Influence of internal spatial aggregation procedures of the SWAT model on the modelling of the rainfall runoff processes in the Dyle catchment at 2 different scales
(2003) EGU General Assembly — Location: Nice, France
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- The sensitivity of the surface hydrological component of the spatially distributed hydrological model SWAT( ARCVIEVTM version) to internal spatial aggregation procedures was tested for the Dyle catchment and for its subcatchment of the Thyle (Belgium). For this analysis, use was made of the generalised soil association map at the scale of 1:500.000, and the land use map created in an earlier study . Uncalibrated simulations were performed for both catchments using the same input and parameterisation, changing only the catchment size and thereby the creation of the Hydrological Response Units (HRU) , its distribution within the catchments and its parametrisation.. The results suggest that the SWAT model is very sensitive to the internal procedures defining the HRU size and distributions and also to the way how soil and land use are assigned to the HRU (using either the dominant or multiple class option). This also suggests that the use of the same underlying input data but for different catchment sizes will affect modelling performance. Internal GIS functions transform the basic soil and land use data prior to hydrological modelling. This will complicate the upscaling of hydrological processes by means of the SWAT model. Acknowledgements This research was carried out within the framework of the EU Mulino project (contract no. EVK1-2000-22089). The authors would also like to acknowledge the developers of the AvSwat interface.
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Romanowicz, A., Vanclooster, M., Rounsevell, M., & La Jeunesse, I. (2003). Influence of internal spatial aggregation procedures of the SWAT model on the modelling of the rainfall runoff processes in the Dyle catchment at 2 different scales. Geophysical Research Abstracts, p. EAE03-A-10238. https://hdl.handle.net/2078.5/154333