Partners

1

• Partners
• EIGSI Engineering School La Rochelle , Project
  Coordinator
• CEDRE Expertise Center, Centre de Documentation
  de Recherche et dExpérimentations sur les
  Pollutions Accidentelles des eaux, Brest
• ULR La Rochelle University, Hydrodynamic LEPTAB
• CETMEF French Administration, Centre dEtudes
  Techniques Maritimes et Fluviales, Département
  Environnement Littoral et Cours d'Eau (DELCE),
  Division environnement marin et littoral (DEML)
  Brest-Plouzané
• EDF RD LNHE Laboratoire National dHydraulique
  et Environnement Chatou

SIMBAR Oil Spill Boom and Contingency Plan
Modelling
Objectives Optimal usages of booming in practice
Acknowledgements The financial support of the
French Administration on Environment and
Sustainable Development, Ministère de lEcologie
et du Développement Durable (MEDD), is gratefully
acknowledged, grant n CV 13 2003, Accord nCV
03000142, date 15/03/2004. The project SIMBAR is
a member from 2003 of the French research network
RITMER on Accidental Maritime Pollutions and
theirs Ecological Impacts.
Key words Oil pollution, Coastal water,
Recommendations, Technological Innovations,
Environmental technologies, Oil Spill Boom
Contact Frédéric Muttin EIGSI La Rochelle
muttin_at_eigsi.fr Web site Simbar
http//simbar.eigsi.fr
2
The problem addressed on booms Boom efficiency
is limited by different physical effects of oil
leakage under the boom (entrainment,
submersion,). CEDRE gives the different physical
properties needed. Three kinds of oil were
studied light, heavy and emulsion. A standard
boom geometry is used for design improvements
diameter of the float 55 cm, skirt height 75 cm
de hauteur. An exploratory study over more than
20 parameters on the design of a boom has been
conducted elasticity of the fabric, size of the
chain, leach and mooring members.
The boom efficiency is limited by submersion or
entrainment of oil under the boom. CEDRE gives
the physical parameters of oils and booms.
The boom modeling The main objective is to
propose a complete modeling of the boom. Fluid
mechanics and solid mechanics are involved. Based
on model result, recommendations on boom design
are given. The current limit on the boom
efficiency must be more than the actual limit
0.35 0.5 m/s. The objective is to increase the
limit to 1 m/s. The concept of oil deviation by
boom is study. The mechanical stress on the boom
is concentrated on the chain on the bottom of the
skirt.
The visualisation of the flow permits to identify
the efficiency limit of the contingency by booms.
The University of La Rochelle provides boom tests
in a channel.
The numerical simulation of the flows (oil and
water) used the method SPH. The simulations in
2D have been made with a uniform current and with
a monochromatic wave. A current higher than 0.35
m/s will give oil leakage under the boom. LNHE
works on the fluid flow computation around the
boom (SPARTACUS).
The validation The mooring device of a boom used
buoyancies, mooring lines, anchors or
dead-masses. The French response team CETMEF will
use the result of the research to improve the
POLMAR plan. The boom plan of the river Elorn
(Brest bay) is used as case study. The boom
computation uses both tide and river current
pressures. The boom plan length is 1030 m. The
vertical angle of the skirt, around 10, plays a
central role in the oil contingency. The double
mooring device on both parts of the boom is
useful when the tide inverses the current
direction.
EIGSI computes the structural behaviour of boom
plan on the coastal sea zone.