Publications Prof. Dr. Thomas Ptak-Fix

Brauchler R., Hu R., Hu L., Jimenez S., Bayer P., Dietrich P., Ptak T. (2013) Rapid field application of hydraulic tomography for resolving aquifer heterogeneity in unconsolidated sediments. Water Resources Research 49, 1?12 (doi:10.1002/wrcr.20181).

Ghergut J., Bensabat J., Niemi A., Licha T., Ptak T., Sauter M. (2013) CCS site characterization by single-well and inter-well tracer tests. Stanford Geothermal Program ? Technical Reports, SGP-TR-198: 316-325. [ISSN: 1058-2525]

Ptak T., Kirchholtes H., Hiesl E., Holder T., Rothschink P., Hekel U., Beer H.-P., Ertel T., Herold M., Koschitzky H.-P. (2013) Grundwasserabstromerkundung mittels Immissionspumpversuchen - Aktualisierung, Stand der Technik, Planung, Implementierung, Anwendungsstrategien. Altlastenforum Baden-Württemberg e.V., Stuttgart, Schriftenreihe des Arbeitskreises Innovative Erkundungs-, Sanierungs- und Überwachungsmethoden, Heft 16, Schweizerbart?sche Verlagsbuchhandlung, Stuttgart, ISBN 978-3-510-39016-8.

Rahman M. A., Wiegand B., Badruzzaman A.B.M., Ptak T. (2013) Hydrogeological Analysis of Upper Dupitila Aquifer towards the Implementation of Managed Aquifer Recharge project in Dhaka City, Bangladesh. Hydrogeology Journal (doi:10.1007/s10040-013-0978-z).

Yang J., Graf T. , Herold M., Ptak T. (2013) A fully coupled surface-subsurface approach to simulate flow dynamics in coastal aquifers. Journal of Contaminant Hydrology 149, 61-75

Brauchler R., Hu R., Hu L., Ptak T. (2012) Bestimmung von hydraulischen Parametern in Lockergesteinen: Ein Vergleich unterschiedlicher Feldmethoden. (Investigation of hydraulic parameters in unconsolidated sediments: A comparison of methods.) Grundwasser 2012, 17, 57-67 (doi: 10.1007/s00767-011-0185-6).

Béland-Pelletier C., Fraser M., Barker J., Ptak T. (2011) Estimating contaminant mass discharge: A field comparison of the multilevel point measurement and the integral pumping investigation approaches and their uncertainties. Journal of Contaminant Hydrology, 122, 63?75, doi: 10.1016/j.jconhyd.2010.11.004, ISSN 0169-7722.

Herold M., Greskowiak J., Ptak T., Prommer H. (2011) Modelling of an enhanced PAH attenuation experiment and associated biogeochemical changes at a former gasworks site in southern Germany. Journal of Contaminant Hydrology, 119, 99-112.

Brauchler R., Hu R., Vogt T., Halbouni D., Heinrichs T., Ptak T., Sauter M. (2010) Cross-well slug interference tests: An effective characterization method for resolving aquifer heterogeneity. Journal of Hydrology 384 (2010) 33-45 (doi:10.1016/j.jhydrol.2010.01.004).

Leven C., Weiß H., Koschitzky H.-P., Blum P., Ptak T., Dietrich P. (2010) Direct-Push-Verfahren. Altlastenforum Baden-Württemberg e.V., Stuttgart, Schriftenreihe des Arbeitskreises Innovative Erkundungs-, Sanierungs- und Überwachungsmethoden, Heft 15, Schweizerbart?sche Verlagsbuchhandlung, Stuttgart, ISBN 978-3-510-39015-1.

Rahman M.A., Nödler K., Barbieri M., Sanchez-Vila X., Ptak T., Sauter M., Licha T. (2010) Occurrence and behavior of selected pharmaceutical compounds during soil passage under infiltration ponds. Deliverable 33 of EU Project Gabardine, 30p.

Brauchler, R., Hu, R., Vogt, T., Al-Halbouni, D., Heinrichs, T., Ptak, T., Sauter, M. (2010): Cross-well slug interference tests: An effective characterization method for resolving aquifer heterogeneity. Journal of Hydrology (in press).

Herold, M., Ptak, T., Bayer-Raich, M., Wendel, T., Grathwohl, P. (2009): Integral quantification of contaminant mass flow rates in a contaminated aquifer: Conditioning of the numerical inversion of concentration-time series. Journal of Contaminant Hydrology, 106(1-2), pp. 29-38.

Herold, M., Ptak, T., Bayer-Raich, M., Wendel, T., Grathwohl, P. (2009): Integral quantification of contaminant mass flow rates in a contaminated aquifer: Conditioning of the numerical inversion of concentration-time series. Journal of Contaminant Hydrology, 106(1-2), pp. 29-38.

Ptak, T., Jarsjö, J. (2008): ?Characterization of groundwater contamination and natural attenuation potential at multiple scales?, in: Groundwater Science & Policy, Editor: Ph. Quevauviller, Publisher: RSC (Royal Society of Chemistry), Cambridge, UK, 240-268, ISBN 978-085404-294-4.

Herold, M., Ptak, T., Wendel, T., Grathwohl, P. (2008): Bestimmung der Schadstofffrachten an Kontrollebenen mithilfe von Punktkonzentrationsmessungen und Immissionspumpversuchen ? ein Vergleich. Grundwasser, 14(4), pp. 231?240.

