[HQR05-04] Visualization of coastal seafloor by multibeam echosounder: from coral reefs to naval battle site
Keywords:MBES bathymetric survey, shallow seafloor survey, geomorphology, underwater cultural heritage, war ruin
In this presentation, we introduce the possibility of visualization of shallow coastal seafloor based on our researches: coral reefs in the Ryukyu Islands, submerged tropical karst features and abundant living corals discovered in Nagura Bay on Ishigaki Island, Yarabeoki underwater site which contains iron grapnel anchors and early modern Okinawa ceramic jars (16-19th Centuries) off the western coast of Ishigaki Island, a battleship USS Emmons that sank in 40m of water off Okinawa Island due to inability to navigate after kamikaze attack at the end of World War II.
Coastal zones have always had a close relationship with the human society since the beginning of human civilization. However, there is very little scientific knowledge on coastal areas despite their closeness to human settlements. It is a field where advanced research can be promoted by collaboration between geoscience and archeology.