Abstract
A new version of the `Riverstrahler' model has been developed for modelling riverine transfers of nitrogen from diffuse sources within the watershed, using land use data as a forcing function, together with an adjustable riparian transfer coefficient. Application of the model to the Seine river system (divided into four main sub-basins and one main branch) allows to establish a comprehensive budget of nitrogen transfers through the whole drainage network and to quantify the overall retention by riparian wetlands. According to the sub-basins, the figures indicate that 25 – 55% of the nitrogen coming from below the root-zone of agricultural land or from the aquifers is retained or eliminated before reaching surface water. The lower retention is found in areas where dense agricultural draining has been installed, thus by-passing riparian wetlands. At the scale of the Seine catchment, riparian retention represents 70 – 110 103 tonN y-1, while in-stream retention accounts for only 24–32 103 tonN y-1. The data suggest that landscape management, like restoration of efficient riparian systems in areas where they have been suppressed or by-passed, might be an efficient alternative or complimentary strategy for reducing nitrate contamination of surface water, with respect to tertiary treatment of point wastewater discharges.
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Billen, G., Garnier, J. Nitrogen transfers through the Seine drainage network: a budget based on the application of the `Riverstrahler' model. Hydrobiologia 410, 139–150 (1999). https://doi.org/10.1023/A:1003838116725
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DOI: https://doi.org/10.1023/A:1003838116725