Change search
ReferencesLink to record
Permanent link

Direct link
Sänkta sjöars inverkan på ytvatten i Västerbottens kustland: Samband mellan sänkningsnivåer och vattenkemi i sjöar på sulfidrika sedimentjordar
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
2012 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Impact of lake lowering in surface water within Västerbotten county : Correlation between lowering and water chemistry in lakes surrounded by sulphide-rich sediments (English)
Abstract [en]

Lake lowering in sulphide-rich areas is currently a major environmental impact for surface water. This study focuses on whether there is a relationship between a gradient of lake lowering and surface water impacts in areas of sulphide-rich sediments, in order to better understand their contribution of heavy metals and sulfuric acid. Also, is it a reasonable method to use the reduced lake area in order to quantify the gradient? The survey was conducted by collecting water samples from reference lakes and lowered lakes from south to north in coastal areas within the county of Västerbotten. Water samples were then analyzed for TOC, pH, conductivity, anions, base cations, alkalinity, acidity, sulfate, Al, Cd, Fe, Mn, Cu, Zn and Pb. These parameters were then compared statistically using regression analysis and t-tests. The results show that no gradient was discernible in response to the reduced lake area. However, significant differences (p < 0,05) between the reference lakes and all the reduced lakes were visible for pH, conductivity, Cd, Cu, Zn and Al. The study shows that there is a correlation between lake lowering and negative impacts on surface water. However, to calculate a gradient from the reduced lake area is deficient as it is limited by the lakes volume reduction, and how the area around the lake has been affected. Further studies on the subject are therefore necessary.

Place, publisher, year, edition, pages
2012. , 16 p.
Keyword [en]
Lake lowering, Gradient, Sulphide sediments, Acid sulfate soil, Water chemistry
National Category
Natural Sciences Earth and Related Environmental Sciences
URN: urn:nbn:se:umu:diva-62140OAI: diva2:575429
External cooperation
Länsstyrelsen Västerbotten
Subject / course
Examensarbete i Naturgeografi för kandidatexamen
Educational program
Bachelor of Science in Biology and Earthscience
Life Earth Science
FLISIK (för livskraftiga småvatten i kvarkenregionen)
Available from: 2012-12-10 Created: 2012-12-10 Last updated: 2012-12-10Bibliographically approved

Open Access in DiVA

Avenius_2012(4360 kB)137 downloads
File information
File name FULLTEXT01.pdfFile size 4360 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Department of Ecology and Environmental Sciences
Natural SciencesEarth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 137 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 166 hits
ReferencesLink to record
Permanent link

Direct link