Untersuchungen zum Transport von gelösten Stoffen und Partikeln duch heterogene Porengrundwasserleiter
Untersuchungen zum Transport von gelösten Stoffen und Partikeln duch heterogene Porengrundwasserleiter
Due to heavy industrialization and intensive farming contamination of groundwater, which is used for drinking-water supply, is reported more frequently. To increase the comprehension of the transport- and reaction-mechanisms of contaminants, detailed experimental analysis as well as mathematical and...
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Personal Name(s): | Seidemann, R. W. (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
1998
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Physical Description: |
XII, 208 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3481 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Due to heavy industrialization and intensive farming contamination of groundwater, which is used for drinking-water supply, is reported more frequently. To increase the comprehension of the transport- and reaction-mechanisms of contaminants, detailed experimental analysis as well as mathematical and numerical modeling are of great interest. Hereby not only an academic objective is pursued, also new methods are developed to enforce reliable forecasts. Those are e.g. risk assessments or storage calculations for aquifers. The work presented here mainly deals with aspects of the numerical simulation of water flow and solute transport in porous media. At this the term 'solute transport' includes both, the transport of solutes dissolved in water as well as the transport of suspended particles. The latter point obtains increasing attention, because within the scope of water production by bank filtration more often contaminations caused by suspended particles are reported. By solving a problem numerically the size of the model and the discretisation of the mesh is often limited by the memory capacity of the computer. In most cases an area with asufficient discretisation is to small and therefore unsatisfactory, because not all influences can be taken into account. On the other hand a discretisation which is too wide allows the calculation of a greater area, but may lead to numerical difficulties calculating the solute transport. The parallelisation of the program $\textit{TRACE}$ was considered as a possible way out. Besides the fact that, by reason of the method utilized ($\textit{domain decomposition}$), it is possible to calculate a greater model with a fine discretisation, the shortening of the program run-time has to be mentioned positive. A central part of this thesis is the presentation of the parallelisation method implemented in the FE-program $\textit{TRACE}$. As mentioned above the transport of contaminants whieh reach a weil pick-a-back onsuspended particles is shifted to the focus of interest. By implementing a suitable algorithm into the program $\textit{TRACE}$ facilities were created which allow the numerical calculation of particle transport. To be able to calculate water flow and solute transport numerieally, various model properties have to be defined. In most cases homogeneous aquifer properties are utilized, despite the fact that a natural geologie body is heterogeneous. The reason therefore is the insufficient characterization of the properties of the aquifer, which allows no differentiated characterization than a homogeneous one. Another reason is the limitation by most software, allowing no complex area characterisation. This limitation has been removed within $\textit{TRACE}$, which gives the capability to calculate with heterogeneous defined aquifer- and sorption-properties. To investigate the influence of heterogeneity of various parameters on water flow and solute transport numerous calculations have been made. |