Browsing by Author "Mendecki, Maciej"

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Access status: Open Access ,
Próba wykorzystania metody potencjałów wzbudzonych do wykrywania zanieczyszczeń węglowodorami na obszarze postglacjalnym
(Wydawnictwa AGH, 2009) Żogała, Bogdan; Mendecki, Maciej; Pierwoła, Jolanta; Zuberek, Wacław M.
Oil contaminations of soils are connected with human activity, for instance military activity. Organic pollution finding is one of environmental protection problems. Our field investigation was carried out to localize oil contaminations with induced polarization method (IP). The studied area is situated in post-Soviet military fuel base. The area is covered by postglacial sediments. Part of selected experimental area was submitted to bioremediation process. IP measurements indicated the relationship between bioremediation area and increase of chargeability effect. Two types of electrodes were used for measurements: stainless steel and non-polarizable ones. The survey results confirmed more accuracy of non-polarizable electrodes for postglacial area conditions. This method could be used to monitor efficacy of bioremediation process of hydrocarbons contaminated soils as well.
Access status: Open Access ,
The application of electromagnetic methods for polymetallic prospecting in mining conditions
(Wydawnictwa AGH, 2017) Gołębiowski, Tomisław; Żogała, Bogdan; Mendecki, Maciej; Małysa, Tomasz
The paper presents selected results of geophysical surveys carried out in the »Polkowice-Sieroszowice« copper mine in Lower Silesia, Poland. The aim of complex geophysical measurements was the analysis of the usefulness of selected electromagnetic methods for locating ore mineralisation zones in mining conditions. The results were obtained from surveys conducted along profiles designed on the side-wall by the roof, in the middle and the floor of the excavation. Electromagnetic Profiling and Ground Penetrating Radar techniques were applied for outlining the mineralisation zones consisting of Cu, Pb and Fe. The variability of geophysical recordings depending on the degree of mineralisation and distribution of fractures induced by mining activity were analysed. The results of geophysical surveys were correlated to petrophysical parameters and laboratory data concerning the percentages of Cu, Pb and Fe in samples taken from the side-wall at the survey site.
Access status: Open Access ,
The effects of component rotation on H/V spectra: a comparison of rotational and translational data
(Wydawnictwa AGH, 2024) Nawrocki, Dariusz; Mendecki, Maciej; Teper, Lesław
The presented investigation focused on site effect estimations, specifically resonance frequency and amplification. These estimations were carried out for both rotational and translational signals, using waveforms from mining-induced seismic events. Site effect parameters were calculated using the horizontal-to-vertical spectral ratio (HVSR) technique, which is commonly applied to translational records by comparing the spectral ratio between horizontal and vertical components. In this study, we also applied the horizontal-to-vertical (H/V) ratio to rotational records. However, due to the different orientations of motion propagation, we introduced the spectral H/V ratio for rotational motion as the torsion-to-rocking spectral ratio (TRSR). Furthermore, we analyzed these signals according to two approaches. First, we estimated the site effect parameters for directly registered signals, and secondly, we considered rotated components by varying the angle from 0° to 180° in 5-degree increments. Generally, the H/V curves indicated two peaks for translational motions and four peaks for rotational motions. The averaged H/V spectra and spectra obtained for different angles of component rotation showed insignificant fluctuation in amplification values for both rotational and translational motions. However, when comparing each component’s spectrum for all angles, we observed changes in the site effect parameter values for both motion types. Radar plots depicting amplification values versus rotation angles for separated components revealed characteristic fluctuations, suggesting local anisotropy. Moreover, when comparing the radar plots between rotational and translational results, it was evident that rotational resonance frequencies shifted to higher frequency values, potentially indicating shallower geological layers as their source.