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  • Springer (CrossRef)  (76)
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Year
  • 1
    Language: English
    In: Environmental Earth Sciences, 2012, Vol.67(6), pp.1859-1859
    Description: Byline: Olaf Kolditz (1,2), Karsten Rink (1), Haibing Shao (1), Thomas Kalbacher (1), Ralf Kunkel (3), Steffen Zacharias (1), Peter Dietrich (1,4) Author Affiliation: (1) Helmholtz Centre for Environmental Research-UFZ, Permoserstrasse 15, 04318, Leipzig, Germany (2) Applied Environmental Systems Analysis, Technische Universitat Dresden, 01062, Dresden, Germany (3) Forschungszentrum Juelich GmbH, 52425, Juelich, Germany (4) Environmental and Engineering Geophysics, Eberhard-Karls-University of Tubingen, Holderlinstrasse 12, 72074, Tubingen, Germany Article History: Registration Date: 27/08/2012 Online Date: 12/09/2012 Article note: The online version of the original article can be found under doi: 10.1007/s12665-012-1661-8. The online version of the original article can be found at http://dx.doi.org/10.1007/s12665-012-1661-8.
    Keywords: Geophysics -- Models;
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 2
    Language: English
    In: Environmental Earth Sciences, 2012, Vol.66(4), pp.1279-1284
    Description: Byline: Olaf Kolditz (1,2), Karsten Rink (1), Haibing Shao (1), Thomas Kalbacher (1), Steffen Zacharias (1), Peter Dietrich (1,3) Author Affiliation: (1) Helmholtz Centre for Environmental Research-UFZ, Permoserstrasse 15, 04318, Leipzig, Germany (2) Applied Environmental Systems Analysis, Technische Universitat Dresden, 01062, Dresden, Germany (3) Environmental and Engineering Geophysics, Eberhard-Karls-University of Tubingen, Holderlinstrasse 12, 72074, Tubingen, Germany Article History: Registration Date: 27/03/2012 Online Date: 19/04/2012 Article note: A German-wide Earth observation network, TERENO, was launched 3 years ago by the Helmholtz Association and now brings together climate and environmental research from the Alps to the Baltic coast. UFZ researchers from the Department of Environmental Informatics, Karsten Rink, Haibing Shao, Thomas Kalbacher, and Olaf Kolditz together with colleagues from the Department of Monitoring and Exploration Technologies, Steffen Zacharias and Peter Dietrich outline how their collaborative work embarks on new paths with this long-term environmental observation system. Dr. Olaf Kolditz heads UFZ's Department of Environmental Informatics and chairs the Department of Applied Environmental Systems Analysis at Technical University of Dresden. Dr. Peter Dietrich heads UFZ's Department of Monitoring und Exploration Technologies and is also the Professor for Environmental and Engineering Geophysics at the Eberhard-Karls-University of Tubingen.
