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Wyniki nadające się do wykorzystania
A modelling environment was developed, within which the user can construct diagenetic models which simulate the early diagenesis of C, N, P, S, Fe and Mn, and predict pH profiles in both marine and estuarine sediments. It is termed a modelling environment rather than a model because it can handle different model formulations without alteration of the source code. The model can be extended with new species and reactions through a user-interface without the need for recompilation. Both steady-state and dynamic simulations can be performed.
The flexibility and the modular structure of MEDIA results from an object-oriented approach in FORTAN95 standard programming language. Special attention was given to combine a performing numerical solution with an extended reversible reaction set, which consists both of acid-base and absorption reactions. The numerical solution procedures used guarantee a highly efficient CPU usage and shirt execution time, even with an extensive reaction set.
The modelling environment is available for anyone wishing to use it or to improve it.
Summary :
Basic scientific knowledge has been obtained on a large number of processes affecting the exchange of sediments, carbon and nutrients between the water column and the sediment of tidal flats. These processes are related to the structure and functioning of the sediment-dwelling ecological community. Knowledge of the processes is needed to link the structure of the communities observed to the forcing of the systems, eg by currents, nutrient advection, suspended particulate matter, etc. Changes in the latter forcing may be due to anthropogenic influences or to global change, and their effects on the functioning of the ecosystem are a matter of great concern.
Our results describe erosion-deposition processes and the influence of the biota (algal mats, macrobenthic animals) on them from different points of view. The functioning of the benthic food web was described using measurements on the structure and activity of all the main groups involved. We developed species 'ecoprofiles' for dominant macrobenthic animals of tidal flat communities, and successfully predicted species occurrence in a validation estuary from the observed forcing of the system.
These results are or will be published in the open literature.
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