Riva, M., Guadagnini, A., Fernandez-Garcia, D., Sanchez-Vila, X., Ptak, T. (2008): Relative importance of geostatistical and transport models in describing heavily tailed breakthrough curves at the Lauswiesen site. Journal of Contaminant Hydrology, 101, 1-14, ISSN 0169-7722.

Herold, M., Ptak, T., Prommer, H., Greskowiak, J., Wendel, T., Grathwohl, P. (2008) Process-oriented Reactive Transport Modelling of Heterocyclic Hydrocarbons at a former Gasworks Site in Southern Germany. MGP Europe, 4.-6- März 2008, Dresden, Germany:255-261.

Ptak, T., Jarsjö, J. (2008): ?Characterization of groundwater contamination and natural attenuation potential at multiple scales?, in: Groundwater Science & Policy, Editor: Ph. Quevauviller, Publisher: RSC (Royal Society of Chemistry), Cambridge, UK, 240-268, ISBN 978-085404-294-4.

Neuman, S. P., A. Blattstein, M. Riva, D. M Tartakovsky, A. Guadagnini, and T. Ptak (2007). Type curve interpretation of late-time pumping test data in randomly heterogeneous aquifers. Water Resour. Res., 43, W10421, doi:10.1029/2007WR005871.

Herold, M., Ptak, T., Wendel, T., Grathwohl, P. (2008): Integrale Quantifizierung von Schadstoffmassenflüssen im Grundwasser ? Konditionierung der numerischen Inversion der Konzentrationsganglinien von Immissionspumpversuchen. Grundwasser, 14(1), pp. 4-14.

Herold, M., Ptak, T., Wendel, T., Grathwohl, P. (2008): Bestimmung der Schadstofffrachten an Kontrollebenen mithilfe von Punktkonzentrationsmessungen und Immissionspumpversuchen ? ein Vergleich. Grundwasser, 14(4), pp. 231?240.

Bayer-Raich, M., Jarsjö, J., Liedl, R., Ptak, T., Teutsch, G. (2006): ?Integral pumping test analyses of linearly sorbed groundwater contaminants using multiple wells: Inferring mass flows and natural attenuation rates?, Water Resour. Res., Vol. 42, W08411, doi:10.1029/2005WR004244.

Riva, M., Guadagnini, L., Guadagnini, A., Martac, E., Ptak T. (2006): ?A composite medium approach for probabilistic modelling of contaminant travel time distribution to a pumping well in a heterogeneous aquifer?, in: ModelCare 2005: Calibration and Reliability in Groundwater Modelling: From Uncertainty to Decision Making, IAHS Publication 304, 227- 233, ISSN 0144-7815, ISBN 1-901502-58-9.

Ptak, T., Bayer-Raich, M., Bauer, S. (2006): ?Multilevel Integral Investigation of Contamination in Large Polluted Aquifers?, in: MODFLOW and MORE 2006 ? Managing Ground Water Systems, Conference Proceedings, Poeter, Hill, Zheng, International Ground Water Modeling Center (IGWMC), Colorado School of Mines, www.mines.edu/igwmc/, 574-578.

Riva, M., Guadagnini, L., Guadagnini, Ptak T., Guadagnini, A., Martac, E. (2006): ?Probabilistic study of well capture zones distribution at the Lauswiesen field site?, J. Contam. Hydrol., 88, 92-118, ISSN 0169-7722.

Piepenbrink, M., de Biase, C., Dietze, M., Grathwohl, P., Herold, M., Ptak, T., Trötschler, O., Haslwimmer, T., Koschitzky, H.P. (2006): ?Enhanced Natural Attenuation (ENA) zur biologischen In-Situ-Sanierung von NSO Heterozyklen im Grundwasser: Verfahrensentwicklung im Technikums-Maßstab sowie Pilotanwendung an einem ehemaligen Gaswerksstandort?, in VEGAS-Statuskolloquium 2006, Braun, Koschitzky, Stuhrmann (Hrsg.), Mitteilungen des Instituts für Wasserbau, Universität Stuttgart, H. 150, 1 ? 10, ISBN 3-933761-53-0, ISSN 0343-1150.

Piepenbrink, M., Krüger, M., Ptak, T., Grathwohl, P.(2005): ?Natural attenuation of N-S-O heteroaromatic compounds in groundwater: chemical analyses, reactive transport experiments and field studies?, in: Groundwater Quality 2004: Bringing Groundwater Quality Research to the Watershed Scale, IAHS Publication 297, 338-345, ISBN 1-901502-18-X.

Jarsjö, J., Bayer-Raich, M., Ptak, T. (2005): ?Monitoring groundwater contamination and delineating source zones at industrial sites: Uncertainty analyses using integral pumping tests?, Journal of Contaminant Hydrology, 79, 107-134, ISSN 0169-7722.

Piepenbrink, M., Ptak, T., Grathwohl, P. (2005): ?Monitored natural attenuation: Sampling bias by monitoring equipment?, in: Contaminated Soil 2005, 1223, Forschungszentrum Karlsruhe, ISBN 3-923704-50-X.

Ptak, T., Piepenbrink, M., Grathwohl, P. (2005): ?Natural Attenuation of N-S-O Heteroaromatic Compounds in Groundwater: Field Studies?, in: Contaminated Soil 2005, 1447-1450, Forschungszentrum Karlsruhe, ISBN 3-923704-50-X.

