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Application of geoelectrical profiling in the delineation of shallow periglacial structures on the Drohiczyn Plateau

Mieszkowski R, Dzierżek J., Stańczuk D.

Studia Quaternaria

2014

Vol. 31, Nr 2

73--81

The paper describes the results of geoelectrical sounding application for the delineation of periglacial structures in Wierzchuca Nagórna within the Drohiczyn Plateau (eastern Poland). The method records the variation of apparent resistivity of deposits along a selected horizontal direction. The survey utilizes a distinct geoelectrical contrast between glacial till and structures composed of sand that have been recognized earlier in the gravel pit wall. The studies have been conducted in direct hinterland of the gravel pit. Rectangular and concentric arrays were applied in the survey. The results have been presented as graphs and resistance distribution maps. The obtained geological image is not complete, although it shows an oriented course of the largest lineaments and traces of a network with a small mesh size (1.5–2 m). The recognized pattern of structures points to harsh climatic conditions during their formation. General orientation of the structures corresponds to the basic elements of the contemporary landscape in the area (slope, valley axes). Geoelectrical sounding using the rectangular array gave better results than in the concentric array, whereas introduction of brine into the system did not enhance the resolution of the readings. The presented resistance distribution maps with a characteristic rhythm of variations may serve as a benchmark for recognizing periglacial structures in areas without exposures.

Przydatność nowej sondy geoelektrycznej do charakterystyki litologicznej iłów warwowych z Plecewic k. Sochaczewa

Zawrzykraj P.

Przegląd Geologiczny

2005

Vol. 53, nr 8

677--681

This paper presents the results of the field research using a new, prototypical geoelectrical equip-ment, that were developed for the soil resistance (Borowczyk &Porzeżyński, 2003). These studies were carried out in Plecewice near Sochaczew, where an open pit with varved clays is situated. Lithological changeability of varved clays was determined by the author through detailed laboratory testing. Then the results of research were compared with those derived from the new geoelectrical equipment tests and were related to varve thickness qualitative and quantitative evaluation of the soils in the vertical profile with the novel method was demonstrated. Further, the geological situation of the investigated area is presented in this paper.