High-precision 3D terrain detection technology of underwater shipwreck:A case study of Laoniu reef shipwreck
Underwater wrecks are an integral part of marine archaeology.Multi-beam acoustic telemetry is an effective means to achieve safe and efficient detection of underwater shipwrecks.Based on the multi-angle and multi-method topography survey of the Laoniu reef shipwreck,the topography and occurrence status of the small topographic anomalous shipwreck site were obtained,which was about 10.5 m long and 3.6 m wide,and the length of the shipwreck compartment plate was about 1.8～3 m,and it was only about 10～20 cm above the seabed,these are consistent with the results of diving exploration.Through data analysis and comparison,the impact of factors such as probe distance,ship speed,and occlusion on the resolution of underwater wrecks is given.Based on theoretical principles and practical maritime investigation work,the main ways to improve the accuracy of underwater shipwrecks detection are to focus on scanning angle,to slow down speed during operation,and to design multi-directional reciprocating survey lines etc.
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