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首页> 外文期刊>Journal of geophysics and engineering >Modelling of ground penetrating radar data in stratified media using the reflectivity technique
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Modelling of ground penetrating radar data in stratified media using the reflectivity technique

机译:使用反射率技术对分层介质中的探地雷达数据进行建模

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摘要

Horizontally layered media are often encountered in shallow exploration geophysics. Ground penetrating radar (GPR) data in these environments can be modelled by techniques that are more efficient than finite difference (FD) or finite element (FE) schemes because the lateral homogeneity of the media allows us to reduce the dependence on the horizontal spatial variables through Fourier transforms on these coordinates. We adapt and implement the invariant embedding or reflectivity technique used to model elastic waves in layered media to model GPR data. The results obtained with the reflectivity and FDTD modelling techniques are in excellent agreement and the effects of the air-soil interface on the radiation pattern are correctly taken into account by the reflectivity technique. Comparison with real wide-angle GPR data shows that the reflectivity technique can satisfactorily reproduce the real GPR data. These results and the computationally efficient characteristics of the reflectivity technique (compared to FD or FE) demonstrate its usefulness in interpretation and possible model-based inversion schemes of GPR data in stratified media.
机译:在浅层勘探地球物理学中经常会遇到水平分层的介质。可以通过比有限差分(FD)或有限元(FE)方案更有效的技术对这些环境中的探地雷达(GPR)数据进行建模,因为介质的横向同质性使我们可以减少对水平空间变量的依赖通过对这些坐标进行傅立叶变换。我们适应并实现了不变的嵌入或反射技术,该技术用于对分层介质中的弹性波进行建模以对GPR数据进行建模。使用反射率技术和FDTD建模技术获得的结果非常吻合,并且通过反射率技术可以正确考虑空气-土壤界面对辐射方向图的影响。与真实广角GPR数据的比较表明,反射率技术可以令人满意地重现真实GPR数据。这些结果和反射率技术(与FD或FE相比)的计算效率高的特性证明了其在分层介质中GPR数据的解释和可能基于模型的反演方案中的有用性。

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