22 st / February 2016 www.sea-technology.com
surface. First, the profling foat quickly descends
through the water column using its ballast system,
and anchors on the seabed with its claws, which
limits its drift while parked on the seafoor until
the next profling time. Then, it starts its ascent,
taking the scientifc measurements at intervals
specifcally programmed for each
sensor. When it reaches the sur-
face, the Arvor-Cm is located via
its GPS, and the data are transmit-
ted through the Iridium satellite
system, which allows users to re-
motely control the mission.
Mechanical Design. The posi-
tion of additional sensors on a
moving platform such as a pro-
fling foat is a major issue with
regard to the quality of the mea-
surements taken, because the
optical sensors record the param-
eters from the seawater that fows
in front of them. Moreover, after
a period of time on the seafoor,
settled sediments can obstruct the
sensors. Therefore, manufactur-
ers' recommendations regarding
the position of the sensor on the platform must be strictly
followed.
A study of the sensors of interest for coastal applications
identifed two main categories of sensors to be included on
the Arvor-Cm. One category of sensors must be integrated
in a vertical position, such as the Aanderaa 3830 dissolved
oxygen optode or the Seapoint turbidity sensor. The other
category of sensors must be integrated horizontally, such
seas. To include other parameters, such as dissolved oxy-
gen, chlorophyll and turbidity, a new platform based on the
Arvor-C was developed: the Arvor-Cm multisensor coastal
profling foat.
Design of the Arvor-Cm
Operation. The Arvor-Cm operates in similar fashion to
the Arvor-C, recording a profle from the seafoor to the sea
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(Top) Arvor-Cm hardware architecture. (Bottom)
Example of profles for fve different parameters ac-
quired using the Arvor-Cm foat during the ASPEX
campaign October 2015.