SWAT calculates hydrology as well as sediment, nitrogen and phosphorus transport in a catchment
SWAT is a simulation model developed in the U.S. for hydrological calculations and the simulation of sediment, nitrogen and phosphorus transport in a catchment. The model is process oriented and the smallest calculation unit is a combination of sub-catchment, soil type and land use/crop. The model has a high potential to calculate load and the effect of different measures. However, the SWAT model has very many parameters and places considerable demands on input and calibration data. Application of additional programs (e.g. SWAT-CUP) for calibration of the SWAT model can shorten the calibration times and provides the possibility for uncertainty analysis.
Ekstrand, S., Wallenberg, P., and Djodjic, F., 2010. Process Based Modeling of Phosphorus Losses from Arable Land. Ambio, 39:100–115.
Djodjic, F., Ulén, B., Kyllmar, K., 2010. Modeling Nitrogen and Phosphorus transport in a small agricultural stream in Eastern Sweden, page 94 in 6th International Phosphorus Workshop (IPW6), Book of Abstracts, Towards a sustainable control of diffuse P loss: risk, monitoring, modelling, and mitigation options.