Practical Application of Various Geophysical Exploration Techniques in Pre-Survey for Submarine Cable Laying
The pre-survey of submarine cable laying is an important step to ensure the safety and effectiveness of the laying.Taking the route survey of a submarine cable in Bohai Sea as an example,this article introduces in de-tail the installation methods,operation procedures,data processing,and matters needing attention in the work of four commonly used marine survey instruments:multi-beam,side-scan sonar,shallow seismic profiler,and magnetometer.Through project practice,it is concluded that the combined use of multi-beam and side-scan sonar can obtain more accurate data information above the seabed.Multi-beam can provide accurate water depth and various position infor-mation,while side-scan sonar can provide qualitative conclusions on various features.The combined use of shallow seismic profiler and magnetometer can provide more comprehensive information on the thickness of subsea sedi-ments,pipeline position,and burial depth.The comprehensive application of multiple instruments can improve the accuracy and efficiency of pipeline laying pre-survey and reduce potential risks.However,data fusion and processing between different instruments are also a challenge,and appropriate data processing and analysis methods need to be adopted to ensure reliable results.
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