The Gdańsk hydrogeological system consists of three main aquifers: Cretaceous, Paleogene-Neogene and Pleistocene. Chemical composition of groundwater varies between water-bearing beds, although water from Pleistocene and Paleogene-Neogene aquifers shows much similarities. The dominant hydrochemical groundwater types is HCO3-Ca. This type is characteristic for Pleistocene deposits in the Kashubian Lake District where natural chemical composition is preserved and also for Paleogene-Neogene aquifer. Groundwater from Cretaceous deposits in part of the region is also HCO3-Ca but the dominant type seems to be HCO3-Na. An increased amount of chlorine ion causes change of type into Cl-HCO3-Na or Cl-Na in some places. A specific component occurring in water from Cretaceous aquifer is fluoride ion. Pleistocene aquifer in the discharge zone is often changed due to antropopression and the type HCO3-SO4-Ca and HCO3-SO4-Cl-Ca appears there. The main reason for the changes is connected with the processes provoked by uneven and intensive exploitation and also with salt water intrusion. In some places contamination from the surface appears. As a result an increased amount of sulphates, chlorides, ammonia nitrogen and sometimes nitrate nitrogen is observed.
Authors
Additional information
- Category
- Publikacja monograficzna
- Type
- rozdział, artykuł w książce - dziele zbiorowym /podręczniku w języku o zasięgu międzynarodowym
- Language
- angielski
- Publication year
- 2011
Source: MOSTWiedzy.pl - publication "Groundwater Quality in the Gdansk Aquifer System" link open in new tab
