The examination of the structure of the upper layers of the seabed by the means of the parametric sonar

The acoustic methods as a non-invasive and teledetective are very good tools to study the stratification of bottom sediments, particularly useful as a research tool is a parametric sonar, which works together with other acoustic devices used for underwater observation, such as multibeam sonars and side scan sonars. Using the techniques of synthetic apparatus they can provide relatively a lot of information about the shape and the structure of the seabed. The results of the sounding of the bottom of the Gulf of Gdansk and the Southern Baltic Sea will be presented in the paper. Also there will be shown the pictures of both the seabed bathymetry and the profile of the stratification of the upper sphere of the seabed. These results have been precisely located in the geographical coordinates and compared with the results of geological investigations in the same area.