起伏地形条件下侧扫声呐探测存在的问题及改进方法——以海底管道检测为例

Thelmpacts of Complex Terrainto the Side Scan Sonar Detection:The example of the Submarine Pipeline Inspection

基于海底管道的检测数据,讨论了起伏地形对传统侧扫声呐探测结果的影响,为起伏地形条件下应用侧扫声呐探测海底管道的调查方案设计、探测精度优化提供参考。研究表明:海底管道周边存在的冲刷槽以及堆积体等复杂地形对侧扫声呐探测有遮挡效应,测量过程中需控制拖体与目标物的相对位置,保证有效覆盖,避免漏测;根据区域地形分布特征,海底跟踪时通过手动设置符合整体地形走势的水深值,忽略小规模起伏地形对拖体高度取值的影响,可有效降低斜距改正后平面位置偏离及目标物的形态畸变;分析了地形起伏的影响因素(k)对海底管道出露及悬空高度计算结果的影响,通过几何近似和简化,提出了海底管道出露及悬空高度计算结果改进方法,并应用该方法对已知管径的海底管道进行了验证,修正后管径反演值的绝均差和均方差都减小为原来的10%左右,可供侧扫声呐数据解释借鉴。

Based on the submarine pipeline inspection data, discusses the complex terrain’s impact to the side scan sonar detection, which is good at optimizing the survey scheme and the side scan sonar interpretation in submarine pipeline inspection. The conclusion includes: The complex terrain such as scouring depression and small accumulation nearby would shading the pipeline, therefore it is necessary to control the relative position between pipeline and the towfish to avoid omission. Manually adjusting the height of tow fish caused bycomplex terrain can reduce the position distortion effectively. analyzed the impaction ( k ) of complex terrain to the calculated height of suspend pipeline and inverted the pipeline diameter, the calculation accuracy is significantly improved.