管沟对浅地层剖面图影响的多弧现象形成分析

摘要

为保证海底管线的安全，在海底管线外部调查中，获得管线的平面位置、埋深、裸露或悬跨高度是调查的重要内容，浅地层剖面仪可以有效地解决这一问题[1]。一些管沟明显地区，管线仪调查得到的管线图像出现多重线弧线现象，对管顶面的判别，管顶位置及管线埋深、裸露、悬跨高度的判断造成困难，文章结合海底管线铺设方法以及浅地层剖面仪工作原理，采用分解分析多重线弧状态的形成机理，并提出了在多弧现象中辨别管顶面以及管沟底的方法，以提高管线剖面资料处理的准确性。%In order to guarantee the subsea pipeline′s safety ,the subsea pipeline′s position ,buried depth , exposure or free⁃span status are important parts in subsea pipeline investigation. Pipeline detector is an effective equipment to solve this problem. For the area where new trench or trench that is not backfilled well exists ,multi parabolic curves are produced on sub⁃bottom profiler image for a single pipeline ,which makes it difficult for further interpretation ,such as distinguishment of pipeline top ,pipeline position and pipeline′s buried depth and its rela⁃tive status with seabed. In this paper ,the subsea pipe installation and working mechanism of sub⁃bottom profiler were analyzed ,and the cause of multi⁃curve state was investigated. A new method to distinguish trench bottom and pipeline top on sub⁃bottom profiler image was also proposed to improve the accuracy in sub⁃bottom profiler data pro⁃cessing.