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dc.contributor.advisorLydersen, Espen
dc.contributor.advisorHeggenes, Jan
dc.contributor.authorDahal, Nitish
dc.coverage.spatialEvjudalenen_US
dc.coverage.spatialen_US
dc.date.accessioned2022-01-21T10:11:03Z
dc.date.available2022-01-21T10:11:03Z
dc.date.issued2020
dc.identifier.urihttps://hdl.handle.net/11250/2838651
dc.description.abstractThis investigation has emphasized on transport of particles and nutrients during different hydrological events in a water course in Southern Norway, primarily draining agricultural areas. Two streams, Borjaevju and Prestevju, enter artificial made retention dam system (Dam A, B and C) before leaving the dam through the Evjudalen stream. Thus, a major goal was to investigate the retention potential of nutrients, primarily phosphorous (P), in the artificial made dam system. The chemistry in the two streams was very different, with much higher electrolytic conductivity (concentrations of ions) and nutrients in the Prestevju stream compared with the Borjaevju stream. Anthropogenic influence like agriculture, settlement and sewage discharge may have large impacts on stream water chemistry including turbidity or TSS (Total suspended particles) and subsequent particle associated compounds as TP, heavy metals and organic micropollutants. TSS and turbidity were also strongly and positively correlated with TP in our study. Turbidity and TSS were also strongly positively correlated to water discharge, i.e. at highest during spring and autumn floods, but with significant chemical differences between the two seasonal flood episodes. Highest concentration of nutrients especially, nitrogen and phosphorus, were observed during spring flood, likely as a result of fertilizing of agricultural land at that time of the year. Despite significant higher turbidity/TSS peak values during the autumn flood, the Total-P was lower than during the spring flood, indicating lower P-particle load during autumn. Our calculations for retention of particles and particle associated nutrients in the artificial dams, showed retention of turbidity with subsequent retention of TN, TP, Tot-Fe at low to medium flow rates, i.e. up to ≈ 1000 L sec-1measured in the Evjudalen stream located about 200 m downstream from dam area outlet.en_US
dc.language.isoengen_US
dc.publisherUniversity of South-Eastern Norwayen_US
dc.titleVariations in macrochemistry, nutrients and heavy metals during hydrological events in a small Norwegian streamen_US
dc.typeMaster thesisen_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright The Authoren_US
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Limnologi: 498en_US


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