1887

Abstract

Summary

In some cases, the upper part of the section is represented by sands with a certain amount of coarse clastic material in the form of blocks measuring 30–100 cm. For an antenna of 250–300 MHz, the center frequency of the spectrum of the reflected signals is 180–200 MHz. It is easy to calculate that at a velocity 10 cm / ns, the wavelength will be about 0.5 m. This is the optimal size of the heterogeneity at which diffraction is formed in the form of a hyperbolic reflection on a georadarogram. If the block material is scattered evenly throughout the section, you can try to determine the effective propagation velocity of electromagnetic signals for different depths and more accurately recalculate the time section into a deep one. In this paper, an example of the results obtained at the Aleksandrovsky Plateau in the area of the geophysical test site of Moscow State University in the Kaluga region considers an algorithm for recalculating time sections into deep ones taking into account the use of multiple hyperboles from diffraction points. For sandy - gravel soils containing single boulders and large blocks, it is possible, using hyperbolic reflections from diffracting objects, to construct a model of a velocity section. Further transformations make it possible to change time boundaries into deep ones and build deep sections, which take into account the change in velocity with depth.

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/content/papers/10.3997/2214-4609.201901781
2019-04-16
2024-03-29
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References

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