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Reflection from the bottom, echo classification and characterisation of acoustical propagation

Objective



The final goal of the REBECCA project is to design new
remotely operated devices for the characterisation of bottom structure that could be used either by off-shore engineers or by geologists as well as acousticians. The project objectives will be achieved through several steps:

- the study of the physical phenomena involved in the
acoustical propagation in sediments (reflection,
refraction, and interference waves) through both
theoretical and numerical approaches as well as tank
experiments;

- sea trials with both existing equipment and equipment
specially designed;

- the processing of sea data in order to validate the
models and to extract relevant information from the
echoes; and

- the design of future remote sensing devices for sediment layer identification.

In order to establish a correlation between the mechanical
characteristics of bottom sediments (obtained by geotechnics and geophysics) and of their acoustical properties (remote
sensing using acoustical means), three different approaches
will be used on the same experimental site:

- geotechnical parameter estimation (from laboratory tests on cored samples or in situ measurements using a
geotechnical module);

- geophysical parameter estimation (from reflection or
refraction of seismic surveys); and

- acoustical parameter estimation (from remote sensing
using acoustical means: steerable parametric array).

The project applications range from geology to off-shore
engineering and to propagation modelling: sediment deposition and erosion, long-range propagation modelling, shallow
investigations of sediments for pipe and cable routes,
detection of obstacles embedded in the sediments, etc.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Institut de Chimie et de Physique Industrielles de Lyon
Address
31 Place Bellecour
69288 Lyon
France

Participants (6)

CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
France
Address
Chemin Joseph Aiguier 31
13402 Marseille
Danmarks Tekniske Universitet
Denmark
Address
100,Lundtoftevej
2800 Lyngby
FOUNDATION OF RESEARCH AND TECHNOLOGY - HELLAS
Greece
Address
Vassilika Vouton
71110 Iraklion
Géodia
France
Address
205 Avenue Georges Clemeceau
92000 Nanterre
IFREMER - INSTITUT FRANÇAIS DE RECHERCHE POUR L'EXPLOITATION DE LA MER
France
Address
Rue Jean-jacques Rousseau 155, Technopolis 40
92138 Issy Les Moulineaux
LOUGHBOROUGH UNIVERSITY
United Kingdom
Address
Ashby Road
LE11 3TU Loughborough