基于FDTD管线渗漏异常GPR数据的电场分量成像研究
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摘要
基于渗漏异常区的特点,提出一种管线渗漏异常GPR数据的电场分量成像技术,用以解决地下介质分布复杂情况下的渗漏异常区的准确识别.由于异常区含水量高,因此采用时间域有限差分法(FDTD)模拟不同介电参数的地质模型在GPR中的电磁波响应,通过正演模拟,反应介电常数差异与反射波能量成正比,差异越大,反射波能量越强.将此成像技术应用在实地管道渗漏探测中,试验结果表明:成像技术成效显著,管道渗漏异常在分量图谱中识别率高.
Based on the characteristics of abnormal leakage area, this paper presents an electric field component imaging technology for abnormal GPR data of pipeline leakage, which can be used to solve the accurate identification of abnormal leakage area under the complex distribution of underground medium. Because of the high water content in the abnormal region, the time domain finite difference method(FDTD) is used to simulate the electromagnetic wave response of different dielectric parameters in the GPR. Through the forward modeling,the difference of dielectric constant is proportional to the reflected wave energy, the greater the difference, the stronger the reflected wave energy. This imaging technique is applied to the detection of pipe leakage in the field. The experimental results show that the imaging technology has achieved remarkable results, and the pipeline leakage anomaly has a high recognition rate in the component map.
Based on the characteristics of abnormal leakage area, this paper presents an electric field component imaging technology for abnormal GPR data of pipeline leakage, which can be used to solve the accurate identification of abnormal leakage area under the complex distribution of underground medium. Because of the high water content in the abnormal region, the time domain finite difference method(FDTD) is used to simulate the electromagnetic wave response of different dielectric parameters in the GPR. Through the forward modeling,the difference of dielectric constant is proportional to the reflected wave energy, the greater the difference, the stronger the reflected wave energy. This imaging technique is applied to the detection of pipe leakage in the field. The experimental results show that the imaging technology has achieved remarkable results, and the pipeline leakage anomaly has a high recognition rate in the component map.
引文
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[2]刘澜波,钱荣毅.探地雷达:浅表地球物理科学技术中的重要工具[J].地球物理学报,2015(08):2606-2617.
[3]李华,鲁光银,何现启,等.探地雷达的发展历程及其前景探讨[J].地球物理学进展,2010(04):1492-1502.
[4]熊俊楠,孙铭,彭超,等.基于探地雷达的城镇燃气PE管道探测方法[J].物探与化探,2015, 39(05):1079-1084.
[5]冯,曾昭发,刘四新,等.探地雷达信号处理[M].科学出版社,2014.
[6]吴小平,何继善,柳建新.电磁波的阻抗变换作用对地质雷达探测效果的影响[J].地球物理学进展,2006,21(01):251-255.
[7]曾昭发,刘四新,王者江,等.探地雷达方法原理及应用[M].科学出版社,2006.
[8] Jol H M. Ground Penetrating Radar Theory and Applications[M]. Elsevier Science, 2009.
[9]冯德山,戴前伟,何继善,等.探地雷达GPR正演模拟的时域有限差分实现(英文)[J].地球物理学进展,2006, 1(02):630-636.
[10]张汉春,曹震峰.沙堆内小型管线的探地雷达模型实验研究[J].地球物理学进展,2010, 25(04):1516-1521.