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Consequences of changed wetness on riverine nitrogen - human impact on retention vs. natural climatic variability
SMHI, Samhälle och säkerhet.ORCID-id: 0000-0001-7490-7949
SMHI, Forskningsavdelningen, Hydrologi.ORCID-id: 0000-0001-8314-0735
2001 (engelsk)Inngår i: Regional Environmental Change, ISSN 1436-3798, E-ISSN 1436-378X, Vol. 2, nr 3, s. 93-105Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The HBV-N model was used for a scenario analysis of changes in nitrogen retention and transport caused by alterations of wetness due to land drainage, lowering of lakes, building of dams and climatic variability in a river basin in south-central Sweden (1885-1994). In general, dams were situated in locations more favourable for retention, compared to the lowered lakes. Rather modest conversions of water bodies only changed nitrogen transport by about 3%. The 180-times-larger increase of (mainly) tile-drained agricultural land had, according to simulations, increased the nitrogen transport by 17%, due to reduced retention. However, compared to human-induced alteration of the landscape N retention, the choice of 10-year periods of climatological data had the overriding effect on the calculated nitrogen transport. Weather-induced variations resulted in a 13% difference in nitrogen retention between various 10-year periods. When the model was driven by climatological data from the driest 10-year period (1905-1914), the estimated average annual load was only half of that obtained with climatological data from the wettest 10-year period (1975-1984).

sted, utgiver, år, opplag, sider
2001. Vol. 2, nr 3, s. 93-105
Emneord [en]
River basin modelling, Nitrogen, Historical, Retention, Climate, Sweden
HSV kategori
Forskningsprogram
Hydrologi
Identifikatorer
URN: urn:nbn:se:smhi:diva-1466DOI: 10.1007/s101130100024ISI: 000208298400001OAI: oai:DiVA.org:smhi-1466DiVA, id: diva2:849757
Tilgjengelig fra: 2015-08-31 Laget: 2015-08-17 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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