Radosław Mieszkowski
University of Warsaw
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Featured researches published by Radosław Mieszkowski.
International Communications in Heat and Mass Transfer | 1999
Stanisław J. Matysiak; Radosław Mieszkowski
Abstract The aim of this contribution is to present the homogenized model of the diffusion processes in microperidic stratified bodies. The considerations are based on the linear Ficks theory of diffusion and the procedure of microlocal modelling [11]. The obtained model takes into account certain microlocal structure of the body. As the illustration of the application of presented model, a simple example is given.
Studia Quaternaria | 2014
Maciej Maślakowski; Sebastian Kowalczyk; Radosław Mieszkowski; Kazimierz Józefiak
Abstract Geological and geotechnical engineering field tests, like structure drillings and dynamic (DPL, DPSH) or static probing (CPT), are considered for a fundamental source of information about soil and water environments. Since Eurocode 7 has been introduced, it has become more common to use also dilatometers (DMT) or pressure meters (PMT). Results obtained using all the mentioned tests are always of a discrete nature - information is provided in certain points in the field. However, they determine the basis for creating spatial models of geological structure and geotechnical condi- tions of a substratum. The range and number of investigations conducted (including drilling, probing and laboratory tests) influence precision, in which a geological structure is identified and thus, also affect probability of compatibility between spatial model and real geological conditions of a substratum. In the paper, results of non-invasive electrical resistivity tomography (ERT) method are presented, comprising 2-dimensional image of a soil medium resistance. Electrical resistance is a parameter that reflects diversification of a soil medium, considering its lithological aspect. In addition, when combined with drilling results, it can be used to accurate determination of boundaries between soil layers. Carrying out of ERT tests in the field during expressway construction contributed to identification of weak, low-strength soils like organic soils (peat, aggradated mud) and of soft consistency cohesive soils. These kinds of soil are the main cause for unacceptable deformations appearing in the new road engineering structure.
2012 14th International Conference on Ground Penetrating Radar (GPR) | 2012
N. Boubaki; A. Saintenoy; S. Kowlaczyk; Radosław Mieszkowski; F. Welc; J. Budziszewski; Piotr Tucholka
A Ground-penetrating Radar has been used to map a 100 m2 area suspected to be above a network of galleries remaining from flint prospection during the neolithic period. Twenty profiles have been acquired. Their interpretation, gives evidence for banded flint layers dipping to the North, and underground remaining galleries.
Studia Quaternaria | 2014
Grzegorz Pacanowski; Paweł Czarniak; Anna Bąkowska; Radosław Mieszkowski; Fabian Welc
Abstract This paper addresses the problem of assessing the leakproofness of the bottom of a deep foundation trench, secured by cavity wall, using geophysical methods of electrical resistivity tomography. The study was conducted on a large construction project in Lublin, in a place where there are complicated soil-water conditions: the groundwater level is above the proposed depth of foundation trench, the subsoil is heterogeneous, and there are karsted and weathered carbonate sediments with confined aquifer below the bottom of the trench. A hydraulic fracture occurred at the bottom of the trench during the engineering works, which caused the water flow into the trench. In order to recognize the soil-water conditions the first stage of geophysical measurements of electrical resistivity tomography (ERT) was made. The applied methodology allowed to determine the extent of the hydraulic fracture zone within the bottom of foundation trench. In order to assess the leakproofness of Diaphragm Wall the geophysical ERT measurements were repeated (stage 2) A clear reduction in the value of the electrical resistivity of soils in the area of hydraulic fracture was caused by clay injection. The results of ERT measurements are discussed and graphically presented.
Studia Quaternaria | 2014
Radosław Mieszkowski; Jan Dzierżek; Dominik Stańczuk
Abstract The paper describes the results of geoelectrical sounding application for 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 a glacial till and structures composed of sand that have been recognized earlier in a 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.
