Environmental Engineering Reference
In-Depth Information
Fig. 7.4 Site of Elorn plan with mooring points and buoy positions
Table 7.1 Mooring point
positions ordered from West
to East
A
B
C
D
4 22
286 W 4 22
235 W 4 22
183 W 4 22
130 W
,
,
,
,
48 23
964 N 48 23
965 N 48 23
968 N 48 23
968 N
,
,
,
,
Instruments
The scientific material is composed of different sensors installed on three supports,
the moored buoy, a small ship and the boom itself.
First, the sensors installed on the buoy are described. All of these sensors are
connected to a data logger using the same registration period of 15 s.
Acoustic directional current meter giving the current velocity vector at the buoy
bottom.
Directional anemometer giving the wind vector at the buoy head.
Water column height under the buoy.
Buoy position by using GPS.
Buoy battery charge indicator by using the current voltage.
The buoy must be anchoraged at higher than 50mwith the boom to avoid a collision.
The La Rochelle preliminary experiment has permitted to improve the battery capac-
ity, to define a common sampling time step for the different sensors and to upgrade
the reliability of the VHF transmission from the dynamometer.
Secondly, the sensors linked to the boom are described. At the buoyancy coffer
connected to the boom at point D a dynamometer is installed on the mooring line
 
Search WWH ::




Custom Search