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Precision of high-resolution multibeam echo sounding coupled with high-accuracy positioning in a shallow water coastal environment

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Abstract

Over 4 years, repetitive bathymetric measurements of a shipwreck in the Grådyb tidal inlet channel in the Danish Wadden Sea were carried out using a state-of-the-art high-resolution multibeam echosounder (MBES) coupled with a real-time long range kinematic (LRK™) global positioning system. Seven measurements during a single survey in 2003 (n=7) revealed a horizontal and vertical precision of the MBES system of ±20 and ±2 cm, respectively, at a 95% confidence level. By contrast, four annual surveys from 2002 to 2005 (n=4) yielded a horizontal and vertical precision (at 95% confidence level) of only ±30 and ±8 cm, respectively. This difference in precision can be explained by three main factors: (1) the dismounting of the system between the annual surveys, (2) rougher sea conditions during the survey in 2004 and (3) the limited number of annual surveys. In general, the precision achieved here did not correspond to the full potential of the MBES system, as this could certainly have been improved by an increase in coverage density (soundings/m2), achievable by reducing the survey speed of the vessel. Nevertheless, precision was higher than that reported to date for earlier offshore test surveys using comparable equipment.

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Acknowledgements

This study was supported by the German Science Foundation (DFG) as part of the DFG Research Center Ocean Margins (RCOM) at the University of Bremen, Germany and the Senckenberg Institute who provided the ship time. We are grateful to the captain and crew of the RV Senckenberg for their expertise and unfailing good spirits during the cruises. Dr. Peter J. Ramsey, Director of Marine GeoSolutions, and an anonymous reviewer are both thanked for their thorough and constructive assessments.

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Authors and Affiliations

  1. Research Center Ocean Margins, University of Bremen, P.O. Box 330440, 28359, Bremen, Germany

    Verner B. Ernstsen & Dierk Hebbeln

  2. Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge, CB2 1ER, UK

    Riko Noormets

  3. Department of Marine Science, Senckenberg Institute, Suedstrand 40, 26382, Wilhelmshaven, Germany

    Alex Bartholomä & Burg W. Flemming

Authors
  1. Verner B. Ernstsen
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  2. Riko Noormets
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  3. Dierk Hebbeln
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  4. Alex Bartholomä
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  5. Burg W. Flemming
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Correspondence to Verner B. Ernstsen.

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Ernstsen, V.B., Noormets, R., Hebbeln, D. et al. Precision of high-resolution multibeam echo sounding coupled with high-accuracy positioning in a shallow water coastal environment. Geo-Mar Lett 26, 141–149 (2006). https://doi.org/10.1007/s00367-006-0025-3

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  • DOI: https://doi.org/10.1007/s00367-006-0025-3

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