Scholarly record

PERSPECTIVES FOR SHALLOW WATER BATHYMETRY MAPPING USING ECHO-SOUNDING DATA AND UAV SURVEYS IN BULGARIAN BLACK SEA COASTAL ZONE

Lyubomira Trendafilova, Dobroslav Dechev

Abstract

The intensive development of remote sensing and unmanned aerial vehicles, and the accessibility of small drones, provide excellent opportunities for shallow water bathymetric surveys on the northern Bulgarian Black Sea coast. The combination of erosional/abrasional and depositional natural coastal types allows testing and assessing the efficiency of aerial surveys for bathymetric mapping. The Bay of Chernomorets is an excellent opportunity to combine data from single-beam sonar, multi-beam sounding and shooting with an unmanned aerial vehicle system. At present, the bay of research is strongly anthropogenically modified by the port in its southern part. In recent years, systematic studies of the landform changes have shown that the seabedforms, the beach and the shallowest part up to 2 meters depth have changed. This is the main reason to chose a solution that allows 3D reconstruction of Chernomorets Bay. One of the publication purposes is to review the research via echo sounders and unmanned aerial systems along the Bulgarian Black Sea coast and analyze the methodology, equipment and obtained results. The main task is to use good practices and successful methodology to combine echo-sounding and UAV surveys to derive a modern digital model of the terrain and raster data for the Bay of Chernomorets. Additionally, the article aims to evaluate the accuracy of UAV-based DSMs, high-resolution orthomosaics and singlebeam echo-sounding data, which are fundamental for studying the most dynamic coastal landforms along the Bulgarian Black Sea coast.

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DOI resolver: doi.org/10.5593/sgem2021/2.1/s10.70

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