Modelling

River basin and landscape management needs an integrative and numeric analysis of system-specific, spatial and temporal correlations, supported by a complex modelling. Competed targets and possible solutions and management options have to be picked up, analyzed, visualized and discussed, in order to come to a resources management, that will be accepted by the different stakeholders.

Model Stoffbilanz

The Web GIS-based model STOFFBILANZ quantifies soil erosion as well as fluxes of water, sediment, nitrogen and phosphorus into water bodies. The model has been already applied successfully to simulate fluxes of water and pollutions at a regional scale in different river basins in Europe, Asia, and South-Africa. The model is thought for larger spatial units and aggregated spatial and temporal analyses. The general objective is to predict rather long-term trends with high relevance for planning purposes, than short term processes. Although, from the technological point simulation using higher temporal and spatial resolution is possible, we see general problems by applying detailed approaches into practice, for example data availability, user friendliness etc.
The model is especially useful as a component for the realization of the European Water Framework Directive:
+ Analysis of sources / critical source areas
+ Analysis of pathways
+ Risk analyses
+ Aggregation at different spatial levels

The STOFFBILANZ model is a toolbox, that is continuously in progress. It simulates soil erosion as well as water, sediment, nitrogen and phosphorus fluxes in landscapes and river basins. The software programming of the WebGIS based development branch (including STOFFBILANZviewer) is based on PostgreSQL/C++/Mapserver.
Get more information: www.viewer.stoffbilanz.de and www.stoffbilanz.de

Scenario definition and mitigation options to reduce diffuse and point source pollution in surface waters and groundwater are included in the system to contribute to an integrated water resources management. Our company GALF bR holds the devolopment and commercial rights for the different software branches STOFFBILANZ, STOFFBILANZviewer , STOFFBILANZ_BW and STOFFBILANZ_Logar.

Milestones

Modelling of sediment and nutrient input into river basins by the STOFFBILANZ software was supported by different german and french authorities of water and agricultural management. Up to now the toolbox was used in different mid-european regions as well as in Asia (China), South-Africa. Important milestones:

2015 The integration of a matrix calculator allows to handle very large datasets in STOFFBILANZ
2013 STOFFBILANZ is used as simulation tool in the collaborative project “SPACES-SGD” (funded by the german BMBF)
2012 Upgrade of the WebGIS based STOFFBILANZviewer.
2012 A daily based modelling was introduced to simulate runoff, soil erosion, sediment and particulate nutrient input in the Miyun basin near Beijing (BMBF-funded project , FKZ 02WM1049).
2011 Mitigation options to reduce soil erosion, sediment and nutrient inputs were integrated to improve river basin management according to EU-WRRL in Saxony (granted by LfULG).
2010 Implementation of a research project focusing on a supposed increase of „non-food-crops“. Consequences to water budgets and water pollution were investigated by scenario calculations up to 2020.
2009 The long-term average annual retention of phosphorus in the flooding zone can be derived from the sedimentation rate and the corresponding particulate P-concentration in sediment per surface water body.
2009 Retention of nitrogen in surface water is realized, considering the potential N-uptake rate by the sediment and the water residence time (Nutrient Spiralling concept).
2009 The methodology to calculate groundwater residence time in loose rock aquifers was improved by a darcy based multiple flow algorithm.
2009 Development of STOFFBILANZ_Logar in the EU-project „LOGAR“ in the upper-rhine valley by LUBW Karlsruhe, LTZ Augustenberg, Region Alsace, Agence de l’eau Rhin-Meuse, DIREN Alsace, BRGM in cooperation to GALF bR.
2008 Release of the WebGIS based STOFFBILANZviewer.
2008 The methodology to generate dissolved nitrogen inputs was improved with a special focus on nitrogen mobilisation and immobilisation on cropland.
2007 Implementation of a research project to calculate diffuse and point source nutrient input in Saxony (granted by LfULG).
2007 Development of the STOFFBILANZ_BW model, adapted to the special conditions in Federal State of Baden-Württemberg in cooperation with LTZ Augustenberg.
2006 Simulation of sediment and particulate nutrient input into surface waters is improved by considering the likeliness of connectivity of erosive areas to the river net (DFG-Projekt GR 1432/5).
2006 Simulation of nitrate budgets in the upper rhine catchment by the STOFFBILANZ model in the EU-project „MoNit“ , as part of a model chain (e.g. groundwater model, plant model, socio-economic model).