POTENTIALITY OF BATHYMETRY MONITORING USING FISH FINDER DATA FOR SEDIMENT MANAGEMENT IN A WIDE AREA

The bathymetry data with high precision are derived from multibeam echo-sounder, but this survey is unsustainable for bathymetry monitoring because of high cost. In this study, we suggest the method to get the bathymetry changes in a wide area using fish finder data of shirasu fishing boats. This method is low cost, but possible to operate frequent monitoring. The depth differences of several ten centimeters are shown between the fish finder and multibeam sonar. However, it is confirmed that the trend of sea bottom in both the bathymetry is pretty similar.