Multispectral and multiangle measurements of acoustic seabed backscatter acquired with a tilted calibrated echosounder

Type Article
Date 2021-06
Language English
Author(s) Fezzani Ridha1, Berger LaurentORCID1, Le Bouffant Naig1, Fonseca Luciano2, Lurton Xavier1
Affiliation(s) 1 : Inst Francais Rech Exploitat Mer, Underwater Acoust Lab, CS 10070, F-29280 Plouzane, France.
2 : Univ Brasilia Gama, Dept Elect Engn, Brasilia, DF, Brazil.
Source Journal Of The Acoustical Society Of America (0001-4966) (Acoustical Soc Amer Amer Inst Physics), 2021-06 , Vol. 149 , N. 6 , P. 4503-4515
DOI 10.1121/10.0005428
WOS© Times Cited 1
Abstract A multispectral and multiangle analysis of seabed backscatter intensity has been conducted using data from a calibrated single-beam echosounder (SBES) with five frequency channels deployed over four homogeneous areas with different sediment types in the Bay of Brest (France). The SBES transducers were tilted at incidence angles from 0 degrees to 70 degrees to record the seafloor backscatter angular response at discrete frequencies ranging from 35 to 450 kHz. The recorded backscatter levels were analyzed for their angular dependence (average backscatter strength versus frequency and angle) as well as for their sample statistical distribution. The angle and frequency dependence of the seafloor backscatter obtained using a calibrated SBES can potentially be used to calibrate multibeam systems, and it can also help in elucidating the physical processes of backscatter controlled by the interaction between the acoustic wave characteristics and the sediment properties. Backscatter measurements for each area showed a consistent frequency dependence with little variation between the four sediment types.
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Fezzani Ridha, Berger Laurent, Le Bouffant Naig, Fonseca Luciano, Lurton Xavier (2021). Multispectral and multiangle measurements of acoustic seabed backscatter acquired with a tilted calibrated echosounder. Journal Of The Acoustical Society Of America, 149(6), 4503-4515. Publisher's official version : https://doi.org/10.1121/10.0005428 , Open Access version : https://archimer.ifremer.fr/doc/00704/81634/