Rolle, M., Piepenbrink, M., Prommer, H., Ptak, T., Grathwohl, P. (2005): ?Contaminant transport scenario modelling as a tool for a critical evaluation of natural attenuation?, Aquifer Vulnerability and Risk, 2nd International Workshop and 4th Congress on the Protection and Management of Groundwater, Parma, Italy, September 21-23, 2005, GEAM (Associazione Georisorse e Ambiente), p. 86, 14 pages, CD-ROM, ISBN 88-901342-2-4.

Peter, A., Steinbach, A., Liedl, R., Ptak, T., Michaelis, W. and Teutsch, G. (2004): ?Assessing microbial degradation of BTEX compounds at field-scale using an itegral groundwater investigation approach combined with compound-specific isotope analyses?, J. Contam. Hydrol., 71, 127-154.

Ptak, T., Piepenbrink, M. and Martac, E. (2004): ?Tracer tests for the investigation of heterogeneous porous media and stochastic modelling of flow and transport ? a review of some recent developments?, J. Hydrol., 294, 122-163.

Bauer, S., Bayer-Raich, M., Holder, T., Kolesar, Ch., Müller, D. and Ptak, T. (2004): ?Quantification of groundwater contamination in an urban area using integral pumping tests?, Journal of Contaminant Hydrology, 75, 183-213, ISSN 0169-7722.

Piepenbrink, M., Krüger, M., Ptak, T., Grathwohl, P. (2004): ?Enhanced Natural Attenuation zum In-Situ-Abbau von heterozyklischen Kohlenwasserstoffen: Versuche im Labor-, Technikum- und Feldmaßstab?, in: VEGAS-Statuskolloquium 2004, Barczewski et al. (Hrsg.), Mitteilungen des Instituts für Wasserbau, Universität Stuttgart, H. 131, 8-17, ISBN 3-933761-35-2.

Piepenbrink, M., Krüger, M., Ptak, T., Grathwohl, P. (2004): ?Enhanced Natural Attenuation zum In-Situ-Abbau von heterozyklischen Kohlenwasserstoffen- Optimierung der Analytik, Felduntersuchungen und reaktive Transportmodellierung?, in: KORA, Kontrollierter natürlicher Rückhalt und Abbau von Schadstoffen bei der Sanierung kontaminierter Grundwässer und Böden, Statusseminar 2004, Leipzig, UFZ-Umweltforschungszentrum Leipzig-Halle (Hrsg.), 88-93.

Bayer-Raich, M., Jarsjö, J., Liedl, R., Ptak, T., Teutsch, G. (2004): ?Average contaminant concentration and mass flow in aquifers from time dependent pumping well data: analytical framework?, Water Resour. Res., 40, W08303,doi:10.1029/2004WR003095.

Ptak, T. Bayer-Raich, M., Bauer, S. (2004): ?Tiefenorientierte integrale Erkundung von Schadstofffrachten und Konzentrationen in großräumig kontaminierten Aquiferen?, Grundwasser, 4(9), 235-247.

Ptak, T., Jarsjö, J., Bayer-Raich, M., Holder, T. and Teutsch, G. (2004): ?The integral groundwater investigation method: principles, application and evaluation?, IGEA (Ingegneria e Geologia Degli Acquiferi ? Groundwater Geoengineering), No. 19, 14-27, ISSN 1121-9041.

Bauer, S., Bayer-Raich, M., Holder, T., Kolesar, C., Müller, D. and Ptak, T. (2004): ?Plume screening and source tracking at the INCORE Linz field site using integral pumping tests?, IGEA (Ingegneria e Geologia Degli Acquiferi ? Groundwater Geoengineering), No. 19, 27-39, ISSN 1121-9041.

Zanini, A., Alberti, L., Ceccon, S., Bauer, S., Ptak, T. and Tanda M.G. (2004): ?Application of the integral pumping test method in Milan?, IGEA (Ingegneria e Geologia Degli Acquiferi ? Groundwater Geoengineering), No. 19, 41-59, ISSN 1121-9041.

Schäfer, G., Elsass, Ph., Jellali, S., Nayagum, D., Ptak, T., Rinck, G. and Zeru, A. (2004): ?Application of the integral pumping test in Strasbourg?, IGEA (Ingegneria e Geologia Degli Acquiferi ? Groundwater Geoengineering), No. 19, 61-72, ISSN 1121-9041.

Riva, M., Guadagnini, L., Martac, E., Ptak, T. (2005): ?Stochastic modeling of well head protection zones in highly heterogeneous aquifers?, in: Groundwater Quality 2004: Bringing Groundwater Quality Research to the Watershed Scale, IAHS Publication 297, 449-457, ISBN 1-901502-18-X.

Ptak, T. (2003): ?New approaches for the quantification of subsurface contamination and aquifer parameters?, Proc. 2nd SENSPOL (European Network on Sensors for Monitoring Water Pollution) Workshop, Response to New Pollution Challenges, King?s College London, UK, 4-7 June 2002, S. Alcock and R. Kadara (eds.), Cranfield University, 180-187, ISBN 1 871315 86 7.

Bockelmann, A., Zamfirescu, D., Ptak, T., Grathwohl, P. and Teutsch, G. (2003): ?Quantification of mass fluxes and natural attenuation rates at an industrial site with a limited monitoring network: a case study?, J. Contam. Hydrol., 60, 97-121, ISSN 0169-7722.

