7 Structural Analysis of Oil-Spill Booms
153
Fig. 7.3 Elorn estuarine site for experiment
Curtain
The boom plan is composed of 210 m long curtain and four mooring devices. The
skirt height is 0.61 m (including chain) and the inflated float diameter is 0.45 m. The
linear density of the boom is 8.6 kg/m. The tension limit of the chain is 15 and 14
T for the leach at the waterline. Each mooring device uses buoyancy coffer (volume
2 m 3 ), mooring chain (diameter 0.0035 m) and dead-mass (3 T). As a consequence
of non-constant bathymetry and tide amplitude, the four mooring chain lengths are
respectively 15 m, two times 20 and 25 m. The maximal tide amplitude of the site is
6.9 m. The tide level coefficient attains 93 during the experiment period.
The following Fig. 7.4 shows the Elorn site, the boom plan with its four theoretical
mooring points, A, B, C, D and the buoy moored position BM.
The minimal water height is theoretically 4.5 m at point D. The mooring point
positions are given in the following Table 7.1.
A lighting device is attached to the coffer at point D to orient above two fixed
lights FI–R in the South East and North East of the site. It allows safe maritime traffic
during night periods in the maritime channel located at the near East of point D and
around the boom.
The maritime and terrestrial materials as well as the administrative and operational staffs necessary for the experiment implementation are not detailed here. The
launching of the boom in the Elorn estuary is illustrated by the following Fig. 7.5
with a photo taken by a resident.
153
Fig. 7.3 Elorn estuarine site for experiment
Curtain
The boom plan is composed of 210 m long curtain and four mooring devices. The
skirt height is 0.61 m (including chain) and the inflated float diameter is 0.45 m. The
linear density of the boom is 8.6 kg/m. The tension limit of the chain is 15 and 14
T for the leach at the waterline. Each mooring device uses buoyancy coffer (volume
2 m 3 ), mooring chain (diameter 0.0035 m) and dead-mass (3 T). As a consequence
of non-constant bathymetry and tide amplitude, the four mooring chain lengths are
respectively 15 m, two times 20 and 25 m. The maximal tide amplitude of the site is
6.9 m. The tide level coefficient attains 93 during the experiment period.
The following Fig. 7.4 shows the Elorn site, the boom plan with its four theoretical
mooring points, A, B, C, D and the buoy moored position BM.
The minimal water height is theoretically 4.5 m at point D. The mooring point
positions are given in the following Table 7.1.
A lighting device is attached to the coffer at point D to orient above two fixed
lights FI–R in the South East and North East of the site. It allows safe maritime traffic
during night periods in the maritime channel located at the near East of point D and
around the boom.
The maritime and terrestrial materials as well as the administrative and operational staffs necessary for the experiment implementation are not detailed here. The
launching of the boom in the Elorn estuary is illustrated by the following Fig. 7.5
with a photo taken by a resident.