The principle of side scan sonar and its application in the detection of suspended submarine pipeline treatment

According to the underwater structure characteristics of suspended submarine pipeline after treatment, it can be divided into two types: non-permeable and permeable. They have different reflection characteristics in the side scan sonar detection images. According to this principle, the side scan sonar detection method can be used to detect and evaluate the treatment effect of suspended submarine pipeline. Before the treatment of suspended submarine pipeline, the pipeline shows strong reflection on the sonar image, and the gap between the pipeline and the seabed surface shows permeable reflection. If the method of "throwing sandbags combined with covering layer" is adopted, the permeable reflection on the sonar image will disappear, and the strong reflection image of the pipeline will coarsen and appear granular due to the filling of the gap. If the "underwater short pile support" and other permeable methods are adopted, the reflection characteristics of underwater short pile are only increased, and the permeable reflection still exists. (paper)