Ptak, T. (2003): ?The integral groundwater investigation method: concepts and principles?, in: 1st IMAGE-TRAIN Advanced Study Course ?Innovative Groundwater Management Technologies?, Prokop, G., Bittens, M., Cofalka, P., Roehl, K. E., Schamann, M. and Younger, P. (eds.), Tübinger Geowissenschaftliche Arbeiten (TGA), C 68, Institut für Geowissenschaften der Universität Tübingen, 30-44, ISSN 0935-4948.

Bayer-Raich, M., Jarsjö, J., Holder, T. and Ptak, T. (2003): ?Numerical estimations of contaminant mass flow rate based on concentration measurements in pumping wells?, ModelCare 2002: A Few Steps Closer to Reality, IAHS Publication No. 277, 10-16, ISBN 1-901502-07-4.

Jarsjö, J., Ptak, T., Bayer-Raich, M. and Holder, T. (2003): ?Uncertainties in contaminant plume characterizations based on concentration measurements in pumping wells: the Stuttgart-Neckartalaue site?, ModelCare 2002: A Few Steps Closer to Reality, IAHS Publication No. 277, 351-358, ISBN 1-901502-07-4.

Martac, E., Sack-Kühner, B., and Ptak, T. (2003): ?Multilevel ? multitracer tests in heterogeneous porous aquifers: A method for subsurface investigation and testing of stochastic models for the delineation of wellhead protection zones?, in: G.J. Annokkée, F. Arendt, O. Uhlmann (Editors), ConSoil 2003, Wissenschaftliche Berichte, FZKA 6943, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 732-739, ISSN 0947-8620.

Ptak, T., Ertel, T. and Teutsch, G. (2003): ?An integral approach for the quantification of subsurface contamination?, in: Contaminated Soil 2003, Thomas Telford, London.

Martac, E., Guadagnini, L., Riva, M. and Ptak, T. (2003): ?Multivariate geostatistical parametrization approach for 3D transient stochastic modeling of wellhead protection zones in a highly heterogeneous aquifer?, in: MODFLOW and MORE 2003 ? Understanding through Modelling, Conference Proceedings, Poeter, Zheng, Hill Doherty, International Ground Water Modeling Center (IGWMC), Colorado School of Mines, www.mines.edu/igwmc/, 686-690.

Ptak, T. (2003): ?Investigation of subsurface contamination using an integral approach?, in: IMAGE-TRAIN, Innovative Management of Groundwater Resources in Europe Training and RTD Coordination Project, Proceedings of the 2nd IMAGE-TRAIN Cluster-Meeting, Cracow, Poland, Prokop, G. (ed.), Federal Environment Agency ? Austria, Vienna, Austria 33 - 40, ISBN 3-85457-694-3.

Liedl, R. und Ptak, T. (2003): ?Modelling of diffusion-limited retardation of contaminants in hydraulically and lithologically non-uniform aquifers?, J. Contam. Hydrol., 66(3-4), 239-259, ISSN 0169-7722.

Bauer, S., Bayer-Raich, M., Holder, T., Jarsjö, J., Ptak, T. and Teutsch, G. (2002): ?The integral groundwater investigation method ? Inversion of concentration-time series and field application at the INCORE Strasbourg site?, in: IMAGE-TRAIN, Innovative Management of Groundwater Resources in Europe Training and RTD Coordination Project, Proceedings of the 1st IMAGE-TRAIN Cluster-Meeting, Karlsruhe, Germany, Prokop, G. (ed.), Federal Environment Agency ? Austria, Vienna, Austria, 75-79, ISBN 3-85457-631-5.

Jarsjö, J., Ptak, T., Bauer, S., Bayer-Raich, M., Holder, T. and Teutsch, G. (2002): ?Evaluation of results from the integral groundwater investigation method: Application in Stuttgart?, in: IMAGE-TRAIN, Innovative Management of Groundwater Resources in Europe Training and RTD Coordination Project, Proceedings of the 1st IMAGE-TRAIN Cluster-Meeting, Karlsruhe, Germany, Prokop, G. (ed.), Federal Environment Agency ? Austria, Vienna, Austria, 87 - 92, ISBN 3-85457-631-5.

Zlotnik, V., Zurbuchen, B., Halihan, T. and Ptak, T. (2002): ?Steady-state dipole flow test: Summary of first ten years?, in: Bridging the Gap between Measurements and Modeling in Heterogeneous Media, International Groundwater Symposium IAHR, IAHS and ASCE/EWRI, March 25-29, 2002 Berkeley, California, Findikakis, A. N. (ed.), IAHR, Madrid, Spain, 251-255 (full paper on accompanying CD-ROM, 8 pages), ISBN 90-805649-4-X.

Ptak, T. and Liedl, R.(2002): ?Modeling of reactive contaminant transport in hydraulically and hydrogeochemically heterogeneous aquifers using an upscaling approach based on sedimentological facies?, in: Bridging the Gap between Measurements and Modeling in Heterogeneous Media, International Groundwater Symposium IAHR, IAHS and ASCE/EWRI, March 25-29, 2002 Berkeley, California, Findikakis, A. N. (ed.), IAHR, Madrid, Spain, 425-429 (full paper on accompanying CD-ROM, 9 pages), ISBN 90-805649-4-X.

