Diapositive 1 - Présentation de SIMBAR - Eigsi

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Oct 24, 2013 (3 years and 9 months ago)

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SIMBAR


Oil Spill Boom and Contingency Plan
Modelling


Objectives

Optimal usages of
booming in practice


Partners


EIGSI

Engineering School La Rochelle , Project Coordinator


CEDRE

Expertise Center, Centre de Documentation de
Recherche et d’Expérimentations sur les Pollutions
Accidentelles des eaux, Brest


ULR

La Rochelle University, Hydrodynamic LEPTAB


CETMEF

French Administration, Centre d’Etudes Techniques
Maritimes et Fluviales, Département Environnement Littoral et
Cours d'Eau (DELCE), Division environnement marin et
littoral (DEML) Brest
-
Plouzané


EDF

R&D

LNHE

Laboratoire National d’Hydraulique et
Environnement Chatou


Contact

Frédéric Muttin EIGSI La Rochelle

muttin@eigsi.fr

Web site Simbar : http://simbar.eigsi.fr

Acknowledgements

The financial support of the French Administration on
Environment and Sustainable Development, Ministère de
l’Ecologie et du Développement Durable (MEDD), is gratefully
acknowledged, grant n
°

CV 13 2003, Accord n
°
CV 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


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 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 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.


The

numerical

simulation

of

the

flows

(oil

and

water)

used

the

method

SPH
.


The

simulations

in

2
D

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

boom

efficiency

is

limited

by

submersion

or

entrainment

of

oil

under

the

boom
.

CEDRE

gives

the

physical

parameters

of

oils

and

booms
.

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
.

EIGSI

computes

the

structural

behaviour

of

boom

plan

on

the

coastal

sea

zone
.