Development and application of the modelling system J2000-S for the EU-water framework directive

摘要

The scientific sound definition of measures to achieve the goals of the EUwater framework directive (WFD) acquires spatially distributed analyses ofthe water and substance dynamics in meso- to macro-scale catchments. For thispurpose, modelling tools or systems are needed which are robust and fastenough to be applied on such scales, but which are also able to simulate theimpact of changes on single fields or small areas of a specific land use inthe catchment.To face these challenges, we combined the fully-distributed hydrologicalmodel J2000 with the nitrogen transport routines of the Soil Water AssessmentTool SWAT model, which are normally applied in a semi-distributive approach.With this combination, we could extend the quantitative focus of J2000 withqualitative processes and could overcome the semi-distributed limitation ofSWAT. For the implementation and combination of the components, we used theJena Adaptable Modelling System JAMS (Kralischand Krause, 2006) which helpedtremendously in the relatively rapid and easy development of the newresultant model J2000-S (J2000-Substance).The modelling system was applied in the upper Gera watershed, located inThuringia, Germany. The catchment has an area of 844 km2 andincludes three of the typical landscape forms of Thuringia. The applicationshowed, that the new modelling system was able to reproduce the dailyhydrological as well as the nitrogen dynamics with a sufficient quality. Thepaper will describe the results of the new model and compare them with theresults obtained with the original semi-distributed application of SWAT.