Présentation du projet SIMBAR sur la modélisation des barrages anti-hydrocarbure

Oil Spill Boom Modelling, a Survey of the French Research Project SIMBAR

Ecole d’Ingénieurs en Génie des Systèmes Industriels, EIGSI, La Rochelle 26 rue de Vaux-de-Foletier, F-17041 La Rochelle, France

Auteur de correspondance : muttin@eigsi.fr

Abstract

EIGSI, CEDRE, La Rochelle University, CETMEF and LNHE are partners of the project Simbar. An oil spill boom model is constructed with a global point of view. Structural computation and fluid mechanics are used together. New boom conception and design can be evaluated by using the model. Sea current velocity is the main problem for boom efficiency. The actual limit is 0.35 to 0.5 m/s. We propose the study of 3 kinds of oil (light, heavy, and emulsification). A reference for the boom geometry is chosen. It is based on a standard product (buoyancy diameter 55 cm, skirt height 75 cm). Design, material, and anchorage systems are the main investigations done. The physical limit of a boom comes from different effects: droplet carrying, overflow, and submersion. The visualisation of the flow around a 2D boom section is achieved with an experimental channel. The Froude number is used to construct a mock-up at scale 1/15. The “Smoothed Particles Hydrodynamics” SPH numerical method is used to compute the water/oil flow. A monochromatic wave simulates the sea motion on the shore. A membrane finite-element model computes the mechanical stress. The concentration of the mechanical stress is located on the chain in the bottom of the skirt. The computation of the oil boom of the river Elorn (Brest Bay) is achieved at the different stages of a tide. The boom is 1030 m long. Tide and river flows are superposed (TELEMAC 2D computation). The boom leakage comes mainly from the vertical skirt angulation.