Schirmer, M., Dahmke, A., Dietrich, P., Grathwohl, P., Liedl, R., Ptak, T., Richnow, H. H., Schäfer, D., Schirmer, K., Teutsch, G., Weiß, H., Zamfirescu, D. (2002): ?RETZINA (REference Testsite Zeitz for the Implementation of the ?Natural-Attenuation? Concept)?, in: Water Resources and Environment Research, ICWRER 2002, Volume II, Dresden, Germany, G. H. Schmitz (ed.), Schriftenreihe des Institutes für Abfallwirtschaft und Altlasten, Band 28, Eigenverlag des Forums für Abfallwirtschaft und Altlasten e.V., Pirna, 189-192, ISBN 3-934253-18-0.

Bayer-Raich, M., Baumann, R. and Ptak, T. (2002): ?Estimation of contaminant mass flows in a multi-layered aquifer using pumping tests: numerical experiments at field scale?, in: Groundwater Quality: Natural and Enhanced Restoration of Groundwater Pollution, Thornton S.F. and Oswald, S.E. (eds.), IAHS Publication No. 275, IAHS Press, Wallingford, Oxfordshire, UK, ISBN 1-901502-86-4, 257-263.

Piepenbrink, M., Ptak, T. and Grathwohl, P. (2002): ?Natural gradient partitioning and interfacial tracer tests for NAPL source zone characterisation at a former coal gasification plant?, in: Groundwater Quality: Natural and Enhanced Restoration of Groundwater Pollution, Thornton S.F. and Oswald, S.E. (eds.), IAHS Publication No. 275, IAHS Press, Wallingford, Oxfordshire, UK, ISBN 1-901502-86-4, 17-23.

Bockelmann, A., Peter, A., Ptak, T., Liedl, R. and Teutsch, G. (2002): ?Quantifizierung und Simulation des Schadstoffmassenflusses im Feldmassstab?, ?, in: Natural Attenuation ? Umsetzung, Finanzierung, Perspektiven, Dechema e.V. Texte, Dechema, Frankfurt, 83 ? 86, ISBN 3-89746-036-X.

Peter, A., Liedl, R., Ptak, T. and Teutsch, G. (2002): ?Comparing two approaches for modelling natural attenuation of organic compounds in heterogeneous porous media?, ?, in: Geochemical Processes ? Conceptual Models for Reactive Transport in Soil and Groundwater, H. D. Schulz and G. Teutsch (eds.), Wiley-VCH, Weinheim, 242-249, ISBN 3-527-27764-1.

Ptak, T. and Liedl, R. (2002): ?Upscaling of hydraulic and hydrogeochemical aquifer parameters using an approach based on sedimentological facies?, in: Geochemical Processes ? Conceptual Models for Reactive Transport in Soil and Groundwater, H. D. Schulz and G. Teutsch (eds.), Wiley-VCH, Weinheim, 39-54, ISBN 3-527-27764-1.

Piepenbrink, M., Ptak, T., Grathwohl, P. (2002): ?Enhanced multi-level sampling for monitoring of NA processes?, in: Mikrobielles Abbaupotential im Untergrund ? Bedeutung, Erfassung, Bewertung, B. Bilitewski und P. Werner (eds.), Beiträge zu Abfallwirtschaft/Altlasten, Band 29, Schriftenreihe des Instituts für Abfallwirtschaft und Altlasten, Technische Universität Dresden, 19-21, ISBN 3-934253-20-2.

Herfort, M. und Ptak, T. (2002): ?Multitracer-Versuch im kontaminierten Grundwasser des Testfeldes Süd?, Grundwasser 1(7), 31-40.

Bockelmann, A., Ptak, T. and Teutsch, G. (2001): ?Quantifizierung des natürlichen Rückhalte- und Abbaupotentials im Feldmaßstab am Beispiel des Testfelds Süd?, Natural Attenuation ? Neue Erkenntnisse, Konflikte, Anwendungen, Dechema e.V. Texte, 121-128, ISBN 3-89746-021-1.

Ptak, T. and Liedl, R. (2001): ?Modelling of reactive contaminant transport in hydraulically and hydrogeochemically heterogeneous aquifers?, New Approaches to Characterising Groundwater Flow, Seiler, K.-P. and Wohnlich, S. (eds.), Balkema, Lisse (381-384), ISBN 90 2651 849 8.

Herfort, M. and Ptak, T. (2001): ?Interaction of fluorescent dyes and organic contaminants ? laboratory and field experiments?, New Approaches to Characterising Groundwater Flow, Seiler, K.-P. and Wohnlich, S. (eds.), Balkema, Lisse (103-106), ISBN 90 2651 849 8.

Piepenbrink, M., Ptak, T. and Grathwohl, P. (2001): ?Field applicability of Partitioning and Interfacial Tracer Tests for NAPL source zone characterisation at a former coal gasification plant?, New Approaches to Characterising Groundwater Flow, Seiler, K.-P. and Wohnlich, S. (eds.), Balkema, Lisse (159-163), ISBN 90 2651 849 8.

Bayer-Raich, M., Jarsjö, J. and Ptak, T. (2001): ?The Immission approach for quantifying contaminant mass fluxes in heterogeneous formations: numerical simulation and discussion of methodology?, in: Las Caras del Agua Subterranea, Medina, A., Carrera, J. and Vives, L. (eds.), Institut Geologico y Minero de España, Madrid, 863-869, ISBN 84-7840-426-0.

Bockelmann, A., Ptak, T., Liedl, R. and Teutsch, G. (2001): ?Mass flux, transport and natural attenuation of organic contaminants at a former urban gaswork site?, in: Prospects and Limits of Natural Attenuation at Tar Oil Contaminated Sites. Dechema e.V. Texte, 325-336, Dechema e.V. Frankfurt am Main, ISBN 3-89746-029-7.

