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Article Type

Research Paper

Corresponding Author

Suzan El-Gharabawy

Highlights

Employing advanced sonar data and ROV observations along the coast of Alexandria, shaded significant seabed and sub-bottom features of this maritime region and also enhanced our under standing of underwater geomorphological and stratigraphic features and contribute in marine geology and environmental management.

The side scan sonar analysis, revealing a transition from rocky and boulder-rich seabed compositions near the shore to finer sediment compositions offshore which highlights specific environment within the coastal zone.

The sub-bottom profiling has recorded stratified sediments and distinct underlying beds which provided an opportunity to study the historical sedimentation processes and the previous ecological environments under the seabed and also showed the potential of such shallow seismic tool in uncovering geological features.

Abstract

This research presents a far reaching marine geophysical overview of the seabed and sub bottom features of the marine area of Alexandria City which known for its historical and ecological significance in the Mediterranean Sea providing deep understanding of the underwater geomorphological and stratigraphic features of this marine zone through using sonar technologies include Multibeam Echosounder (MBES), Side-Scan Sonar (SSS), and Sub-Bottom Profiler (SBP) along with Remote Operated Vehicle (ROV). The survey design is considered a detailed exploration of the seabed topography, texture, and sub-seafloor features. Initial outcomes from this oceanographic survey show a complex structure including different sediment deposits, rocky outcrops, and potential marine habitats which offering new experiences into the ecological complexity of the area. Also, the sub-bottom profiling has been particularly effective in mapping different sedimentary package and the stratigraphic deposition and providing valuable data of the geological history above the bedrock. The results of sonar data and ROV images integration, in mapping underwater seabed morphology, are expected to contribute to the fields of marine geology, environmental management, and historical research. The outcomes of this study can potentially inform future conservation efforts and support the sustainable management of this significant marine area.

Keywords

Environmental management, Marine geophysical survey, Sub-bottom profiling, Side scan sonar, Multibeam echosounders, Remote operated vehicles

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