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| Journal Article | FZJ-2026-01434 |
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2025
Bundesanst. für Gewässerkunde, BfG
Koblenz
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Please use a persistent id in citations: doi:10.5675/HYWA_2025.5_1 doi:10.5675/HyWa_2025.5_1 doi:10.34734/FZJ-2026-01434
Abstract: Nutrients are discharged into surface waters and groundwater via runoff components. As part of the Germany-wide RELAS project, the runoff components total runoff, surface runoff, drainage runoff, natural interflow, direct runoff from urban areas and groundwater recharge were modelled with the water balance model mGROWA for the period 1991 to 2020 at a spatial resolution of 100 m x 100 m. The regional interaction of climate and topography, but also of soil, geology and land use, results in total runoff ranging from less than 100 mm/a in the Leipzig lowland bay to more than 1,200 mm/a in the Alps. In all solid rock regions, natural interflow dominates direct runoff. Runoff from drainage systems is widespread in locations influenced by groundwater or waterlogging in unconsolidated rock regions, such as the North German lowlands. At sites remote from groundwater in flat unconsolidated rock regions, total runoff is classified as groundwater recharge in the model. The modelled runoff in daily resolution was aggregated to mean long-term values and then evaluated for plausibility by comparing it with the observed runoff from more than 1,100 gauging stations in river basins. The results indicated a very good agreement nationwide across all catchments. The model results thus provide a reliable basis for modelling pathway-specific nutrient inputs.
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