Sänkta sjöars inverkan på ytvatten i Västerbottens kustland: Samband mellan sänkningsnivåer och vattenkemi i sjöar på sulfidrika sedimentjordar
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)
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.
Lake lowering, Gradient, Sulphide sediments, Acid sulfate soil, Water chemistry
Natural Sciences Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:umu:diva-62140OAI: oai:DiVA.org:umu-62140DiVA: diva2:575429
Subject / course
Examensarbete i Naturgeografi för kandidatexamen
Bachelor of Science in Biology and Earthscience
UppsokLife Earth Science
Andersson, TordSundqvist, Mattias
ProjectsFLISIK (för livskraftiga småvatten i kvarkenregionen)