探地雷达管道探测运动学与动力学特征模拟分析
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摘要
本文简要介绍了时域有限差分与射线追踪法管道探测探地雷达(GPR)响应数值模拟的原理及过程。讨论了基于单道反射的GPR剖面上圆柱状管道的回波时—距方程及其双曲线特征。对不同材质与管内充填不同性质流体的管道GPR响应进行了物理模拟与数值模拟研究。模拟研究结果表明:管道周围介质导电率越高,对雷达波的吸收衰减越强,来自管道顶、底回波能量越弱,同相轴幅度越低。
In this paper,the principle and process of numerical simulation of GPR response in pipeline detection by finitedifference time-domain and ray-tracing method are briefly introduced. The echo time-distance equation and hyperbolic characteristics of cylindrical pipe on GPR profile based on single reflection are discussed. Physical simulation and numerical simulation of GPR response of pipe filled with fluid of different properties with different materials were carried out. The simulation results show that:the higher the conductivity of the medium around the pipe,the stronger the absorption attenuation of the radar wave,the weaker the echo energy from the top and bottom of the pipe,and the lower the amplitude of the in-phase axis.
In this paper,the principle and process of numerical simulation of GPR response in pipeline detection by finitedifference time-domain and ray-tracing method are briefly introduced. The echo time-distance equation and hyperbolic characteristics of cylindrical pipe on GPR profile based on single reflection are discussed. Physical simulation and numerical simulation of GPR response of pipe filled with fluid of different properties with different materials were carried out. The simulation results show that:the higher the conductivity of the medium around the pipe,the stronger the absorption attenuation of the radar wave,the weaker the echo energy from the top and bottom of the pipe,and the lower the amplitude of the in-phase axis.
引文
[1]Annan A P.Ground-penetrating radar principles,procedures&applications[M].Canada:Sensors and Software Inc,2003.
[2]Davis J L,Annan A P.Ground-penetrating radar for high-resolution mapping of soil and rock stratigraphy[J].Geophysical Prospecting,1986,(37):531-551.
[3]王惠廉.地质雷达概论[J].地球科学----中国地质大学学报,1993,18(3):249-256.
[4]Czarnowski J,Heinze S,Bruhl,P,et al.Pipeline projects in Germany using GPR:Proc.5th Internat.Conf.on GPR,Expanded Abstracts,Univ.of Waterloo.1107-1113.
[5]Graf,F.L.,1989,Use of Ground-penetrating radar to pinpoint natural gas pipeline leaks:59th Ann.Internat.Mtg.,Soc.Expl.Geophys.,Expanded Abstracts.226-228.
[6]Nagashima Y,Saito H,Kobayashi S,et al.1995,Automatic recognition of hyperbolic patterns in underground cross-sectional images:Proc.SAGEEP,Env.Eng.Geophys.Soc.,Expanded Abstracts,953-956.
[7]Shihab S.,Al-Nuaimy W.Radius estimation for cylindrical objects detected by ground-penetrating radar[J].Subsurface sensing technologies and applications,2005,6(2):151-166.
[2]Davis J L,Annan A P.Ground-penetrating radar for high-resolution mapping of soil and rock stratigraphy[J].Geophysical Prospecting,1986,(37):531-551.
[3]王惠廉.地质雷达概论[J].地球科学----中国地质大学学报,1993,18(3):249-256.
[4]Czarnowski J,Heinze S,Bruhl,P,et al.Pipeline projects in Germany using GPR:Proc.5th Internat.Conf.on GPR,Expanded Abstracts,Univ.of Waterloo.1107-1113.
[5]Graf,F.L.,1989,Use of Ground-penetrating radar to pinpoint natural gas pipeline leaks:59th Ann.Internat.Mtg.,Soc.Expl.Geophys.,Expanded Abstracts.226-228.
[6]Nagashima Y,Saito H,Kobayashi S,et al.1995,Automatic recognition of hyperbolic patterns in underground cross-sectional images:Proc.SAGEEP,Env.Eng.Geophys.Soc.,Expanded Abstracts,953-956.
[7]Shihab S.,Al-Nuaimy W.Radius estimation for cylindrical objects detected by ground-penetrating radar[J].Subsurface sensing technologies and applications,2005,6(2):151-166.