Marine Geophysical Research

, Volume 39, Issue 1–2, pp 151–168 | Cite as

A framework to quantify uncertainties of seafloor backscatter from swath mapping echosounders

Original Research Paper

Abstract

Multibeam echosounders (MBES) have become a widely used acoustic remote sensing tool to map and study the seafloor, providing co-located bathymetry and seafloor backscatter. Although the uncertainty associated with MBES-derived bathymetric data has been studied extensively, the question of backscatter uncertainty has been addressed only minimally and hinders the quantitative use of MBES seafloor backscatter. This paper explores approaches to identifying uncertainty sources associated with MBES-derived backscatter measurements. The major sources of uncertainty are catalogued and the magnitudes of their relative contributions to the backscatter uncertainty budget are evaluated. These major uncertainty sources include seafloor insonified area (1–3 dB), absorption coefficient (up to > 6 dB), random fluctuations in echo level (5.5 dB for a Rayleigh distribution), and sonar calibration (device dependent). The magnitudes of these uncertainty sources vary based on how these effects are compensated for during data acquisition and processing. Various cases (no compensation, partial compensation and full compensation) for seafloor insonified area, transmission losses and random fluctuations were modeled to estimate their uncertainties in different scenarios. Uncertainty related to the seafloor insonified area can be reduced significantly by accounting for seafloor slope during backscatter processing while transmission losses can be constrained by collecting full water column absorption coefficient profiles (temperature and salinity profiles). To reduce random fluctuations to below 1 dB, at least 20 samples are recommended to be used while computing mean values. The estimation of uncertainty in backscatter measurements is constrained by the fact that not all instrumental components are characterized and documented sufficiently for commercially available MBES. Further involvement from manufacturers in providing this essential information is critically required.

Keywords

Multibeam echosounder Calibration Incidence angle 

Notes

Acknowledgements

Authors wish to thank two anonymous reviewers whose comments improved the manuscript significantly. The study was partly supported by NOAA awards NA17OG2285, NA16RP1718, NA04OAR4600155, NAOS4001153, ONR award N00014-00-1-0092 and IFREMER Foreign Fellow scientist Grant.

Disclaimer

The scientific results and conclusions, as well as any views or opinions expressed herein, are those of the author(s) and do not necessarily reflect the views of NOAA or the Department of Commerce. Mention of a commercial company or product does not constitute an endorsement by NOAA.

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2018

Authors and Affiliations

  1. 1.NOAA Office of Ocean Exploration and ResearchSilver SpringUSA
  2. 2.Underwater Acoustics Laboratory IMN/NSE/ASTI, Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER)PlouzanéFrance
  3. 3.Center for Coastal and Ocean Mapping/Joint Hydrographic CenterUniversity of New HampshireDurhamUSA

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