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Source apportionment of riverine nitrogen transport based on catchment modelling
SMHI, Research Department.
SMHI, Research Department, Hydrology.ORCID iD: 0000-0001-8314-0735
1996 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 33, no 4-5, 109-115 p.Article in journal (Refereed) Published
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Text
Abstract [en]

Source apportionment of river substance transport, i.e. estimation of how much each source in each subbasin contributes to the river-mouth transport is a vital step in achieving the most efficient management practices to reduce pollutant loads to the sea. In this study, the spatially lumped (at sub-catchment level), semiempirical PULSE hydrological model, with a nitrogen routine coupled to if was used to perform source apportionment of nitrogen transport in the Soderkopingsan river basin (882 km(2)) in south-eastern Sweden, for the period 1991-93. The river basin was divided into 28 subbasins and the following sources were considered: land leakage from the categories forest arable and ley/pasture; point sources, and; atmospheric deposition on lake surfaces. The calibrated model yielded an explained variance of 60%, based on comparison of measured and modelled river nitrogen (Total N) concentrations. Eight subbasins, with net contributions to the river-mouth transport exceeding 3 kg ha(-1) yr(-1), were identified as the most promising candidates for cost efficient nitrogen management. The other 20 subbasins all had net contributions below 3 kg ha(-1) yr(-1). Arable land contributed 63% of the nitrogen transport at the river mouth and would thus be in focus for management measures. However, point sources (18% contribution to net transport) should also be considered due to their relatively high accessibility for removal measures (high concentrations). E.g., the most downstream subbasin, with the largest wastewater treatment plant in the whole river basin, had a net contribution of 16 kg ha(-1) yr(-1). This method for source apportionment may provide authorities with quantitative information about where in a river basin, and at which sources, they should focus their attention. However, once this is done, an analysis with higher resolution has to be performed in each of the interesting subbasins, before decisions on actual management measures can be taken. Copyright (C) 1996 IAWQ.

Place, publisher, year, edition, pages
LINKOPING UNIV,DEPT WATER & ENVIRONM STUDIES,S-58183 LINKOPING,SWEDEN., 1996. Vol. 33, no 4-5, 109-115 p.
Keyword [en]
nitrogen modelling, nitrogen transport, river basin, source apportionment, source distribution
National Category
Oceanography, Hydrology, Water Resources
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:smhi:diva-1646DOI: 10.1016/0273-1223(96)00220-XISI: A1996UW04900016OAI: oai:DiVA.org:smhi-1646DiVA: diva2:897723
Conference
2nd International IAWQ Specialized Conference and Symposia on Diffuse Pollution, AUG 13-18, 1995, BRNO, CZECH REPUBLIC
Available from: 2016-01-26 Created: 2015-12-22 Last updated: 2016-03-31Bibliographically approved

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