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dc.contributor.authorHindar, A.nb_NO
dc.contributor.authorBjerkeng, B.nb_NO
dc.contributor.authorTjomsland, T.nb_NO
dc.contributor.authorJohnsen, T.nb_NO
dc.contributor.otherHindar, A. - Project managernb_NO
dc.coverage.spatialAust-Agdernb_NO
dc.date.accessioned2014-08-01T10:51:30Z
dc.date.available2014-08-01T10:51:30Z
dc.date.issued2007nb_NO
dc.identifier5470nb_NO
dc.identifier.isbn978-82-577-5205-7nb_NO
dc.identifier.issn1894-7948nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/213771
dc.descriptionÅrsliste 2007nb_NO
dc.description.abstractThe new road, E18, between Grimstad and Kristiansand in Aust-Agder county, will be constructed by blasting of about 15.9 mill. tons (7.7 mill m3) of rock. This will be carried out by use of 0.65 or 2.5 kg explosives per m3 rock for earth works and tunnel works, respectively, and potentially (if 100 % leaching) result in runoff of 900 tons of nitrogen. Potentially about 500 tons of N will enter the more or less landlocked fjords Kaldvellfjorden, Vallesverdfjorden and Isefjærfjorden. We have compared this loading with background and other man-made N-loads by use of the river transport model TEOTIL. Further, we calibrated and run the NIVA fjord model to estimate the change in concentrations of nitrogen, particulate matter and the oxygen regime in these three fjords. Nitrate concentrations are estimated to potentially increase by a factor of 2 for 2 years at most. The results are discussed on basis of relative increase in nitrate and the impact on algae growth and composition. Due to the dilution by sea water, the general phoshorus limitation in the fjords and grazing by zooplankton, biological effects and effects on the oxygen regime in the fjords are estimated to be minor. If we also assume that the actual N-leaching will be far less than the potential, we are relatively certain that the effects will be insignificant.nb_NO
dc.description.sponsorshipCJV E18 Grimstad-Kristiansandnb_NO
dc.publisherNorsk institutt for vannforskningnb_NO
dc.relation.ispartofseriesNIVA-rapport;5470nb_NO
dc.rightsNavngivelse-IkkeKommersiell-DelPåSammeVilkår 3.0 Norgenb_NO
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/no/nb_NO
dc.subjectmiljøgifter og forsuringnb_NO
dc.titleCritical loads for nitrogen in fjords; evaluation of effects of niotrogen leaching from explosives used for E18 road construction i Aust-Agdernb_NO
dc.typeResearch reportnb_NO
dc.rights.holderNorsk institutt for vannforskning/Norwegian institute for water researchnb_NO
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400nb_NO
dc.source.pagenumber38nb_NO
dc.subject.keywordvegarbeidnb_NO
dc.subject.keywordfjordernb_NO
dc.subject.keywordnitrogennb_NO
dc.subject.keywordkritisk belastningnb_NO
dc.subject.keywordroad constructionnb_NO
dc.subject.keywordfjordsnb_NO
dc.subject.keywordnotrogennb_NO
dc.subject.keywordcritical loadnb_NO
dc.relation.projectO-27171nb_NO


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