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  • 1
    Language: English
    In: Grundwasser, Sept, 2010, Vol.15(3), p.145(1)
    Description: Byline: Olaf Kolditz (1), Thomas Kalbacher (1), Wenqing Wang (1) Author Affiliation: (1) Department Umweltinformatik, Helmholtz-Zentrum fur Umweltforschung GmbH -- UFZ, Permoserstrasse 15, 04318, Leipzig, Deutschland Article History: Registration Date: 21/06/2010 Online Date: 21/07/2010
    Keywords: Software
    ISSN: 1430-483X
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: Environmental Earth Sciences, 2011, Vol.64(5), pp.1323-1333
    Description: Water shortage and groundwater pollution have become two primary environmental concerns to Beijing since the 1990s. The local aquifers, as the dominant sources for domestic and agricultural water supply, are depleting due to groundwater abstraction and continuous drought in recent years with rapid urbanization and increasing water consumption. Therefore, understanding the hydrogeological system is fundamental for a sustainable water resources management. In this article, the numerical analysis of a 3-D regional groundwater flow model for the Nankou area is presented. The hydrogeological system is reproduced according to sparsely distributed boreholes data. The numerical analysis is carried out using the scientific software OpenGeoSys, which is based on the finite element method. The model calibration and sensitivity analysis are accomplished with inverse methods by applying a model independent parameter estimation system (PEST). The results of the calibrated model show reasonable agreements with observed water levels. The transient groundwater flow simulations reflect the observed drawdown of the last 9 years and show the formation of a depression cone in an intensively pumped area.
    Keywords: Groundwater modeling ; OpenGeoSys ; PEST ; Nankou
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 3
    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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  • 4
    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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  • 5
  • 6
    Language: English
    In: The Journal of Urology, April 2012, Vol.187(4), pp.e529-e529
    Keywords: Medicine
    ISSN: 0022-5347
    E-ISSN: 1527-3792
    Source: ScienceDirect Journals (Elsevier)
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  • 7
    Language: German
    In: Grundwasser, 9/2010, Vol.15(3), pp.145-145
    Keywords: Earth Sciences ; Geoecology/Natural Processes ; Soil Science & Conservation ; Applied Earth Sciences ; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution ; Hydrogeology ; Environmental Sciences ; Geography;
    ISSN: 1430-483X
    E-ISSN: 1432-1165
    Source: Springer (via CrossRef)
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  • 8
    Language: English
    In: Environmental Earth Sciences, 2012, Vol.65(5), pp.1395-1403
    Description: Hydrological research projects for integrated water resources management such as the IWAS initiative often accumulate large amounts of heterogeneous data from different sources. Given the number of partners taking part in such projects, surveying and accessing the available data sets, as well as searching for a defined subset, becomes increasingly difficult. We propose an integrated approach for a system combining visual data management and numerical simulation which allows to survey and select data sets based on keywords such as a region of interest or given indicators. An adequate 3D visualisation of such subsets helps to convey information and significantly supports the assessment of relations between different types of data. Furthermore, the interface between the visual data management system and finite element codes allows for the straightforward integration of information into the numerical simulation process and the subsequent visualisation of simulation results in a geographical context. We demonstrate typical workflows for integration and processing within the system based on data from the IWAS model region in Saudi Arabia and the TERENO Bode Observatory in the Harz Mountains in Germany. In addition, we present examples for data import and export based on established standard file formats.
    Keywords: Data exploration ; 3D visualisation ; Hydrological processes ; IWAS ; TERENO ; OpenGeoSys
    ISSN: 1866-6280
    E-ISSN: 1866-6299
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  • 9
    Language: English
    In: Advances in Water Resources, November 2017, Vol.109, pp.1-13
    Description: Geological heterogeneity, i.e. the spatial variability of discrete hydrogeological units, is investigated in an aquifer analog of glacio-fluvial sediments to determine how such a geological structure can be simplified for characterization needs. The aquifer analog consists of ten hydrofacies whereas the scarcity of measurements in typical field studies precludes such detailed spatial models of hydraulic properties. Of particular interest is the role of connectivity of the hydrofacies structure, along with its effect on the connectivity of mass transport, in site characterization for predicting early arrival times. Transport through three realizations of the aquifer analog is modeled with numerical particle tracking to ascertain the fast flow channel through which early arriving particles travel. Three simplification schemes of two-facies models are considered to represent the aquifer analogs, and the velocity within the fast flow channel is used to estimate the apparent hydraulic conductivity of the new facies. The facies models in which the discontinuous patches of high hydraulic conductivity are separated from the rest of the domain yield the closest match in early arrival times compared to the aquifer analog, but assuming a continuous high hydraulic conductivity channel connecting these patches yields underestimated early arrivals times within the range of variability between the realizations, which implies that the three simplification schemes could be advised but pose different implications for field measurement campaigns. Overall, the results suggest that the result of transport connectivity, i.e. early arrival times, within realistic geological heterogeneity can be conserved even when the underlying structural connectivity is modified.
    Keywords: Geological Heterogeneity ; Hydrofacies ; Aquifer Analog ; Arrival Times ; Subsurface Characterization ; Engineering
    ISSN: 0309-1708
    E-ISSN: 1872-9657
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  • 10
    Language: English
    In: Journal of Computational Physics, August 15, 2015, Vol.295, p.815(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jcp.2015.04.019 Byline: Wenkui He, Haibing Shao, Olaf Kolditz, Wenqing Wang, Thomas Kalbacher Author Affiliation: (a) Department of Environmental Informatics, Helmholtz Center for Environmental Research-UFZ, Permoserstrasse 15, Leipzig 04318, Germany (b) Faculty of Environmental Sciences, Technical University Dresden, Dresden, Germany (c) Faculty of Geosciences, Geotechnics and Mining, Freiberg University of Mining and Technology, Germany Article History: Received 16 July 2014; Revised 27 March 2015; Accepted 11 April 2015
    Keywords: Algorithms – Models ; Flow (Dynamics) – Models
    ISSN: 0021-9991
    Source: Cengage Learning, Inc.
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