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Modelling denitrification at the catchment scale
- Source :
- Science of the Total Environment, Science of the Total Environment, Elsevier, 2009, 407 (5), pp.1726-1737. ⟨10.1016/j.scitotenv.2008.10.069⟩
- Publication Year :
- 2009
- Publisher :
- HAL CCSD, 2009.
-
Abstract
- The objective of this work was to evaluate the importance of heterotrophic denitrification in the fate of nitrogen surpluses at the catchment scale. For that purpose we modified the denitrification module of TNT2 model and calibrated the model on a small catchment where denitrification measurements had been performed in different locations. The main interest of the TNT2 model is its ability to simulate the dynamics of the zones where soil and shallow water table interact, making it possible to spatialize the denitrification process. Daily water and nitrogen flux at the outlet were relatively well simulated (Nash of 0.85 and 0.77). In average, the model correctly simulates the denitrification measurements (R = 0.68). Nitrogen flux towards the atmosphere, at the catchment scale (4.70 g N m(-2) year(-1)), is of the same order of magnitude as the soluble N flux in the stream. The model was able to reproduce the distribution of denitrification in the riparian (mean of 9.26 g N m(-2) year(-1)) and hillslope (mean of 3.45 g N m(-2) year(-1)) domains of the catchment. The results confirm the importance of riparian denitrification, but show also that hillslope soils contribute significantly (60%) to the whole catchment denitrification. The variations of denitrification rates, and also of nitrate concentrations in stream were not very well simulated by the model, highlighting the complexity of the spatial and temporal controls of nitrogen dynamics in areas with high inputs of nitrogen fertilizers, especially under organic forms. (C) 2008 Elsevier B.V. All rights reserved.
- Subjects :
- Environmental Engineering
Watershed
Denitrification
010504 meteorology & atmospheric sciences
Nitrogen
[SDV]Life Sciences [q-bio]
0207 environmental engineering
02 engineering and technology
01 natural sciences
modelling
cycle de l'azote
chemistry.chemical_compound
Nitrate
CATCHMENT
Water Movements
nitrogen cycle
Environmental Chemistry
TNT2
Computer Simulation
020701 environmental engineering
Nitrogen Compounds
Waste Management and Disposal
Nitrogen cycle
0105 earth and related environmental sciences
Riparian zone
watershed
modélisation
Hydrology
geography
geography.geographical_feature_category
HYDROLOGIE
Biogeochemistry
DENITRIFICATION
15. Life on land
Pollution
6. Clean water
bassin versant
chemistry
Models, Chemical
Soil water
Environmental science
Spatial variability
France
Water Pollutants, Chemical
Subjects
Details
- Language :
- English
- ISSN :
- 00489697 and 18791026
- Database :
- OpenAIRE
- Journal :
- Science of the Total Environment, Science of the Total Environment, Elsevier, 2009, 407 (5), pp.1726-1737. ⟨10.1016/j.scitotenv.2008.10.069⟩
- Accession number :
- edsair.doi.dedup.....300c7fb032bd3fcde27252e180475040