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Advances in Geosciences An open-access journal for refereed proceedings and special publications
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Volume 27 | Copyright
Adv. Geosci., 27, 145-148, 2010
https://doi.org/10.5194/adgeo-27-145-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  09 Dec 2010

09 Dec 2010

Modelling of long term nitrogen retention in surface waters

S. Halbfaß, M. Gebel, and S. Bürger S. Halbfaß et al.
  • Gesellschaft für Angewandte Landschaftsforschung (GALF) bR, Dresden, Germany

Abstract. In order to derive measures to reduce nutrient loadings into waters in Saxony, we calculated nitrogen inputs with the model STOFFBILANZ on the regional scale. Thereby we have to compare our modelling results to measured loadings at the river basin outlets, considering long term nutrient retention in surface waters. The most important mechanism of nitrogen retention is the denitrification in the contact zone of water and sediment, being controlled by hydraulic and micro-biological processes. Retention capacity is derived on the basis of the nutrient spiralling concept, using water residence time (hydraulic aspect) and time-specific N-uptake by microorganisms (biological aspect). Short time related processes of mobilization and immobilization are neglected, because they are of minor importance for the derivation of measures on the regional scale.

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