侧扫声纳系统在管道穿越段海底地貌特征探测中的应用

APPLICATION OF SIDE SCAN SONAR TO EXPLORATION OF SUBMARINE PIPELINE LANDFORM CHARACTERISTICS

针对瓯江口区域潮汐强烈及浅水作用明显的特点,海底管道的敷设及安全运营危险性大、且无法用常规方法进行检测的问题,采用了侧扫声纳系统的海底声学技术对海底管道穿越段地貌特征进行了有效探测。本次探测工作对发现的平坦海底、大型沙波、潮沟、小型洼坑、蚀余凸起等自然微地貌和抛锚等形成的锚沟及其后期自然发育而成的次生微地貌进行了特征分析,分析结果对不同类型海底地貌提出解决对策以及有效地减轻不良地貌形态对海底管道稳定性影响具有重要意义[1]。

In the Oujiang river estuary area, there is a big risk in the laying and being operated safely of submarine pipeline. The conventional method to test can＇t be used because of the strong tide and obvious shoal water. This pa per uses subsea acoustic technology of side scan sonar to explore seafloor landform of the area where submarine pipelines go through effectively. Natural microrelief includes flat seafloor, large sand ridge, tidal creek, small pit, and alteration bulge. Anchor ditches are formed by dropping anchor and secondary microrelief developed naturaly later. They all are found and analysed. The result has an important significance to propose the corresponding solu tion countermeasures to different kinds of seafloor landforms and to reduce the topographic form influence on the sta bility of submarine pipeline.