Digitala Vetenskapliga Arkivet

Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Undersökning av tidigt varningssystem för algblomning: -en studie genom vattenkvalitetsmätningar med EXO2 sond, fjärranalys och vattenprovtagning
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
2021 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Investigating early warning system for algal blooms : -a study by in situ measurement of water quality using the EXO2 probe, remote sensing and water sampling in Stora Ullfjärden, Håbo kommun (English)
Abstract [en]

Algal blooms can pose a serious threat to humans and animals in lakes used for drinking water and recreation in the bloom contains toxin producing cyanobacteria. Early warning of impending algal blooms requires systems with high temporal resolution. Cyanoalert from Brookman Geomatics is such a system that uses remote sensing satellites from the Eu Copernicus program to supervise amongst others chlorophyll in water systems.Measurements of chlorophyll are studied in this project to identify water quality parameters and conditions affecting the reliability. Biweekly sampling is conducted during the spring of 2021 obtaining chlorophyll data from profile measurements using water sampling a calibrated multiparameter probe. Water samples are then used as accurate reference for satellite measurement comparison.The water samples showed low levels of chlorophyll, turbidity, and pH in the beginning of the sampling in March. During the sampling period the levels rose until reaching a maximum during algae bloom in the end of May. The bloom was preceded by rising water temperatures and the formation of a thermocline and rising pH levels that could be used as suitable indicators for imminent bloom formation.Obtained data and governing effects were analyzed by multivariate regression (PLSR). VIP-plots showing that turbidity had the largest influence on the projected chlorophyll and thereby the measured chlorophyll levels. Also, Secci depth was identified as having strong influence. This indicates that high turbidity is a factor causing accuracy of chlorophyll measurements to deteriorate.A proposed warning system for algal blooms should use remote sensing satellites for detecting chlorophyll and turbidity combined with in situ sensors for the surveillance of water temperature, phycocyanin and pH.

Place, publisher, year, edition, pages
2021. , p. 38
Series
UPTEC W, ISSN 1401-5765 ; 21049
Keywords [sv]
fjärranalys, algblomning, cyanobakterier, varningssystem, multiparametersond
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:uu:diva-460165OAI: oai:DiVA.org:uu-460165DiVA, id: diva2:1616571
Educational program
Master Programme in Environmental and Water Engineering
Supervisors
Examiners
Available from: 2021-12-06 Created: 2021-12-03 Last updated: 2021-12-06Bibliographically approved

Open Access in DiVA

fulltext(1871 kB)393 downloads
File information
File name FULLTEXT01.pdfFile size 1871 kBChecksum SHA-512
ed6ac6f7785825313023875df85501b203fd3465a3b3b59b5ebfcb4abd39babb9e198fd7f951cdc2c233d3aed99c3f7eec4e81503e6c65e722ca732dca290951
Type fulltextMimetype application/pdf

By organisation
Limnology
Water Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 393 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

urn-nbn

Altmetric score

urn-nbn
Total: 244 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf