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Auflistung nach Autor:in "Holzbecher, Ekkehard"

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  • Konferenzbeitrag
    A Coupled Model for Transport, Geochemistry and Redox Processes
    (The Information Society and Enlargement of the European Union, 2003) Horner, Christoph; Holzbecher, Ekkehard; Wiese, Bernd; Nützmann, Gunnar
    A reactive multicomponent chemical transport model to describe redox processes during bank-filtration dealing with equilibrium chemistry and Kinetics of biodegradation is presented. The model approach considers hydrodynamic transport, biodegradation kinetics and equilibrium chemistry speciation. Due to their different mathematical character the transport and reaction model subsets are coupled by a two step procedure (“operation splitting”). The multi species hydrodynamic advection-dispersion subset is a partial differential equation system, the Kinetics subset are ordinary differential equation systems, and the equilibrium subset is a nonlinear algebraic equation system. The model was set up using user friendly software tools as ModelMaker 3 an MATLAB4 which offer powerful tools to solve partial differential and ordinary differential equation systems. The model is demonstrated to three test-cases typical for river bank-filtration and verified by available geochemical software. Topic: Modelling and simulation of environmental systems
  • Konferenzbeitrag
    What is a Coupled Model?
    (The Information Society and Enlargement of the European Union, 2003) Holzbecher, Ekkehard
    The attribute 'coupled' for a model can be found frequently in the modelling and simulation literature. A detailed look reveals that there are various different meanings. There are coupled processes, coupled compartments, coupled mathematical equations and coupled software codes. Despite all differences in almost all occurrences the attribute of coupling is used to describe feedback, which is more complex than what is meant by the terms link, connection or influence. A systematic approach is presented aimed to structure and classify different models. Some examples, mainly from environmental modelling, accompany the general line as explained above. They are mostly taken from hydrological sciences and problems concerning the water cycle or parts of it.