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Osculatory surfaces applied to systematic errors estimation in repeated MBES surveys
Debese, N.; Jacq, J.J.; Degrendele, K.; Roche, M. (2019). Osculatory surfaces applied to systematic errors estimation in repeated MBES surveys, in: Lefebvre, A. et al. International conference MARID VI - Marine and River Dune Dynamics 2019, 1 - 3 April 2019, Bremen, Germany: book of abstracts. pp. 69-76
In: Lefebvre, A.; Garlan, T.; Winter, C. (Ed.) (2019). International conference MARID VI - Marine and River Dune Dynamics 2019, 1 - 3 April 2019, Bremen, Germany: book of abstracts. MARUM – Center for Marine Environmental Sciences, University of Bremen/SHOM: Bremen. ISBN 978-2-11-139488-9. 267 pp., more

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Document type: Conference paper

Keyword
    Marine/Coastal

Authors  Top 
  • Debese, N.
  • Jacq, J.J.
  • Degrendele, K., more
  • Roche, M., more

Abstract
    In the Belgium part of the North Sea, regular multibeam echosounder (MBES) surveys are carried out on reference areas to control the environmental impact of the sand extraction. The volume of sand extracted can be estimated from Electronic Monitoring System (EMS) installed aboard the dredging vessels. The correction of potential systematic errors affecting the MBES bathymetric measurements is a prerequisite for precisely analyzing the correlation between EMS and MBES volume. This paper presents a new approach, based on osculatory surfaces, to estimate and correct the bathymetric data from these potential biases. Osculatory surfaces are smooth virtual surfaces giving access to the envelop surface of the sandbank. Systematic errors are estimated by taken into account the morphological impact of the suction hopper dredgers and assuming a bathy-morphology stability of the sandbank on a decadal scale. Once applied to MBES bathymetric data, the volumes of sand extracted estimated from EMS data are in very high accordance with those deduced from MBES survey.

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