| 最小结构磁化率成像反演方法在水下目标探测中的应用 |
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| 引用本文： | 胡正旺,吕邦来,杜劲松,孙石达,陈超.最小结构磁化率成像反演方法在水下目标探测中的应用[J].地球科学,2021,46(9):3376-3384. |
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| 作者姓名： | 胡正旺 吕邦来 杜劲松 孙石达 陈超 |
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| 作者单位： | 1.中国地质大学地球物理与空间信息学院, 地球内部多尺度成像湖北省重点实验室, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目42174090国家自然科学基金项目41804067国家自然科学基金项目41604060 |
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| 摘 要： | 磁测技术对发现和确定水下目标十分有效，已被广泛用于探测水下沉船、水下掩埋管线、电缆和其他(电)磁性物体.然而，水下目标往往具有较强的剩磁与退磁特点，影响了定性解释结果和定量计算精度.为了更精准地确定和刻画水下目标的位置与形状，以磁异常模量数据为基础，采用最小结构模型进行磁化率成像反演；在模型试验中采用了L1范数和L2范数分别进行反演，并且对两者结果进行了对比分析，结果显示L1范数反演结果具有更为规则与清晰的边界，而L2范数反演结果则相对更为平滑.因此，对于常见水下目标磁测，L1范数反演更适合.以港珠澳大桥沉管隧道磁测数据为例，基于磁异常模量的最小结构模型反演了水下沉管的埋设状态，其平面位置、宽度和埋深具有较好的精准度.因此，本方法能够基于磁测数据更加精细地计算水下掩埋目标的位置和规模，具有较强的实际应用价值.
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| 关 键 词： | 水下目标 磁法探测 磁异常模量 最小结构反演 磁化率成像 地球物理 |
| 收稿时间： | 2020-11-04 |
Application of Susceptibility Imaging Method by Minimum-Structure Inversion to Underwater Target Detection |
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| Hu Zhengwang,Lü Banglai,Du Jinsong,Sun Shida,Chen Chao.Application of Susceptibility Imaging Method by Minimum-Structure Inversion to Underwater Target Detection[J].Earth Science-Journal of China University of Geosciences,2021,46(9):3376-3384. |
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| Authors: | Hu Zhengwang Lü Banglai Du Jinsong Sun Shida Chen Chao |
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| Abstract: | Some defects still exist in the magnetic survey for the underwater targets especially in case of the objects with small sizes. In general, the interpretation is dominated by qualitative approach and the accuracy of the quantitative results is low, which is mainly caused by the remanent magnetization and the self-demagnetization in the underwater targets. These have great impact on the analysis and inversion of the magnetic anomaly data. To obtain a robust result, the minimum-structure inversion is applied to the magnetic magnitude transform data to image the location and shape of the underwater target. In the inversion, the L1 norm and L2 norm are utilized respectively to measure the complexity of the susceptibility structure. The corresponding results show that, to recover the cuboid model, the results by the L1 norm has much clearer boundaries and that by the L2 norm much smoother. Therefore, to detect the common underwater objects, the L1 norm is more appropriate to be adopted in the inversion. Moreover, the susceptibility imaging method is applied to the field data in the island-tunnel project for the Hong Kong-Zhuhai-Macao Bridge. The practical results verify that the horizontal location, width and depth of the underwater covered pipelines can be accurately determined by the minimum-structure inversion of the magnetic magnitude transform. In short, both the synthetic and the field examples indicate that the susceptibility imaging method in this paper, can calculate the locations and sizes of the underwater covered objects accurately and thus the method is valuable to be applied to the field data. |
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