Knowledge Resource Center for Ecological Environment in Arid Area
| Variable-Density Flow Processes in Porous Media On Small, Medium and Regional Scales | |
| Walther;Marc | |
| 出版年 | 2014 |
| 学位授予单位 | Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden |
| 英文摘要 | Nowadays society strongly depends on its available resources and the long term stability of the surrounding ecosystem. Numerical modelling has become a general standard for evaluating past, current or future system states for a large number of applications supporting decision makers in proper management. In order to ensure the correct representation of the investigated processes and results of a simulation, verification examples (benchmarks), that are based on observation data or analytical solutions, are utilized to evaluate the numerical modelling tool. In many parts of the world, groundwater is an important resource for freshwater. While it is not only limited in quantity, subsurface water bodies are often in danger of contamination from various natural or anthropogenic sources. Especially in arid regions, marine saltwater intrusion poses a major threat to groundwater aquifers which mostly are the exclusive source of freshwater in these dry climates. In contrast to common numerical groundwater modelling, density-driven flow and mass transport have to be considered as vital processes in the system and in scenario simulations for fresh-saltwater interactions. In the beginning of this thesis, the capabilities of the modelling tool OpenGeoSys are verified with selected benchmarks to represent the relevant non-linear process coupling. Afterwards, variable-density application and process studies on different scales are presented. Application studies comprehend regional groundwater modelling of a coastal aquifer system extensively used for agricultural irrigation, as well as hydro-geological model development and parametrization. In two process studies, firstly, a novel method to model gelation of a solute in porous media is developed and verified on small scale laboratory observation data, and secondly, investigations of thermohaline double-diffusive Rayleigh regimes on medium scale are carried out. With the growing world population and, thus, increasing pressure on non-renewable resources, intelligent management strategies intensify demand for potent simulation tools and development of novel methods. In that way, this thesis highlights not only OpenGeoSys’ potential of density-dependent process modelling, but the comprehensive importance of variable-density flow and transport processes connecting, both, avant-garde scientific research, and real-world application challenges. |
| 英文关键词 | Dichteabh?ngig Str?mung Stofftransport W?rmetransport Grundwasser Numerische Simulation Finite-Elemente-Verfahren FEM OpenGeoSys OGS Open Source Benchmark IWAS Oman Al-Batinah Arid Fallstudie Viskosit?t Gel Dichte Thermohaline Stabilit?t Variable-Density Density-Driven Density-Dependent Flow Mass Transport Heat Transport Numerical Simulation Finite-Element-Method FEM OpenGeoSys OGS Open Source Benchmark IWAS Oman Al-Batinah Case Study Arid Viscosity Gel Density Thermohaline Stability Ddc:550 Rvk:AR 22140 Rvk:AR 22600 Grundwasser Finite-Elemente-Methode Viskosit?t Temperatur Transportprozess Simulation Dichte Fallstudie Salzwasser-Sü?wasser-Grenze Salzwasser Meerwasser Oman Open Source Benchmark Semiarides Gebiet Gel Stabilit?t |
| 语种 | 英语 |
| URL | http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-153365 |
| 来源机构 | Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/248214 |
| 推荐引用方式 GB/T 7714 | Walther;Marc. Variable-Density Flow Processes in Porous Media On Small, Medium and Regional Scales[D]. Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden,2014. |
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