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Dernière mise à jour : Mai 2018

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UMR SAS has developed a set of models dedicated to nitrogen transfer and transformation in small catchments with shallow groundwater

UMR SAS has developed a set of models dedicated to nitrogen transfer and transformation in small catchments with shallow groundwater.

The initial aim of the project was to simulate the possibility for nitrate leached uphill to be catched by soil or vegetation downhill, where groundwater level reaches the soil. For this, we adapted a crop model, STICS , to couple it with a distributed hydrological model using some TOPMODEL asumptions  (from K. Beven and M.Kirkby), and based on the terrain analysis software MNTSurf.

Embarking a precise description of the agricultural catchment, the landscape structure, the distribution and specifics of agriculture management practices, this model has been further developed to simulate the role of ecological infrastructures (hedgerows, vegetated filterstrips, riparian buffers) on nitrogen retention. The hydrological part of the model is included in the nitrogen cascade model Nitroscape, together with another crop model (CERES-EGC) and an atmospheric model (OPS, then Fides-Surfatm).

TNT2 has also been coupled with the farm model MELODIE to form CASIMOD'N. This was done to improve the simulation of mixed farming areas (crop and livestock) and to be able to simulate changes in the production systems. Both models operate under INRA modeling plateform RECORD.

The application of TNT2 to areas with acute environmental issues (drinking water supply catchments, green algae areas...) required the development of pre-processing tools of available information, and particularly management practices. The CSAM software is designed to distribute crop rotations and successions of cropping operations on all the fields of a catchment using expert rules and constraints.

TNT2 is under GNU GPLv3 license. A partnership agreement allows the SCHEME company to use it and to participate to its development.

Selected publications:

Moreau, P., Ruiz, L., Vertès, F., Baratte, C., Delaby, L., Faverdin, P., Gascuel-Odoux, C., Piquemal, B., Ramat, E., Salmon-Monviola, J., 2013. CASIMOD’N: An agro-hydrological distributed model of catchment-scale nitrogen dynamics integrating farming system decisions. Agricultural Systems 118, 41-51. DOI: 10.1016/j.agsy.2013.02.007

Beaujouan, V., Durand, P., Ruiz, L., Aurousseau, P., Cotteret, G., 2002. A hydrological model dedicated to topography-based simulation of nitrogen transfer and transformation: rationale and application to the geomorphology-denitrification relationship. Hydrological Processes 16, 493-507. DOI: 10.1002/hyp.327

Duretz, S., Drouet, J.L., Durand, P., Hutchings, N.J., Theobald, M.R., Salmon-Monviola, J., Dragosits, U., Maury, O., Sutton, M.A., Cellier, P., 2011. NitroScape: A model to integrate nitrogen transfers and transformations in rural landscapes. Environmental Pollution 159, 3162-3170. DOI: 10.1016/j.envpol.2011.05.005

Salmon-Monviola, J., Durand, P., Ferchaud, F., Oehler, F., Sorel, L., 2012. Modelling spatial dynamics of cropping systems to assess agricultural practices at the catchment scale. Computers and Electronics in Agriculture 81, 1-13. DOI: 10.1016/j.compag.2011.10.020