Application of Multi-beam Sounding System and Side Scan Sonar in the Suspended Detection of Submarine Pipelines
The suspended state of subsea pipelines is crucial to the safe operation of these pipelines,making it a key focus of seabed surveys.To accurately assess the suspension sta-tus of pipelines in the Bohai Sea,we collected data and used multi-beam sounding and side-scan sonar on two suspended pipeline sections.After comparing the horizontal distances,suspended lengths,and suspended heights obtained from both methods with historical data,we find that,when detecting suspended pipelines outside the trench,the horizontal distances measured by multi-beam sounding ranges from 0.12 m to 0.67 m,whereas side-scan sonar measurements range from 0.39 m to 1.16 m.The discrepancies in suspended lengths be-tween the two methods range from 0.19 m to 0.67 m,and the maximum differences in sus-pended heights are between 0.09 m and 0.14m.When detecting suspended pipelines within the trench,the horizontal distances measured by multi-beam sounding range from 0.24 m to 0.79 m compared to historical data,while side-scan sonar measurements range from 0.71 m to 2.52 m.The discrepancies in suspended lengths between the two methods range from 0.35 m to 0.92 m,and the maximum differences in suspended heights are between 0.07 m and 0.13 m.Both methods prove effective in identifying suspended pipelines.However,multi-beam sounding demonstrates significantly higher accuracy than side-scan sonar,partic-ularly in situations involving scouring on both sides of suspended pipelines outside the trench or suspended pipelines within the trench,especially during adverse sea conditions.Based on project requirements,the paper recommends a combination of the two methods when condi-tions permit.
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