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Finite-difference time domain (FDTD) modeling of ground penetrating radar pulse energy for locating burial sites

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Akinsunmade A. , Karczewski J. , Mazurkiewicz E. , Tomecka-Suchoń S.

Acta Geophysica

2019

tom Vol. 67, no. 6

1945--1953

Analysis of the finite-difference time domain (FDTD) numerical simulation of ground penetrating radar (GPR) measurement for locating burial sites is described in this paper. Effective, efficient, and reliability interpretation of GPR field data obtained from clandestine sites is very crucial in forensic investigations. The main goal of the study is the prediction of the change in the interaction of the electromagnetic incident on changes in buried bodies with time. In order to achieve this, the research involves the modeling of the GPR electromagnetic pulse energy responses to simulated changes in buried body with time with a view to understand what the results of real field measurement will give. The field measurements were conducted with GPR system manufactured by Mala Geoscience with antennae frequency of 500 MHz, 250 MHz, and 100 MHz. Responses from both synthetic and field radargrams depict the target was intercepted at same time (approximately 25 ns). The results have demonstrated that FDTD modeling is an important tool for enhancing the reliability of GPR data interpretation particularly for forensic study.

Burial crypts in solid rock – a geophysical case study of a small church with a unique polychrome in Szydłów (S Poland)

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Zieliński A. , Łyskowski M. , Mazurkiewicz E. , Lubarska K. W.

tom Vol. 45, no. 2

89--97

Lesser Poland (Małopolska) is a historic region of Poland. The presented case study was undertaken in the All Saints’ Church in the town of Szydłów, in which conservation and restoration works were carried out to preserve Gothic wall paintings by identifying and eliminating the causes of their degradation, and these efforts were supported by geophysical surveying. The conducted studies constitute a step not only to determine the age of the construction of the Szydłów temple, but also to improve knowledge of medieval architecture and mural paintings in Lesser Poland. The geophysical research with application of GPR (Ground Penetrating Radar) helped to locate previously unknown structures under the temple floor. This survey indicated four, possibly connected, structural objects clearly visible in GPR profiles. Carried out works confirmed that anomalies visible on radargrams mark two crypts. This discovery of the hidden construction elements emphasizes and strengthens the earlier suppositions of the unique character of this temple.