Obiettivo 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. Campo scientifico natural sciencescomputer and information sciencessoftwareengineering and technologyenvironmental engineeringremote sensingnatural sciencesphysical sciencesacoustics Programma(i) FP2-MAST 1 - Specific research and technological development programme (EEC) in the field of marine science and technology (MAST), 1989-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento CSC - Cost-sharing contracts Coordinatore MINISTRY OF TRANSPORT PUBLIC WORKS AND WATER MANAGEMENT Contributo UE Nessun dato Indirizzo Kortenaerkade 1 2500 EX DEN HAAG ('S-GRAVENHAGE) Paesi Bassi Mostra sulla mappa Costo totale Nessun dato Partecipanti (3) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Dune Srl Italia Contributo UE Nessun dato Indirizzo Via Sforza 14 00184 Roma Mostra sulla mappa Costo totale Nessun dato STICHTING WATERLOOPKUNDIG LABORATORIUM (WL/DELFT HYDRAULICS) Paesi Bassi Contributo UE Nessun dato Indirizzo 185,Rotterdamseweg 185 2600 MH DELFT Mostra sulla mappa Costo totale Nessun dato Thomson Marconi Sonar SAS Francia Contributo UE Nessun dato Indirizzo 525,Route des Dolines 06903 Sophia Antipolis Mostra sulla mappa Costo totale Nessun dato