Peter, A., Liedl, R., Ptak, T. and Teutsch, G. (2001): ?Reactive transport modelling using a control plane based measuring and modelling approach?, in: Prospects and Limits of Natural Attenuation at Tar Oil Contaminated Sites. Dechema e.V. Texte, 389-398, Dechema e.V. Frankfurt am Main, ISBN 3-89746-029-7.

Piepenbrink, M., Ptak, T. and Grathwohl, P. (2001): ?Validation of partitioning and interfacial tracer tests for NAPL source zone characterisation at former gasification plants?, in: Prospects and Limits of Natural Attenuation at Tar Oil Contaminated Sites. Dechema e.V. Texte, 399-406, Dechema e.V. Frankfurt am Main, ISBN 3-89746-029-7.

Béland-Pelletier, C., Barker, J.F., Bockelmann, A., Ptak, T. (2001): ?Evaluation of two techniques to estimate the mass flux of contaminants in groundwater?, 2nd Joint IAH-CNC/CGS Groundwater Specialty Conference, 16-19 September 2001, Calgary, Alberta, Canada.

Zlotnik, V., Zurbuchen, B. and Ptak, T. (2001): ?The steady-state dipole-flow test for characterization of hydraulic conductivity statistics in a highly permeable aquifer: Horkheimer Insel site, Germany?, Groundwater, 39(4), 504-516.

Bockelmann, A., Ptak, T. and Teutsch, G. (2001): ?An analytical quantification of mass fluxes and natural attenuation rate constants at a former gasworks site?, J. Contam. Hydrol., 53(3-4), 429-453, ISSN 0169-7722.

Bösel, D., Herfort, M., Ptak, T. and Teutsch, G. (2000): ?Design, performance, evaluation and modeling of a natural gradient multitracer transport experiment in a contaminated heterogeneous porous aquifer?, in Tracers and Modelling in Hydrogeology, IAHS Publication No. 262, ISBN 1-901502-21-X, 45-51.

Peter, A., Liedl, R., Ptak, T. and Teutsch, G. (2000): ?Comparing approaches for modelling natural attenuation of organic compounds in heterogeneous porous media?, Groundwater Research, Bjerg, P.L., Engesgaard, P. and Krom T.D. (eds.), Balkema, Rotterdam, ISBN 90 5809 133 3, 53-54.

Piepenbrink, M., Eberhardt, C., Ptak, T. and Grathwohl, P. (2000): ?Partitioning and interfacial tracer tests for NAPL source zone characterization at a former gasification plant?, Groundwater Research, Bjerg, P.L., Engesgaard, P. and Krom T.D. (eds.), Balkema, Rotterdam, ISBN 90 5809 133 3, 117-118.

Bockelmann, A., Ptak, T. and Teutsch, G. (2000): ?Field scale quantification of contaminant mass fluxes and natural attenuation rates using an integral investigation approach?, Groundwater Research, Bjerg, P.L., Engesgaard, P. and Krom T.D. (eds.), Balkema, Rotterdam, ISBN 90 5809 133 3, 309-310.

Ptak, T. and Teutsch, G. (2000): ?Development and application of an integral investigation method for the characterization of groundwater contamination?, in: Contaminated Soil 2000, Thomas Telford, London, ISBN 0 7277 2954 3, 198-205.

Bockelmann, A., Peter, A., Ptak, T., Liedl, R. and Teutsch, G. (2000): ?Investigation of natural attenuation rates at field scale?, in: Contaminated Soil 2000, Thomas Telford, London, ISBN 0 7277 2954 3, 478-485.

Teutsch, G., Dietrich, P., Grathwohl, P., Liedl, R., Ptak, T., Zamfirescu, D., Weiß, H.2, Kästner, M., Richnow, H., Schirmer, K., Schirmer, M., Schüürmann, G., Segner, H., Dahmke, A., Bedbur, E., Ebert, M. and Schäfer, D. (2000): ?Reference testsite Zeitz for the implementation of the ?natural-attenuation? concept (RETZINA)?, in: Contaminated Soil 2000, Thomas Telford, London, ISBN 0 7277 2954 3, 1178-1179 (short communication).

Ptak, T., Schirmer, M. and Teutsch, G. (2000): ?Development and performance of a new multilevel groundwater sampling system?, Risk, Regulatory and Monitoring Considerations: Remediation of Chlorinated and Recalcitrant Compounds, Wickramanayake, Godage B., Gavaskar, Arun R., Kelley, Mark E. and Nehring, Karl W. (eds.), Battelle Press, Columbus, Ohio, USA, ISBN 1-57477-095-0, 95-102.

Teutsch, G., Ptak, T., Schwarz, R. und Holder, T. (2000): Ein neues integrales Verfahren zur Quantifizierung der Grundwasserimmission: I. Beschreibung der Grundlagen. Grundwasser 4(5), 170-175.

Ptak, T., Schwarz, R., Holder, T. und Teutsch, G. (2000): ?Ein neues integrales Verfahren zur Quantifizierung der Grundwasserimmission: II. Numerische Lösung und Anwendung in Eppelheim?, Grundwasser 4(5), 176-183.

Herfort, M., Ptak, T., Liedl, R. and Teutsch, G. (2000): ?A new approach for the investigation of natural attenuation at field scale?, Land Contamination and Reclamation, Vol. 8, Part 3, 209-215, ISSN 0967-0513.

