Tracing groundwater recharge conditions based on environmental isotopes and noble gases, Lom depression, Bulgaria

Túri, Marianna; Molnár, Mihály; Orehova, Tatiana; Toteva, Aglaida; Hristov, Vladimir; Benderev, Aleksey; Horváth, Anikó; Palcsu, László

doi:10.1016/j.ejrh.2019.100611

Cited by 2 publications

(2 citation statements)

References 31 publications

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“…In this section, the top of the Upper Pontian aquifer is at a depth of approximately 100 m (Benderev et al, 2010). The isotope studies of Túri et al (2019) aim at examining the groundwater, which is formed in different climatic conditions and evaluating the residence time of the water in the aquifer (its age). The age determinations by 3 H/ 3 He proved that drilling waters near the village of Dolni Tsibar were between 9 6 00-11 6 00 years old and correspond to a large extent to the Late Pleistocene or the transition time between the two periods (Early Holocene -Late Pleistocene).…”

Section: Object Of Researchmentioning

confidence: 99%

Chemical composition of groundwater in the zone of slow water exchange of the Upper Pontian aquifer, Northwestern Bulgaria

Toteva

Shanov²

2021

Engineering Geology and Hydrogeology

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The Upper Pontian aquifer occupies the central part of the Lom Depression. The geological position determines its gradual dipping from the periphery to the central parts. It is one of the most water-abundant aquifers in Northwestern Bulgaria and is associated with the sands of the Archar Formation. The chemical composition of the waters is of interest and is important for the water supply in the area. The analysis of the data shows that there are regularities in the change of the water quality with aquifer depth. Significant differences in some of the hydrochemical parameters are found in the zone of slow water exchange and geological and hydrogeological explanations have been sought.

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Section: Object Of Researchmentioning

confidence: 99%

Chemical composition of groundwater in the zone of slow water exchange of the Upper Pontian aquifer, Northwestern Bulgaria

Toteva

Shanov²

2021

Engineering Geology and Hydrogeology

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“…For the gravels a hydraulic conductivity of up to 100-150 m/d was established and for the cover -0.4 m/d (Antonov et al, 1962). Groundwater is recharged by infiltration of precipitation, surface water (mostly Skomlya River) and groundwater, which laterally flows into the alluvium from the adjacent Upper-Pontian aquifer (Benderev et al, 2010;Túri et al, 2019). At high waters, the Danube River suppresses the formed groundwater flow and temporarily feeds it.…”

Section: R a F T C O P Ymentioning

confidence: 99%

Geological and geomorphological conditions of Archar-Orsoya lowland as a factor for the formation of groundwater chemical composition and in risk of its contamination

Kolev

Trayanova

2021

Engineering Geology and Hydrogeology

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The Archar-Orsoya lowland is situated in the Danube floodplain west of the town of Lom, NW Bulgaria. It is aligned in a west-east direction along the Danube River and to the south it is bounded by a high landslide slope, built of Pliocene clays and sands. Parallel to the shore, sand dunes are formed with lowered sections between them, in which there are conditions for swamping. The lowland is made up of the alluvial sediments of the Danube, represented by a lower gravelly-sandy layer and an upper sandy-clayey layer. In the gravelly-sandy layer unconfined groundwater is accumulated, with shallow water table – from 0.5 to 7 m beneath the surface. Groundwater is recharged by infiltration of precipitation, surface water and groundwater, which laterally flows into the alluvium from adjacent aquifers. At high waters, the Danube River suppresses the formed groundwater flow and temporarily feeds it. Due to the described formation conditions in the lowland, the chemical composition of groundwater is formed under the influence of intense dynamics and has a low TDS (total dissolved solids). The shallow groundwater table and the corresponding thin unsaturated zone are a prerequisite for easy groundwater contamination with components entering from the surface. Therefore, a map of depth to groundwater table is drawn to identify the most vulnerable areas.

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Tracing groundwater recharge conditions based on environmental isotopes and noble gases, Lom depression, Bulgaria

Cited by 2 publications

References 31 publications

Chemical composition of groundwater in the zone of slow water exchange of the Upper Pontian aquifer, Northwestern Bulgaria

Chemical composition of groundwater in the zone of slow water exchange of the Upper Pontian aquifer, Northwestern Bulgaria

Geological and geomorphological conditions of Archar-Orsoya lowland as a factor for the formation of groundwater chemical composition and in risk of its contamination

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