    Keywords: Geophysics;
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 3
    Language: English
    In: Environmental Earth Sciences, 2015, Vol.73(11), pp.6727-6732
    Description: Byline: Olaf Kolditz (1,2,3), Heping Xie (4), Zhengmeng Hou (5,6,7), Patrick Were (5), Hongwei Zhou (8) Author Affiliation: (1) Helmholtz Centre for Environmental Research UFZ, Permoserstra[sz]e 15, 04318, Leipzig, Germany (2) Technische Universitat Dresden, Helmholtzstra[sz]e 10, 01062, Dresden, Germany (3) Sino-German Research Centre for Environmental Information Science (RCEIS), Permoserstra[sz]e 15, 04318, Leipzig, Germany (4) Sichuan University, 610064, Chengdu, China (5) Energy Research Center of Lower Saxony (EFZN), Clausthal University of Technology, Am Stollen 19, 38640, Goslar , Germany (6) Sino-German Energy Research Center, Sichuan University, 610064, Chengdu, China (7) Institute of Petroleum Engineering, Clausthal University of Technology, Agricolastra[sz]e 10, 38678, Clausthal-Zellerfeld, Germany (8) State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xueyuan Road D11, 100083, Haidian, Beijing, China Article History: Registration Date: 16/04/2015 Received Date: 08/04/2015 Accepted Date: 15/04/2015 Online Date: 25/04/2015
    Keywords: Computer Storage Device Industry;
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 4
    Language: English
    In: Environmental Earth Sciences, 2013, Vol.70(7), pp.3363-3380
    Description: As part of the HG-A experiment in the Mont Terri Rock Laboratory, large-scale in situ water/gas injection experiments was conducted in a microtunnel. This research work focuses on the numerical analysis of the experimental data and the in situ observations. Concerning a temporary change of the hydromechanical properties of Opalinus Clay during experimental operations, three phases were numerically interpreted. These included the generation of excavation damaged zone during tunnel excavation, in which highly permeable flow paths around the tunnel have been formed; the self-sealing effect during water tests; and the pressure evolution during a long-term gas injection test. A coupled two-phase flow and mechanics model, taking into account the strong anisotropic properties of Opalinus Clay, was developed to interpret the measured data. The hydraulic anisotropy was described by a transversely isotropic permeability tensor. An elasto-plastic model was established to consider both stiffness anisotropy and strength anisotropy. Anisotropic plasticity was studied using the microstructure tensor method.
    Keywords: HM coupling ; Anisotropy ; In situ injection experiment ; Mont Terri Rock Laboratory ; EDZ
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 5
    Language: English
    In: Environmental Earth Sciences, Sept, 2012, Vol.67(2), p.307(4)
    Description: Byline: Michael Kuhn (1), Uwe-Jens Gorke (2), Jens T. Birkholzer (3), Olaf Kolditz (2,4) Author Affiliation: (1) Helmholtz Centre Potsdam, GFZ, German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany (2) Helmholtz Centre for Environmental Research, UFZ, Permoserstrasse 15, 04318, Leipzig, Germany (3) Earth Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA, 94720, USA (4) TU Dresden, Helmholtzstrasse 10, 01062, Dresden, Germany Article History: Registration Date: 14/06/2012 Received Date: 12/06/2012 Accepted Date: 14/06/2012 Online Date: 07/07/2012
    Keywords: Environmental Sciences ; Geosciences ; Environmental Sciences ; Geology;
    ISSN: 1866-6280
    E-ISSN: 18666299
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  • 6
    Language: English
    In: Environmental Earth Sciences, 2012, Vol.67(2), pp.613-632
    Description: The idea of this paper is twofold. On one hand, we propose a general systematic for benchmarking of CO 2 modelling. On the other hand, we integrate material from the CLEAN project into this framework to demonstrate its applicability (Kühn et al. in Environ Earth Sci, this issue 2011). Benchmarks are an important instrument to gain a better understanding of interacting physico-chemical processes and they are a necessary tool to verify the algorithms and the software dedicated to simulate the separated and differently coupled thermo-hydro-mechanical/chemical processes during injecting and storing CO 2 in the subsurface. In general we distinguish between process- and site-related test cases. Process-related benchmarks deal with the required complexity of process coupling as well as equations of state for fluids and constitutive laws for geologic formations. Site-specific benchmarks represent different geological settings for potential CO 2 reservoirs, e.g., depleted gas and oil reservoirs as well as deep saline aquifers. The data basis for benchmarking mainly comes from experimental work in the CLEAN project as well as from literature. The benchmarking systematic is aimed at serving as basis for process studies, experimental design as well as for code inter-comparison purposes not only for numerical tools having used by the CLEAN partners but also for upcoming international benchmarking initiatives as well.
    Keywords: CLEAN ; CO2BENCH ; Benchmarking ; CO modelling ; OpenGeoSys ; Depleted gas reservoirs ; Deep saline aquifers ; Natural analogues
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 7
    Language: English
    In: Environmental Earth Sciences, 2014, Vol.72(10), pp.3749-3751
    Description: In recent years, the amount of environmental data that is measured, collected and analysed has risen in staggering amounts. Developing effective visualisation techniques is the key to improving the understanding of complex data sets and communicate findings to the public in general and stakeholders in particular.
