Modelling of water circulation and the dynamics of phytoplankton for the analysis of eutrophication

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Inkala, Arto 2012-02-13T12:27:32Z 2012-02-13T12:27:32Z 2001-10-26
dc.identifier.isbn 951-22-5686-X
dc.identifier.issn 0782-2030
dc.description.abstract The eutrophication and algal blooms are problems in many Finnish lakes and sea areas. One possible way to approach the problem is mathematical modelling. If the most important processes have been successfully modelled, it is easy to calculate the effects of nutrient load changes. This thesis presents experiences on developing and applying eutrophication models. The pre-calculated flow fields are the most important input to the water quality model, so the applications of the flow model are examined in two papers. The results indicate that the flow model can produce typical flows caused by wind. The simulations of the timing of upwelling were also successful. The excessive vertical diffusion can cause problems in eutrophication model applications. The results of simulations indicate that the greenhouse effect will advance and enlarge the spring bloom of phytoplankton. However, the average phytoplankton biomass in the Gulf of Finland will be near current level, defined in these scenarios by the available amount of nutrients almost unchanged due to the insignificant changes in the external nutrient inputs. The more significant nutrient load reductions from the major loading points have a clearly decreasing effect on the total algal biomasses even in one year long simulations. When the nitrogen fixing cyanobacteria was taken into account in the simulation, the results indicated that the phosphorus removal from St. Petersburg would decrease both average cyanobacteria and other algae biomasses. The biomass of other algae might increase in the zone where additional nitrogen is transported from the east. The Finnish national agenda, which is nitrogen dominated, does not seem to be an effective way to fight against accumulations of cyanobacteria. However, the total phytoplankton biomass will decrease near the Finnish coast. en
dc.format.extent 14, [81]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Research reports / Helsinki University of Technology, Systems Analysis Laboratory. A en
dc.relation.ispartofseries 82 en
dc.relation.haspart Inkala A., Myrberg K. 2001 Comparison of hydrodynamical models of the Gulf of Finland in 1995 - a case study, Systems Analysis Laboratory Research Reports E9, September 2001, Helsinki University of Technology, (submitted also to Environmental Modelling & Software). [article1.pdf] © 2001 by authors.
dc.relation.haspart Inkala A., Kuusisto M., Sarkkula J., Koponen J. 1999, Currents and transport of sewage water in the coastal area of Vaasa, Northern Baltic Sea - a study with current measurements and modelling, Proceedings of the 3rd International Marine Environmental Modelling Seminar '99, 12-14.4.1999, Lillehammer, Norway. [article2.pdf] © 1999 SINTEF. By permission.
dc.relation.haspart Inkala A., Hellsten S., Heikkinen M. 1998, Integrated 3D Modelling of Water Circulation and the Dynamics of Phytoplankton; the Effects of New Reservoir, Internat. Rev. Hydrobiol. 83:681-688. [article3.pdf] © 1998 Wiley-VCH Verlag Berlin GmbH. By permission. Wiley InterScience
dc.relation.haspart Inkala A., Bilaletdin Ä., Podsetchine V., 1997, Modelling the effect of climate change on nutrient loading, temperature regime, and algal biomass in the Gulf of Finland, Boreal Environment Research 2:287-301. [article4.pdf] © 1997 Boreal Environment Research. By permission.
dc.relation.haspart Inkala A., Pitkänen H. 1999, The effect of load reductions on algal biomass in the eastern Gulf of Finland - modelling point of view, Boreal Environment Research 4:357-366. [article5.pdf] © 1999 Boreal Environment Research. By permission.
dc.relation.haspart Kiirikki M., Inkala A., Kuosa H., Pitkänen H., Kuusisto M., Sarkkula J. 2001, Evaluating the effects of nutrient load reductions on the biomass of toxic nitrogen-fixing cyanobacteria in the Gulf of Finland, Boreal Environment Research 6:131-146. [article6.pdf] © 2001 Boreal Environment Research. By permission.
dc.subject.other Environmental science en
dc.title Modelling of water circulation and the dynamics of phytoplankton for the analysis of eutrophication en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Engineering Physics and Mathematics en
dc.contributor.department Teknillisen fysiikan ja matematiikan osasto fi
dc.subject.keyword phytoplankton dynamics en
dc.subject.keyword hydrodynamics en
dc.subject.keyword load reductions en
dc.subject.keyword eutrophication en
dc.subject.keyword nutrients en
dc.subject.keyword Gulf of Finland en
dc.identifier.urn urn:nbn:fi:tkk-002963
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Systems Analysis Laboratory en
dc.contributor.lab Systeemianalyysin laboratorio fi

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