Zlotnik, V., Zurbuchen, B., Ptak, T. and Teutsch, G. (2000): ?Support volume and scale effect in hydraulic conductivity: Experimental aspects?, Geological Society of America, Boulder, Colorado, Special Paper 348, in: Zhang, D. and Winter, C.L. (eds.), Theory, Modeling, and Field Investigation in Hydrogeology: A Special Volume in Honor of Shlomo P. Neuman?s 60th Birthday, 215-231, ISBN 0813723485.

Herfort, M., Ptak, T., Liedl, R. and Teutsch, G. (1999): ?A new approach for the investigation of natural attenuation at field scale?, C.D. Johnston (ed.), Proc. of the 1999 Contaminated Site Remediation Conference ?Challenges Posed by Urban & Industrial Contaminants?, Centre for Groundwater Studies, CSIRO Land and Water, Wembley, W.A., Australia, 383-390.

Herfort, M., Ptak, T., Liedl, R. und Teutsch, G. (1999): ?Das Gaswerk Gaisburg als Testfeld eines DFG-Forschungsprojektes?, Schriftenreihe des Amtes für Umweltschutz, Heft 4/1999, Integrale Altlastenerkundung im Neckartal Stuttgart, Landeshauptstadt Stuttgart, Amt für Umweltschutz, 130-152.

Vert, M., Ptak, T., Biver, P. and Vittori, J. (1999): ?Geostatistical generation of three-dimensional aquifer realizations using the conditional SIS approach with direction trends imposed on variogram models?, J. J. Gomez-Hernandez et al. (eds.), geoENV II - Geostatistics for Environmental Applications, Kluwer Academic Publishers, 343-354.

Ptak, T. (1999): "Tracerexperimente zur Erkundung hydraulisch-hydrogeochemischer Eigenschaften heterogener Grundwasserleiter ", Grundwasser, 4(4), 165-175.

Ptak, T. and Strobel, H. (1998): "Sorption of fluorescent tracers in a physically and chemically heterogeneous aquifer material", G.B. Arehart and J.R. Hulston (eds.), Water-Rock Interaction, New Zealand, Balkema, Rotterdam, 177-180.

Ptak, T., Schwarz, R. and Teutsch, G. (1998): "Groundwater risk assessment at a contaminated site based on integrating and spatially resolving investigations of groundwater pollutant concentrations and fluxes", ConSoil98, Sixth International FZK/TNO Conference, 17-21 May 1998, Edinburgh, Great Britain, Thomas Telford, London, 815-816 (short communication).

Ptak, T. (1998): "Modelling of mass transport in heterogeneous porous formations using indicator geostatistics", IAH, International Contributions to Hydrogeology, Volume No. 18, Shallow Groundwater Systems, Balkema, Rotterdam, 129-141 (selected paper).

Teutsch, G. und Ptak, T. (1998): ?Grundwasser-Gefährdungsabschätzung durch Emissions- und Immissionsmessungen an Deponien und Altlasten?, Proceedings des Dresdner Grundwasserforschungszentrums e.V., 6. Dresdner Grundwasserforschungstage, p.29-36, ISSN 1430-0176.

Ptak, T. and Kleiner, K. (1998): "Application of multilevel-multitracer transport experiments for the investigation of hydraulic and hydrogeochemical aquifer properties", in Groundwater Quality: Remediation and Protection, IAHS Publication No. 250, ISSN 0144-7815, 343-351.

Schwarz, R., Ptak, T., Holder, T. and Teutsch, G. (1998): "Groundwater risk assessment at contaminated sites: A new investigation approach", in Groundwater Quality: Remediation and Protection, IAHS Publication No. 250, ISSN 0144-7815, 68-71.

Holder, T., Teutsch, G., Ptak, T. and Schwarz, R. (1998): "A new approach for source zone characterization: The Neckar Valley study", in Groundwater Quality: Remediation and Protection, IAHS Publication No. 250, ISSN 0144-7815, 49-55.

Herfort, M., Ptak, T., Hömmer, O., Teutsch, G. und Dahmke, A. (1998): "Testfeld Shd: Einrichtung der Testfeldinfrastruktur und Erkundung hydraulisch-hydrogeochemischer Parameter des Grundwasserleiters", Grundwasser 3(4), 159-166.

Ptak, T., Teutsch, G. und Schwarz, R. (1998): "Grundwasser-Gefährdungsabschätzung durch Emissions- und Immissionsmessungen an Deponien und Altlasten: Numerische Untersuchungen zur Anwendung und Auswertung", Projekt Wasser-Abfall-Boden, Berichte Umweltforschung Baden-Württemberg 2/1998, Forschungszentrum Karlsruhe.

Ptak, T. (1997): "Evaluation of reactive transport processes in a heterogeneous porous aquifer within a non-parametric numerical stochastic transport modelling framework based on sequential indicator simulation of categorical variables", A. Soares et al. (eds.), geoENV I - Geostatistics for Environmental Applications, Kluwer Academic Publishers, 153-164.

Vert, M., Biver, P. and Ptak, T. (1997): "The use of conservative mass transport analysis as a quick look tool to rank geostatistical realizations of heterogeneous structures", A. Soares et al. (eds.), geoENV I - Geostatistics for Environmental Applications, Kluwer Academic Publishers, 77-87.

Ptak, T. (1997): "Dual-tracer transport experiments in a heterogeneous porous aquifer: Retardation measurements at different scales and non-parametric numerical stochastic transport modelling", A. Kranjc (ed.), Tracer Hydrology 97, Balkema, Rotterdam, 423-430.

