Objectif The objectives of this project are: i) to simulate acoustic backscatter time series due to volume reverberation in the sea water, and ii) to develop estimators to determine various characteristics inof the water. The physics of volume reverberation in water both for continuous media and for discrete scatterers was modelled. The backscattered acoustic field is described in the form of second order statistical moments (auto correlation and cross correlation) of the (stochastic) acoustic waves. These moments drive an echo generator producing synthetic echoes for various transducer input signals. Based on these echoes, estimators have been developed to obtain information from the (sea) water, in particular flow velocity and sediment concentration. The performance of both the model and the estimators have been tested in a laboratory flume. The developed tools (software) should enable instrument manufacturers to design, test and optimize new marine instrumentation under a wide variety of conditions at home, before sailing out for sea trials, thus reducing considerably the costs of the latter.The simulations are based on (assumed) physical properties inof the water. The product(s) should support to developto get optimum performance of measuring methods based on wideband acoustic volume reverberation. In the present stage the work is confined to: longitudinal (Doppler) and transverse velocity profiling, and refraction index profiling (concentrations). Later applications are temperaturesalinity gradients and turbulence. The product(s) should be capable of replacing (expensive) field tests under poorly known conditions. The work contains the development of a physical model, a signal simulator, and wideband parameter estimators. It includes validation of the model and the estimators by laboratory experiments. Champ scientifique natural sciencescomputer and information sciencessoftwareengineering and technologyenvironmental engineeringremote sensingnatural sciencesphysical sciencesacoustics Programme(s) FP2-MAST 1 - Specific research and technological development programme (EEC) in the field of marine science and technology (MAST), 1989-1992 Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur MINISTRY OF TRANSPORT PUBLIC WORKS AND WATER MANAGEMENT Contribution de l’UE Aucune donnée Adresse Kortenaerkade 1 2500 EX DEN HAAG ('S-GRAVENHAGE) Pays-Bas Voir sur la carte Coût total Aucune donnée Participants (3) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Dune Srl Italie Contribution de l’UE Aucune donnée Adresse Via Sforza 14 00184 Roma Voir sur la carte Coût total Aucune donnée STICHTING WATERLOOPKUNDIG LABORATORIUM (WL/DELFT HYDRAULICS) Pays-Bas Contribution de l’UE Aucune donnée Adresse 185,Rotterdamseweg 185 2600 MH DELFT Voir sur la carte Coût total Aucune donnée Thomson Marconi Sonar SAS France Contribution de l’UE Aucune donnée Adresse 525,Route des Dolines 06903 Sophia Antipolis Voir sur la carte Coût total Aucune donnée