    Keywords: Visualization ; Information Management ; Environmental Protection;
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 8
    Language: English
    In: Environmental Earth Sciences, 2014, Vol.72(10), pp.3857-3868
    Description: We present a framework that allows users to apply a number of strategies to view and modify a wide range of environmental data sets for the modelling of natural phenomena. These data sets can be concurrently visualised to find inconsistencies or artefacts. This ensures at an early stage that models set up for the simulation of hydrological or thermal processes will not give implausible results due to complications based on input data. A number of generally applicable visualisation techniques are provided by our framework to help researchers detect potential problems. We also propose a number of mapping algorithms for the integration of multiple data sets to resolve some of the most common issues. Techniques for the presentation of input- and modelling data in combination with simulation results are proposed with respect to the benefits of visualisation of environmental data within specialised environments. The complete workflow from input data to presentation is demonstrated based on a case study in Central Germany. We identify typical problems, propose approaches for a suitable data integration for this case study and compare results of the original and modified data sets.
    Keywords: Computer graphics ; Visualisation ; Virtual reality ; Hydrology ; OpenGeoSys Data Explorer
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 9
    Language: English
    In: Environmental Earth Sciences, 2014, Vol.72(10), pp.3795-3802
    Description: Current visualization techniques for computational fluid dynamics applications are sophisticated and work well in simple geometries. For complex geometries such as pore spaces, multiple domain boundaries obstruct the view and make the studying of fluid flow fields difficult. To overcome these deficiencies, we use two-sided materials to render the domain boundaries. Using this technique, it is possible to place the camera inside the domain and have a non-obstructed view of the surrounding flow field without losing spatial reference to the domain boundaries. As a result, a larger part of fluid flow visualization is visible. Two-sided material rendering was successfully applied to display still images with Blender Cycles renderer, in a virtual reality environment, and several implementation techniques were explored for using the Visualization Toolkit.
    Keywords: 3D Graphics ; Virtual reality ; Image generation ; VTK ; OpenGL ; VISLab TESSIN
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 10
    Language: English
    In: Environmental earth sciences, 2012, Vol.67(2), pp.549-561
    Description: The objective of this paper was to investigate the THM-coupled responses of the storage formation and caprock, induced by gas production, CO₂-EGR (enhanced gas recovery), and CO₂-storage. A generic 3D planer model (20,000 × 3,000 × 100 m, consisting of 1,200 m overburden, 100 m caprock, 200 m gas reservoir, and 1,500 m base rock) is adopted for the simulation process using the integrated code TOUGH2/EOS7C-FLAC3D and the multi-purpose simulator OpenGeoSys. Both simulators agree that the CO₂-EGR phase under a balanced injection rate (31,500 tons/year) will cause almost no change in the reservoir pressure. The gas recovery rate increases 1.4 % in the 5-year CO₂-EGR phase, and a better EGR effect could be achieved by increasing the distance between injection and production wells (e.g., 5.83 % for 5 km distance, instead of 1.2 km in this study). Under the considered conditions there is no evidence of plastic deformation and both reservoir and caprock behave elastically at all operation stages. The stress path could be predicted analytically and the results show that the isotropic and extensional stress regime will switch to the compressional stress regime, when the pore pressure rises to a specific level. Both simulators agree regarding modification of the reservoir stress state. With further CO₂-injection tension failure in reservoir could occur, but shear failure will never happen under these conditions. Using TOUGH-FLAC, a scenario case is also analyzed with the assumption that the reservoir is naturally fractured. The specific analysis shows that the maximal storage pressure is 13.6 MPa which is determined by the penetration criterion of the caprock. ; p. 549-561.
    Keywords: Wells ; Models ; Deformation ; Carbon Dioxide
    ISSN: 1866-6280
    E-ISSN: 18666299
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