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| Titel |
Numerical model for mapping of complex hydrogeological conditions: the Chmielnik area (South Poland) case study |
| VerfasserIn |
Kamila Buszta, Tadeusz Szklarczyk, Grzegorz Malina |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141916
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| Publikation (Nr.) |
 EGU/EGU2017-5473.pdf |
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| Zusammenfassung |
| Detailed analysis of hydrogeological conditions at a study area is the basis for characterising
adjacent groundwater circulation systems. It is also an essential element during executing
hydrogeological documentations.
The goal of this work was to reconstruct on a numerical model natural groundwater
circulation systems of the studied area located within the municipality of Chmielnik
in the region of Kielce (South Poland). The area is characterized by a complex
geological structure, which along with the existing hydrographic network, makes the
scheme of groundwater circulation complicated and difficult to map on a numerical
model.
The studied area is situated at the border of three geological units: on the North - the
extended portion of the Palaeozoic Swietokrzyskie Mountains (mainly Devonian and
Permian), in the center - the S-W part of the Mesozoic Margin of the Swietokrzyskie
Mountains, and on the South – a marginal zone of the Carpathian Foredeep. The whole area
belongs to the Vistula river basin, and it includes catchments of its left tributaries: the Nida
and Czarna Staszowska rivers.
Based on the collected field and archival hydrogeological, hydrological and sozological
data a conceptual model was built, under which a numerical model of groundwater flow was
developed using the specialized software - Visual MODFLOW. The numerical model maps
the five-layer groundwater circulation system in conjunction with surface watercourses. Such
division reflects appropriately the variability of hydrogeological parameters within the
geological structures. Two principal and exploited aquifers comprise: a fractured-porous
Neogene and fractured Upper Jurassic formations. The external model borders are based
primarily on surface watercourses and locally on watersheds. The modelled area of 130 km2
was divided into square grids of 50 m. The model consists of 275 rows and 277 columns.
Each of five layers was simulated with the same number of active blocks. In the construction
of the model boundary conditions of type: I, II and III were established. Data from
of 36 groundwater observation points (hydrogeological boreholes and dug wells)
measured in September 2015 were used to calibrate the model. The correlation
coefficient of the model is 0,998. Two variants were simulated on the model: natural
conditions (without water abstraction) and with groundwater exploitation (September
2015).
The carried out analysis of hydrogeological conditions and developed numerical model
will be the basis for assessing the impact of a drainage of an open limestone pit mine realized
in this area on the soil-water system and for designing a sustainable distribution system of
mine waters to protect groundwater depending ecosystems.
This study is financially supported by AGH research grant no. 15.11.140.828. |
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