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2 Przegląd Geologiczny

2 2017

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Zastosowanie metody georadarowej do identyfikacji stref erozji dna rzecznego na przykładzie wybranego odcinka doliny Wisły w Warszawie

Mieszkowski R., Wójcik E., Żmudzin D., Szwarc A., Sosnowska A., Popielski P.

Przegląd Geologiczny

2017

Vol. 65, nr 10/2

785--789

In the article the occurrence ofseveral natural thresholds in Vistula River valley was discussed. These forms are stabilizing river channel regime and impeding shipping at the same time. The example of application of ground penetrating radar (GPR) for detecting and identifying the erosion zones in the bottom of the river valley was presented. The investigations were carried out along the chosen section of Vistula River in the vicinity of Gdansk Bridge (Most Gdański) in Warsaw. The survey was conductedfrom a motorboat with the MALA GroundExplorer (GX) georadar system installed with 160 MHz screen antenna. The prospection down to 7.5 m below the water surface was obtained. The applied methodology allowed to obtain radar echograms indicating the following anomalies: from the river bottom, from cohesive soil (includingNeogene clays) andfrom thresholds (noticeably elevatedforms in the bottom). In identifying and interpreting georadar anomalies, archival boreholes data were used.

Ocena możliwości zastosowania metody georadarowej i elektrooporowej do identyfikacji rozluźnionych stref gruntów niespoistych

Mieszkowski R., Zawrzykraj P., Żmudzin D., Wójcik E., Popielski P.

Przegląd Geologiczny

2017

Vol. 65, nr 10/2

779--784

The results of the possibility of geophysical methods application (such as geoelectrical ones, including ground penetrating radar and electrical resistivity tomography) to identify areas of loose sands were presented in the article. Registered anomalies obtained from geophysical survey have been verified by geological and engineering tests (drillings and dynamic probing). Measurements were carried out along the part of the lateral earth dam, consisting of man-made soils with a thickness of approximately 7 m and underlying alluvial medium grained sands. The results obtained from the geophysical survey and direct assessment of density by means of dynamic probing allowed to demonstrate the relationship between a specific type of geophysical anomalies and the density of non-cohesive man-made soils.