Long-Term Groundwater Regime Trends in the Agricultural Areas

Rudzianskaitė, Aurelija

doi:10.15544/rd.2017.107

Cited by 1 publication

(2 citation statements)

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“…However, such karst features are mentioned only in this one publication out of all of the Web of Science Core Collection database. A similar term, 'peat-filled sinkhole', was mentioned in two conference proceedings papers by scientists from Lithuania (Rudzianskaitė, 2013a(Rudzianskaitė, , 2013b, where sinkholes have developed in geological settings similar to those in Latvia.…”

Section: Introductionmentioning

confidence: 94%

“…Although the Baltic states are not typically considered classic active karst localities, there are active karst regions (Levins & Buzajevs, 1999). Several studies in the area have focused on surface water and groundwater interactions (Delina et al, 2012;Morkunas et al, 2005;Rudzianskaitė, 2013aRudzianskaitė, , 2013b or on the sinkhole distribution in these regions (Paukstys & Narbutas, 1996;Satkunas et al, 2006), and to our knowledge, none have investigated the possible sinkhole distribution or sinkhole formation under peatlands. As karst landforms in the Baltic states develop mainly in lowlands with a relatively thin cover of Quaternary sediments, they can be masked by the infilling of Holocene sediments-particularly peat.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of buried karst sinkholes under a bog using ground penetrating radar (GPR) and electrical resistivity tomography (ERT)

Džeriņš

Karušs

Lamsters

et al. 2023

Earth Surf Processes Landf

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Active evaporite karst processes in the Baltic states are associated with a few relatively small regions where gypsum rocks can be found close to the Earth's surface. One of these areas lies in the vicinity of the Pandu bog. However, such a possibly active karst region, which is covered by peat and in which the mapping of karst formations is complex, has not been previously investigated. In this study, we present a buried and peat‐filled karst cover‐collapse sinkhole mapping approach that involves a combination of ground‐penetrating radar (GPR), electrical resistivity tomography (ERT) and conventional boreholes. A detailed map of the bog's substratum topography was constructed from a geophysical surveying dataset. It reveals 15 distinctly expressed sinkholes with diameters of several tens of metres. Overall, 140 potential sinkholes were also mapped using remote sensing data in the vicinity of the bog. Higher electrical resistivity anomalies were identified inside the peat; they coincide with scatter‐free zones in GPR data and water layers in boreholes. Highly disturbed internal peat layering was also detected in these sinkholes. It is suggested that these water layers and disturbed peat layering may have formed due to the subsidence of the lower peat layers, and thus they represent relatively younger sinkholes. This is also supported by evidence from orthophoto maps, which showed the formation and disappearance of surficial lakes and depressions on the bog surface. Our results revealed the presence of active and widespread karst processes under the bog that have not been previously noticed despite the fact that they have implications for the assessment of geohazards in this area.

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Section: Introductionmentioning

confidence: 94%