Numerical Simulation of the Wave-Guide Effect of the Near-Surface Thin Layer on Radar Wave Propagation

Liu, Lanbo; Arcone, Steven A.

doi:10.4133/jeeg8.2.133

Cited by 41 publications

(18 citation statements)

References 17 publications

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“…This change is likely a direct result of the signal reflection from the boundary between QS and the magnetite at a depth of 0.035 m. In addition, the signal characteristics are likely altered by the different propagation of the ground wave. The presence of the lowervelocity magnetite layer turns the overlying QS layer into a thin high-velocity waveguide (e.g., Liu and Arcone, 2003;Strobbia and Cassiani, 2007;van der Kruk et al, 2009).…”

Section: Magnetite Layer (Pd)mentioning

confidence: 99%

Effects of magnetite on high-frequency ground-penetrating radar

et al. 2013

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Large concentrations of magnetite in sedimentary deposits and soils with igneous parent material have been reported to affect geophysical sensor performance. We have undertaken the first systematic experimental effort to understand the effects of magnetite for ground-penetrating radar (GPR) characterization of the shallow subsurface. Laboratory experiments were conducted to study how homogeneous magnetite-sand mixtures and magnetite concentrated in layers affect the propagation behavior (velocity, attenuation) of high-frequency GPR waves and the reflection characteristics of a buried target. Important observations were that magnetite had a strong effect on signal velocity and reflection, at magnitudes comparable to what has been observed in small-scale laboratory experiments that measured electromagnetic properties of magnetite-silica mixtures. Magnetite also altered signal attenuation and affected the reflection characteristics of buried targets. Our results indicated important implications for several fields, including land mine detection, Martian exploration, engineering, and moisture mapping using satellite remote sensing and radiometers.

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Section: Magnetite Layer (Pd)mentioning

confidence: 99%

Effects of magnetite on high-frequency ground-penetrating radar

et al. 2013

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“…Several of these events may be highly dispersive, which has been treated [12][13][14], but only for horizontal layers. The dispersion is generated because the wedge is initially much less than an in situ wavelength in thickness, and it is complicated by thickness changes.…”

Section: Discussion Of the Modeling Resultsmentioning

confidence: 99%

“…These interfacial solutions substantially differ from those for free space, as discussed by many authors [9][10][11]. Arcone [12] Arcone et al [13] and Liu and Arcone [14] treated the dispersive propagation caused by a thin layer with a 2-dimensional (2-D) finite difference time domain (FDTD) numerical model. Liu and Arcone [14] demonstrated how the near-surface stratigraphic structure plays an important role for different antenna polarization modes.…”

Section: Introductionmentioning

confidence: 96%

“…Arcone [12] Arcone et al [13] and Liu and Arcone [14] treated the dispersive propagation caused by a thin layer with a 2-dimensional (2-D) finite difference time domain (FDTD) numerical model. Liu and Arcone [14] demonstrated how the near-surface stratigraphic structure plays an important role for different antenna polarization modes. Numerous studies with FDTD were also carried out on the coupling of different types of GPR antennas with heterogeneous ground [e.g., [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Propagation of Radar Pulses from a Horizontal Dipole in Variable Dielectric Ground: A Numerical Approach

Liu

Arcone

2005

Subsurf Sens Technol Appl

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We numerically investigate the propagation of radar type short pulses from a horizontal dipole in the presence of some simple models of inhomogeneous ground with a flat surface. We use 3-dimensional (3-D) pseudospectral time domain (PSTD) and 2-D finite difference time domain forward modeling to determine the range and azimuth dependence of electric field components and to simulate events in a moveout profile. The models are: (i) a uniform half space with either high or low conductivity; (ii) a vertical dielectric wedge; (iii) a surface thin layer with a monocline wedge overlaid on the dielectric half space. Our homogeneous results agree with the analytical solutions, and more clearly show the significant vertical electric field component, which occurs for all models. The incorporation of an anomalous dielectric quadrant does not affect the air wave and only complicates ground wave propagation near the boundary. Modeling of a monocline dielectric wedge shows predictable subsurface reflections and refractions, some of which are highly dispersive events, depending on the direction of propagation. We present two field examples that appear to demonstrate some of our findings. We conclude that air waves make suitable references for moveout profiles regardless of dielectric complications, and that our results provide some insight into the interpretation of unique events seen in moveout profiles.

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“…HAN and WANG (2001) modeled the coupling of the elastic SH wave and the TE mode electric field by a fast finite-element time-domain method. This paper presents a numerical modeling scheme that models the fully coupled seismoelectric wave propagation using the pseudo-spectral time domain (PSTD) method (LIU, 1997, LIU andARCONE, 2003). We are particularly interested in the case of a seismic wave propagating through a porous medium with the presence of an externally exerted electric field, by the stimulation of observed results from a physical experiment conducted at a petroleum exploration site.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Effect of a DC Electric Field on Seismic Wave Propagation with the Pseudospectral Time Domain Method

Liu

Xiao

Liu³

et al. 2006

Pure appl. geophys.

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Abstract-We have modeled the effect of a direct current (DC) electric field on the propagation of seismic waves by the pseudospectral time domain (PSTD) method, based on a set of governing equations for the poroelastic media. This study belongs to the more general term of the seismoelectric coupling effect. The set of physical equations consists of the poroelastodynamic equations for the seismic waves and the Maxwell's equations for the electromagnetic waves; the magnitude of the seismoelectric coupling effect is characterized by the charge density, the electric conductivity, the Onsager coefficient, a function of the dielectric permittivity, the fluid viscosity, and the zeta potential. The poroelastodynamic vibration of a solid matrix generates an electric oscillation with the form of streaming current via the fluctuation of pore pressure. Meanwhile, fluctuating pore pressure also causes oscillatory variation of the electric resistivity of the solid matrix. The simulated poroelastic wave propagation and electric field variation with an existing background DC electric field are compared with the results of a physical experiment carried out in an oilfield. The results show that the DC electric field can significantly affect the propagating elastic energy through the seismoelectric coupling in a wide range of the seismic frequency band.

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Numerical Simulation of the Wave-Guide Effect of the Near-Surface Thin Layer on Radar Wave Propagation

Cited by 41 publications

References 17 publications

Effects of magnetite on high-frequency ground-penetrating radar

Effects of magnetite on high-frequency ground-penetrating radar

Propagation of Radar Pulses from a Horizontal Dipole in Variable Dielectric Ground: A Numerical Approach

Numerical Simulation of the Effect of a DC Electric Field on Seismic Wave Propagation with the Pseudospectral Time Domain Method

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