Seafloor Topography Modelling in Northern Adriatic Sea Using Synthetic Aperture Radar

Underwater bottom topography may be visible on Synthetic Aperture Radar (SAR) images through the radar signature of ocean surface currents. Using SAR images and a limited number of echo soundings it is possible to constructs accurate depth maps, greatly reducing the costs of bathymetric surveying. Based on shallow water bathymetry synthetic aperture radar (SAR) imaging mechanism and the microwave scattering imaging model for oceanic surface features, we are working to develop a new method for shallow water depth retrieval from space-borne SAR images. Shallow waters in the northern part of Adriatic sea may represent favorable depth condition for underwater bottom topography estimation testing over large area, using SAR imagery, although such area does not show strong tidal currents. Strategy for northern Adriatic Sea seafloor modeling is presented, using the Bathymetry Assessment System (BAS). Evaluation is conducted using SAR imagery from different satellite platforms and in multitemporal framework, in cooperation with echo soundings from bathymetric surveying. Two monitoring sites supply in situ data, such as water level, current flow, wind velocity and direction. Physical conditions evaluation in the study site supports selection of the best SAR images for depth estimation. Multisensor approach will give the possibility to evaluate differences in bottom topography estimation from sensor with different characteristics.