depth) has been defined and qualified in the Bay of Brest (France), and chosen as a reference area for multibeam systems operating at 200 and 300 kHz. The absolute reflectivity over the area was measured using a calibrated single-beam fishery echosounder (Simrad EK60) tilted at incidence angles varying between 0° and 60° with a step of 3°. This reference backscatter level is then compared to the average backscatter values obtained by a multibeam echosounder (here a Kongsberg EM 2040-D) at a close frequency and measured as a function of angle; the difference gives the angular bias applicable to the multibeam system for recorded level calibration. The method is validated by checking the single- and multibeam data obtained on other areas with sediment types different from the reference area.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00429/54016/57434.pdf

DOI:10.1007/s11001-018-9348-5

https://archimer.ifremer.fr/doc/00429/54016/

Editor: | Springer
Formato: | application/pdf
Fonte: | Marine Geophysical Research (0025-3235) (Springer), 2018-06 , Vol. 39 , N. 1-2 , P. 55-73

Fonte:

Springer Science+Business Media B.V., part of Springer Nature 2018

info:eu-repo/semantics/openAccess

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