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Iskalni niz: "avtor" (Marjana Zajc) .

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Geophysical investigations in the Radovna River Spring area (Julian Alps, NW Slovenia)
Anja Torkar, Marjana Zajc, Jure Atanackov, Andrej Gosar, Mihael Brenčič, 2021, izvirni znanstveni članek

Povzetek: The Radovna River Valley is located in the north-western part of Slovenia in the Julian Alps, where there is an extensive intergranular aquifer whose depth to pre-Quaternary bedrock is unknown. Therefore, to obtain information about the depth of the valley and the geometry of the aquif er two geophysical methods were used in our study; ground penetrating radar (GPR) and seismic reflection method. The low-frequency GPR method has shown to be useful for determining the depth of the groundwater and the predominant groundwater recharge. Also, the high-resolution seismic method provided an insight about the morphology of the pre-Quaternary basement with the deepest point at 141 meters below surface. Measurements of hydrogeological parameters such as groundwater level and river discharge measurements were carried out in the study area. Both data analyses showed that groundwater level and river discharge are highly fluctuatingand rapidly changing, indicating a well-permeable aquifer, implying that such an aquifer is extremely sensitive and vulnerable to extreme climate events. Both the geophysical methods and the hydrogeological information have provided important information about the morphology of the valley and the alluvial aquifer, as well as increasing the knowledge about the Radovna springs system, which will contribute very important information for future hydrogeological studies.
Ključne besede: Ground penetrating radar, Seismic reflection method, Radovna spring, hydrogeology, aquifer geometry, glacial valley, groundwater table
Objavljeno v DiRROS: 09.03.2022; Ogledov: 214; Prenosov: 87
.pdf Celotno besedilo (6,27 MB)

GPR survey to reveal a possible tectonic tilt of the Brežice Sava River Terrace in the Krško Basin
Marjana Zajc, Marijan Poljak, Andrej Gosar, 2021, izvirni znanstveni članek

Povzetek: It has been supposed that the Brežice Sava River Terrace (BSRT) is tectonically disturbed near the town of Brežice and tilted to the north. To confirm this tectonically induced tilt in a quantitative sense, low-frequency Ground Penetration Radar (GPR) was applied. A total of eight GPR profiles were recorded across the BSRT providing information of the lower boundary of the terrace, which consists of loose to poorly cemented Quaternary gravel, while its Tertiary basement consists of poorly cemented carbonaceous silt (marl). The premise of the study was the assumption that this lithological boundary could be detected by the GPR method. In addition to the upper surface of the BSRT being tilted to the north by 0.18°, GPR profiles also showed a 0.04° difference in the tilt between the upper surface of the terrace and its lower boundary with the basement, which we assigned to the sin-sedimentary tilt. Upon this information, a cumulative tectonically induced dip of the BSRT lower boundary was defined at 0.22°.
Ključne besede: Brežice Sava River terrace, Krško basin, ground penetrating radar, tectonic tilt, seismic reflection profiling
Objavljeno v DiRROS: 06.01.2021; Ogledov: 892; Prenosov: 361
.pdf Celotno besedilo (4,88 MB)

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