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| Lurton, Xavier. |
| Multi-Beam Echo-Sounders (MBES) designed for seafloor-mapping applications are today a major tool for ocean exploration and monitoring. Concerns have been raised about their impact towards marine life and especially marine mammals, although their inherent characteristics (high frequencies, short signals and narrow transmitting lobes) actually minimize this possibility. The present paper proposes an analysis of MBES radiation characteristics (pulse design, source level and radiation directivity pattern) accounting for the various geometries met today and expressed according to the metrics used for acoustical impact assessment (maximum Sound Pressure Level, and cumulative Sound Exposure Level). A detailed radiation model is proposed, including the... |
| Tipo: Text |
Palavras-chave: Multibeam echosounders; Marine mammals; Sonar impact assessment; Sound Pressure Level; Sound Exposure Level; Directivity pattern. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00278/38957/37497.pdf |
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| Lamarche, Geoffroy; Lurton, Xavier. |
| Multibeam echosounders are becoming widespread for the purposes of seafloor bathymetry mapping, but the acquisition and the use of seafloor backscatter measurements, acquired simultaneously with the bathymetric data, are still insufficiently understood, controlled and standardized. This presents an obstacle to well-accepted, standardized analysis and application by end users. The Marine Geological and Biological Habitat Mapping group (Geohab.org) has long recognized the need for better coherence and common agreement on acquisition, processing and interpretation of seafloor backscatter data, and established the Backscatter Working Group (BSWG) in May 2013. This paper presents an overview of this initiative, the mandate, structure and program of the working... |
| Tipo: Text |
Palavras-chave: Multibeam echosounders; Calibration; Reflectivity; Mapping; Seafloor. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00385/49655/50179.pdf |
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