Ptak, T. (1997): "Comparison of stochastic simulations of flow and transport in ground-water based on two different hydraulic conductivity data sets", F.M. Holly Jr., A. Alsaffar, Findikakis, A.N. and F. Stauffer (eds.), Groundwater: An Endangered Resource, Proc. of Theme C, Water for a Changing Global Community, XXVII Congress of the International Association of Hydraulic Research (IAHR), ASCE, New York, 222-227.

Ptak, T. (1997): "Evaluation of non-parametric and parametric stochastic simulations of flow and transport in groundwater based on sieve analyses and flowmeter hydraulic conductivity data sets", V. Pawlowsky-Glahn (ed.), Proceedings of IAMG'97, International Association for Mathematical Geology, 22-27 September, 1997, Barcelona, Spain, CIMNE, Barcelona, 842-847.

Ptak, T., Teutsch, G. und Kürner, W. (1997): "Ausbau von Grundwasserme8stellen fhr Multilevel-Grundwasserprobenahme und Flowmetermessungen", Umweltforschungszentrum Leipzig-Halle, UFZ-Bericht Nr. 27/1997, Sanierungsforschung in regional kontaminierten Aquiferen (SAFIRA), ISSN 0948-9452, 34-40.

Ptak, T. (1996): "Evaluation of dual-tracer forced gradient transport experiments in a heterogeneous porous aquifer within a non-parametric numerical stochastic transport modelling framework", in Calibration and Reliability in Groundwater Modelling, IAHS Publication No. 237, 241-252.

Ptak, T., Schad, H., Hofmann, B., Teutsch, G. und Kobus, H. (1996): "Methoden zur Erkundung und zur Simulation von Strömung und Transport in heterogenen Aquiferen", Berichte Umweltforschung Baden-Württemberg, FZKA-PWAB 17, September 1996, ISSN 1432-167X, 152 S.

Ptak, T. and Schmid, G. (1996): "Dual-tracer transport experiments in a physically and chemically heterogeneous porous aquifer: Effective transport parameters and spatial variability, J. Hydrol. , Vol. 183, No. 1-2, 117-138.

Ptak, T. (1995): "Einsatz und Auswertung von Tracerversuchen in heterogenen Grundwasserleitern", Z. dt. geol. Ges., 146, 152-160.

Ptak, T. and Teutsch, G. (1994a): "Forced and natural gradient tracer tests in a highly heterogeneous porous aquifer: Instrumentation and measurements", Journal of Hydrology, Vol. 159, 79-104.

Ptak, T. and Teutsch, G. (1994b): "A comparison of investigation methods for the prediction of flow and transport in highly heterogeneous formations", T.H. Dracos and F. Stauffer (eds.), Transport and Reactive Processes in Aquifers, Balkema, Rotterdam, 157-164.

Ptak, T., Schad, H., Teutsch, G. und Kobus, H. (1994): "Numerisch-stochastische Modellierung von Strömung und Transport zur Validierung von Erkundungsmethoden", Projekt Wasser-Abfall-Boden (PWAB), 4. Statuskolloquium am 21. Februar 1994, KFK-PWAB, Karlsruhe.

Ptak, T. (1993): "Tracerversuche und numerisch-stochastische Transportmodellierung unter Verwendung der sequentiellen Indikatorsimulation", Beiträge zur Mathematischen Geologie und Geoinformatik, Band 5, Verlag Sven von Loga, Knn, 58-68.

Ptak, T. and Teutsch, G. (1992): "Macrodispersivity in highly heterogeneous porous aquifers", H. Hötzl and A. Werner (eds.), Tracer Hydrology, Balkema, Rotterdam, 149-155.

Ptak, T., Schad, H. Teutsch, G., Kobus, H. (1992): "Untersuchungen zur Erkundung effektiver Aquiferparameter", Projekt Wasser-Abfall-Boden (PWAB), 3. Statuskolloquium am 18./19. Februar 1992 in Karlsruhe, KFK-PWAB, Juni 1992, Karlsruhe, 83-100.

Ptak, T. and Teutsch, G. (1991): "Some new hydraulic and tracer measurement techniques for heterogeneous aquifer formations", G. Moltyaner (ed.), Transport and Mass Exchange Processes in Sand and Gravel Aquifers: Field and Modelling Studies, AECL-10308, Ottawa, Canada, Vol. 1, 190-207.

Teutsch, G.; Hofmann, B. und Ptak, T. (1991): "Non-parametric stochastic simulation of groundwater transport processes in highly heterogeneous formations", G. Moltyaner (ed.), Transport and Mass Exchange Processes in Sand and Gravel Aquifers: Field and Modelling Studies, AECL-10308, Ottawa, Canada, Vol. 1, 224-241.

Teutsch, G., Ptak, T., Schad, H. und Decker, H. M. (1990): "Vergleich und Bewertung direkter und indirekter Methoden zur hydrogeologischen Erkundung kleinräumig heterogener Strukturen", Z. dt. geol. Ges., 141, 376-384.

Teutsch, G. and Ptak, T. (1989): "The In-Line-Packer-System: A modular multilevel sampler for collecting undisturbed groundwater samples", Proceedings of the International Symposium on Contaminant Transport in Groundwater, April 4-6, 1989, Stuttgart, West Germany, Balkema Verlag, Rotterdam, 455-456.