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| Titel |
A method to assess instream water quality – the role of nitrogen entries in a North German rural lowland catchment |
| VerfasserIn |
B. Schmalz, K. Bieger, N. Fohrer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Advances and visions in large-scale hydrological modelling ; Nr. 18 (2008-06-20), S.37-41 |
| Datensatznummer |
250013860
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| Publikation (Nr.) |
 copernicus.org/adgeo-18-37-2008.pdf |
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| Zusammenfassung |
The objective of this study was the detection and assessment of nutrient
entry pathways in a complex mesoscale lowland catchment. The central aim was
the development of a transferable method for an efficient estimation of
instream water quality in rural environments. The investigated Kielstau
catchment with a size of approximately 50 km2 is located in the North
German lowlands. Land use is dominated by agriculture as well as pasture and
is characterised by extensive artificial drainage systems. Additionally
wastewater treatment plants influence the river water quality.
Six measuring campaigns were carried out over the period of one year. Each
time, water quality was assessed at 16 locations along a 12 km longitudinal
transect of the stream to consider the influence of each tributary or
inflow. The results showed that the applied measuring method was useful to
assess nutrient entry pathways into surface waters from diffuse and point
sources. Some tributaries increased the main stream NO3-N
concentrations especially in autumn. Using a German classification system
(LAWA, 1998), the NO3-N results can mostly be assigned to water quality
class III (heavily contaminated). Water balance and nitrate loads were
modelled with the river basin scale model SWAT (Soil and Water Assessment
Tool, Arnold et al., 1998). The measured and modelled discharges showed a
good correlation. While nitrate load range and dynamics are well represented
during the summer periods, they show a poor correlation during the winter
period. |
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