HWU I3S IST TMS MUMM Nice, 17-18 December 2001 Underwater Robotics for Ocean Modelling and Monitoring Added value brought by AUV’s in the surveillance.

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Presentation transcript:

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Added value brought by AUV’s in the surveillance of exploited marine sand banks G.Pichot, A.Norro, J.Ozer MUMM

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Sources of error

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring International Hydrographic Norms In coastal areas for 20 meters depth - horizontal accuracy : 6 meters - depth accuracy : meters

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring The tidal reduction problem H = H mes. - H T.

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Transects over the Kwintebank (provided by MUMM) rG19 - rH01 meters centimeters

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring The I3S approach -Shape of the bank is stable -Profiles are re-aligned wrt first profile -A constant offset (vertical) and a constant horizontal shift are determined -Criteria : minimisation of the distance wrt first profile

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Alignment correction : histogram of the observed vertical offset Compatible with the systematic part of the error budget

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Deviation wrt the mean profile (rG19) Error max  100 cm compatible with the random part of the error budget (cm)

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring rG21 error max  250 cm rH01 error max  150 cm MUMM’s random error budget explains only 100 cm Deviation wrt the mean profile (rG21 and rH01) (cm) (cm)

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Volume consideration Should a part of the volume variation be extracted from a trend in the alignement ?

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Do we need a tidal reduction ?

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Offset with non tidally reduced data

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Conclusion With non tidally reduced data Win one third of the systematic error  Increased offset making the trend identification more difficult  Interest to compare or to combine the two approaches

HWU I3S IST TMS MUMM Nice, December 2001 Underwater Robotics for Ocean Modelling and Monitoring Need more data Conclusion(2)