A groundwater flow model for the Wolin Island area, including glaciotectonic deformation
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Date
2018-12
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Publisher
Instytut Geologii UAM
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Abstract
During the construction of mathematical models for mapping hydrogeological conditions it is necessary to apply sim-
plifications, both in the geological structure and in hydrogeological parameters used. The present note discusses prob-
lems 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 geologi-
cal 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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Keywords
GIS, groundwater modeling, groundwater exploitation, coastal hydrogeology, southern Baltic Sea coast
Citation
Geologos, 2018, 24, 3, s.207-216
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ISBN
978-83-232187-4-6
ISSN
1426-8981