Studia Quaternaria | 2013
Fabian Welc; Jerzy Trzciński; Sebastian Kowalczyk; Radosław Mieszkowski
Abstract Geophysical investigations in West Saqqara area were part of the archaeological fieldwork of the Polish-Egyptian Archaeological Mission during the campaign in 2012. The main purpose of geophysical prospection using the ground-penetrating radar (GPR) was to determine the location of potential underground sepulchral structures in Saqqara necropolis. During the GPR survey, optimal depth penetration was achieved due to dry rocks and monolithic structure of ancient cemetery. Using antenna of 100 MHz, the depth of penetration was up to 45 m and with antenna of 250 MHz, up to 15 meters. Three main groups of archaeological structures were identified: Greco-Roman sarcophagi and mummies, brick-stone chapels and accompanying burial shafts; mobile objects (solid rock blocks as fragments of tombs). One of the main goal of the GPR survey was to track the route of the western part of the Dry Moat, expressed by a wide and shallow depression spreading towards north-south. It suggests that Saqqara plateau is an ideal site for using GPR surveying technology.
International Journal of Engineering Science | 2001
Stanisław J. Matysiak; Radosław Mieszkowski
Abstract The paper deals with problems of modelling of diffusion processes in microperiodic two-layered elastic solids. By using the homogenization procedure with microlocal parameters and relations of the linear-coupled theory of diffusion in elastic homogeneous bodies a homogenized model accounting certain local effects of stresses, diffusion fluxes is derived. As an example illustrating the application of the presented model the stationary problem of diffusion in a microperiodic stratified elastic layer is considered.
Studia Quaternaria | 2017
Fabian Welc; Radosław Mieszkowski; Goranka Lipovac Vrkljan; Ana Konestra
Abstract In 2016 within the RED Project Roman Economy in Dalmatia: production, distribution and demand in the light of pottery workshops, 5 selected areas around the Podšilo Bay were geophysically surveyed. During the fieldworks in the Lopar protected area, located in the northeastern part of the Island of Rab a gradiometer, ground-penetrating radar (GPR) and electrical resistivity tomography (ERT) were used. The main aim of the project was to document presence of the Roman architecture in two areas of the bay’s hinterland as suggested earlier by finds of pottery and glass. Geophysical studies conducted in the Lopar area revealed presence of underground remains of ancient structures, probably from the late Roman period and connected with a ceramic production centre at the present seashore. The most interesting results were obtained for the area no. 4, the site where magnetic, georadar and ERT surveys revealed an ancient regular building at 0.4-0.6 m depth. The survey performed in the Lopar area clearly indicates that integration of different geophysical methods enables detailed and effective identification of buried archaeological structures.
Studia Quaternaria | 2016
Fabian Welc; Radosław Mieszkowski; Lawrence B. Conyers; Janusz Budziszewski; Artur Jedynak
Abstract Geophysical surveys conducted in order to map tunnels and vertical shafts at the Neolithic chert mining field Krzemionki used a ground-penetrating radar(GPR to test hypotheses regarding orientation, depth and subsurface complexity of these voids.Using two-dimensional reflection profiles the vertical shafts, now mostly filled with lithic debris, were easily visible. Amplitude mapping visualized debris at shaft margins as well as a collapsed material inside the voids. Some shallower horizontal tunnels were also visible as sub-horizontal planar reflections generated from both ceiling and floors of these void spaces. Extension of these interpretations to un-mapped areas of the ancient mining district and complexity of these prehistoric mining features could be examined to determine excavation intensity and exploitation techniques used during the Neolithic.
Studia Quaternaria | 2014
Łukasz Kaczmarek; Radosław Mieszkowski; Marcin Kołpaczyński; Grzegorz Pacanowski
Abstract The article shows the results of geophysical surveys performed by using Electrical Resistivity Tomography (ERT) method on selected region of Płock slope of a Tumski hill near Basilica of Assumption of the Blessed Virgin Mary in Płock and in Maszewo by the Vistula River a few kilometers north of Płock. The above-mentioned sections were selected due to landslide phenomena observed there. Geophysical surveys were conducted in order to verify the state of the distribution of electrical resistivity in the sectors where mass movement was identified. The electrofusion cross-section near Cathedral Basilica shows clays and sands. Also in ERT prospection a zone of loose soils with high resistance is clearly visible. The results of the ERT method from Maszewo, indicates historical land surface of a landslide and that the slope in Maszewo consists of cohesive deposits. In order to describe these particular issues, geological cross-sections and safety factor obtained by calculation are presented for the analyzed parts of the slope. The safety factor shows that probability of landslide activity near Cathedral Basilica is very unlikely and in Maszewo is very high