Objectif 3 remoteote sensing methods for obtaining information on sea bottom topography have been investigated: passive optical bathymetry, sunglint observation and radar observation. Optical and microwave remotely sensed data as well as extensive in situ data, including a detailed bathymetric map, were gathered in a sand wave area off the Dutch coast. These data were compared with each other and with model predictions. The models are based on the current state of the art, with some extensions. Passive optical bathymetry has limited use above the North Sea because of its limited depth range. Sunglint observation of bottom topography is possible, but its practical applicability is limited by the requirement of low wind speeds and cloudless weather. Radar observation with an imaging radar operating at long wavelengths has the highest potential. The agreement between radar data and model predictions is not always good, due to lack of knowledge on the basic processes. However, in cases where there is good agreement, the imaging model can be inverted numerically to retrieve depth information from radar images.PROJECT DESCRIPTION: Numerical models for the dynamic behaviour of the sea floor are currently being developed. These models need information on the sea bottom topography for their calibration and validation. Traditional bathymetric surveys are time and cost consuming. Remote sensing methods, however, can give information about the sea bottom over large areas at relatively low costs. In this project the mapping of the sea bottom in shallow seas will be studied with microwave and optical sensors. It is known that wave-current interactions cause roughness variations at the sea surface which can be detected both with imaging radar and with optical sensors. The usability of this phenomenon will be investigated in terms of mapping accuracy and resolution by performing an experiment in a sand wave region off the Dutch coast. Comparison of the experimental results to predictions from numerical models based on existing knowledge of the imaging mechanisms will yield important information about our understanding of the processes involved. This understanding is crucial for the development of routine procedures in other projects. Champ scientifique engineering and technologyelectrical engineering, electronic engineering, information engineeringelectronic engineeringsensorsoptical sensorsnatural sciencesphysical sciencesastronomyplanetary sciencesplanetary geologyengineering and technologyenvironmental engineeringremote sensingengineering and technologyelectrical engineering, electronic engineering, information engineeringinformation engineeringtelecommunicationsradio technologyradar 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 Kanaalweg 3b 2628 EB DELFT Pays-Bas Voir sur la carte Coût total Aucune donnée Participants (5) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Business Unit of TNO Built Environment and Geosciences Pays-Bas Contribution de l’UE Aucune donnée Adresse Van Mourik Broekmanweg 6 2628 XE DELFT Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée Christian-Albrechts-Universität Kiel Allemagne Contribution de l’UE Aucune donnée Adresse Olshausenstraße 40-60 24118 Kiel Voir sur la carte Liens Site web Opens in new window 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 TECHNISCHE UNIVERSITAET HAMBURG-HARBURG Allemagne Contribution de l’UE Aucune donnée Adresse Schellerdam 4 21073 HAMBURG Voir sur la carte Coût total Aucune donnée UNIVERSITY OF WALES - BANGOR Royaume-Uni Contribution de l’UE Aucune donnée Adresse College Road, Finance Office LL57 2DG BANGOR (GWYNEDD) Voir sur la carte Coût total Aucune donnée