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A groundwater flow model for the Wolin Island area, including glaciotectonic deformation

Hoc R., Sadurski A., Wiśniowski Z.

Geologos

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2018

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Vol. 24, No. 3

207--216

EN

During the construction of mathematical models for mapping hydrogeological conditions it is necessary to apply simplifications, both in the geological structure and in hydrogeological parameters used. The present note discusses problems surrounding the mapping of glaciotectonic disturbances that occur in the northern part of Wolin Island (northwest Poland). For this part of the island, a direct outflow of groundwater towards the Baltic Sea basin has been determined on the basis of geophysical survey results. An important feature in the hydrogeological conditions here is the isolation of groundwater from both the Baltic Sea and Szczecin Lagoon by clay with a Cretaceous xenolith. Such a geological structure explains the presence of perched water at considerable heights in zones close to the cliffs, without any significant hydraulic connection with surrounding reservoirs. Hydrogeological conditions of Wolin Island have been modelled using the Visual MODFLOW package v.4.2. In the vertical section, these conditions can be simplified to one aquifer (Pleistocene-Holocene), in which two aquifers can be distinguished. In a large part of the island, these remain in mutual hydraulic contact: layer I – upper, with an unconfined aquifer, and layer II – lower, with a confined aquifer, locally an unconfined one. The schematisation of hydrogeological conditions adopted here has allowed to reproduce present groundwater dynamics in the study area.

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Badania hydrogeologiczne wybrzeża Bałtyku Południowego

Burzyński K., Sadurski A.

Przegląd Geologiczny

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2015

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Vol. 63, nr 10/1

622--627

EN

The coastal area of the Southern Baltic is the limit of two different hydrogeochemical environments – fresh and brackish water of sea intrusion and salt ascending water from deep Mesozoic strata. Recognition of these waters occurrence and their origin started about hundred years ago in the Gdańsk region. The Vistula delta plane was the first area of the detailed studies. At that time two sources of the salt waters have been stated – salt water ascension from the Mesozoic strata in the central part of the delta and remaining sea water from the early stages of the delta evolution. The last mentioned belongs to the young relic sea water from the Littorina time. More detailed investigations along the polish Baltic coast has been started in 70. of XX century. The new investigation methods were implemented during last 40 years, especially geoelectrical logging, remote sensing, isotopic and chemical composition examination of water samples, noble gas dissolved in groundwater. The numerical simulation models has been applied and also groundwater chemical modeling is adopted in hydrogeological practice.

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Procesy ingresji i ascenzji wód na polskim wybrzeżu bałtyckim

Burzyński K., Kozerski B., Sadurski A.

Biuletyn Państwowego Instytutu Geologicznego

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1999

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nr 388 Hydrogeologia

35-48

PL

Słone lub słonawe wody podziemne występują w wielu miejscach wzdłuż polskiego wybrzeża Bałtyku w następstwie ingresji wód morskich wywołanej nadmierną eksploatacją lub ascenzją solanek z warstw mezozoiku. Wyniki badań hydrogeochemicznych, geofizycznych i modelowania filtracji prowadzonych na przestrzeni ostatnich 10 lat pozwoliły wyjaśnić ich zróżnicowane pochodzenie oraz czas przebywania w warstwach wodonośnych wybrzeża. Zróżnicowanie gęstości wód, ciśnień piezometrycznych i zasilania warstw wodami infiltracyjnymi to główne czynniki powodujące przepływ wód słonych na wybrzeżu. Wyróżniono trzy typy jednostek hydrogeologicznych wybrzeża oraz opisano matematyczne modele równowagi wód słonych i słodkich (zwykłych). Główną zasadą w ochronie zasobów wód podziemnych wybrzeża jest ograniczenie wielkości poboru wód przez ujęcia do bezpiecznej, gwarantowanej wydajności, która sprowadza się do poprawnego wyznaczenia zasobów eksploatacyjnych.

EN

Brackish or salt groundwaters occur in many places along the Polish Baltic coast as a results of intrusion due to overexploitation or ascension from Mesozoic strata. The results of hydrogeochemical, geophysical and modelling investigations carried out during the last ten years reveal different origin and residence time of water in the coastal aquifers. Differences in density of waters, piezometric heads and recharge by meteoric water are the main factors of the salinization of the groundwater along the coast. Three types of coastal hydrogeological units were established and mathematical models of salt water transport are quoted. Limitation of groundwater exploitation of the water intakes in this region according to the safe yield of water is the master point of groundwater resources protection.