http://publicationslist.org/data/thomas.gimmi/atom.xml Thomas Gimmihttp://publicationslist.org/thomas.gimmi$basepathfavicon.icoRecent additions to Thomas Gimmi's PublicationsList.org pagehttp://publicationslist.org/publications.png2021-09-08T08:40:04Z http://publicationslist.org/thomas.gimmi/refid233 2021-09-08T08:35:08Z

During the last two decades, the Mont Terri rock laboratory has hosted an extensive experimental research campaign focusing on improving our understanding of radionuclide transport within Opalinus Clay. The latest diffusion experiment, the Diffusion and Retention experiment B (DR-B) has been designed based on an entirely different concept compared to all predecessor experiments. With its novel exp...<br/><br/>Max Jaquenoud, William T Elam, Tim Grundl, Thomas Gimmi, Andreas Jakob, Senecio Schefer, Veerle Cloet, Pierre De Cannière, Luc R Van Loon, Olivier X Leupin (2021) <i>Chemosphere</i> <i></i> <i></i> 269: 128674<br/>

http://publicationslist.org/thomas.gimmi/refid235 2021-09-08T08:39:29Z

Cation diffusion coefficients in clayey materials partly appear to be greater than diffusion coefficients of water tracers. The measured values vary between experiments performed at different salinities or different tracer concentrations. This effect is especially pronounced for cations that sorb strongly on the clay surfaces, such as Cs. The observations illustrate the difficulties in applying Fi...<br/><br/>Philipp Krejci, Thomas Gimmi, Luc R. Van Loon (2021) <i>Geochimica et Cosmochimica Acta</i> 298: 149-166<br/>

http://publicationslist.org/thomas.gimmi/refid229 2021-01-05T10:10:10Z

Interfaces between cement and clay are common in engineered barrier systems for the underground disposal of radioactive waste. The geochemical contrast between clay and cement leads to alterations of both materials following dissolution and precipitation reactions. Porosity is a key parameter for, and a key outcome of, such reactive transport. Here we report on the evolution of porosity within sma...<br/><br/>A Shafizadeh, T Gimmi, L R Van Loon, A P Kaestner, U K Mäder, S V Churakov (2020) <i>Cement and Concrete Research</i> <i></i> <i></i> 127: 105924<br/>

http://publicationslist.org/thomas.gimmi/refid230 2021-01-05T10:10:23Z

Molecular diffusion of dissolved species is a fundamental mass transport process affecting many environmental and technical processes. Whereas diffusive transport of single tracers can be described by Fick’s law, a multicomponent approach based on the Nernst-Planck equation is required for charge-coupled transport of ions. The numerical solution of the Nernst-Planck equation requires special att...<br/><br/>C Tournassat, C I Steefel, T Gimmi (2020) <i>Water Resources Research</i> <i></i> <i></i> 56: 3 e2019WR026832<br/>

http://publicationslist.org/thomas.gimmi/refid232 2021-01-05T10:10:47Z

Cement and clays are proposed as sealing materials in underground repositories for radioactive waste. When cement and clay come into contact, chemical gradients between their very different porewater compositions lead to diffusive exchange of solutes, which can result in mineral transformations and alterations of transport properties at the materials interface. Small samples of cement-clay interfa...<br/><br/>P Luraschi, T Gimmi, L R Van Loon, A Shafizadeh, S V Churakov (2020) <i>Applied Geochemistry</i> <i></i> <i></i> 119: 104581<br/>

http://publicationslist.org/thomas.gimmi/refid231 2021-01-05T10:10:36Z

Matrix porewater from low permeable Grimsel granodiorite was successfully characterised using indirect methods applied to originally saturated core samples. Core samples were taken from a 17 m long borehole originating from a tunnel of the Grimsel Test Site into the crystalline bedrock intersecting a tectonic shear zone with a water-conducting fracture. Matrix porewater chloride profiles on the me...<br/><br/>F Eichinger, T Gimmi, A Möri, J Rüedi (2020) <i>Applied Geochemistry</i> <i></i> <i></i> 118: 104635<br/>

http://publicationslist.org/thomas.gimmi/refid226 2019-05-20T10:07:25Z

Solute diffusion in compacted clays depends on ionic strength through its control on the thickness of the electrical double layer (EDL) on the charged clay surfaces. In the DR-A field experiment (Mont Terri, Switzerland), synthetic porewater was circulated through a borehole for 189 days, leading to the out-diffusion of a variety of tracers into the Opalinus Clay. The borehole solution was then re...<br/><br/>Josep M Soler, Carl I Steefel, Thomas Gimmi, Olivier X Leupin, Veerle Cloet (2019) <i>ACS Earth and Space Chemistry</i> <i></i> <i></i> 3: 3 442-451<br/>

http://publicationslist.org/thomas.gimmi/refid227 2019-05-20T10:11:57Z

Andreas Gautschi, Irina Gaus, Thomas Gimmi, Martin Mazurek, Paul Wersin, Michel Cathelineau, Adrian Bath (2019) <i>Applied Geochemistry</i> <i></i> <i></i> 105: 127-129<br/>

http://publicationslist.org/thomas.gimmi/refid234 2021-01-05T10:00:03Z

Jenni, A., P. Wersin, T. Thoenen, B. Baeyens, A. Ferrari, T. Gimmi, U. Mäder, P. Marschall, W. Hummel, O. Leupin (2019) NTB 19-03<br/>

http://publicationslist.org/thomas.gimmi/refid228 2019-05-20T10:14:12Z

Molecular diffusion is the dominant solute transport process in clays and claystones that are considered as sealing materials in the deep geological disposal of radioactive waste. These materials are typically water saturated, but during construction and later, at elevated temperatures or when gas may be produced, unsaturated conditions prevail. Investigating the clay's water retention properties ...<br/><br/>Thomas Gimmi, Sergey V Churakov (2019) <i>Applied Clay Science</i> <i></i> <i></i> 175: 169-183<br/>

http://publicationslist.org/thomas.gimmi/refid220 2019-02-26T19:01:11Z

Owing to their low permeability clay formations are considered as potential host rocks for nuclear waste or as seals capping permeable reservoirs for storing unconventional gases. Clay materials such as bentonite are considered as backfill or buffer material in nuclear waste repositories forming barriers to fluid flow owing to their hydraulic and swelling properties. The low permeability of clays ...<br/><br/>Peter Alt-Epping, Thomas Gimmi, Paul Wersin, Andreas Jenni (2018) <i>Applied Geochemistry</i> <i></i> <i></i> 89: 1-10<br/>

http://publicationslist.org/thomas.gimmi/refid219 2019-02-26T19:01:11Z

The pore size distribution of two natural argillaceous rock samples, Opalinus Clay (OPA) and Helvetic Marl (HM) was investigated with five different methods: NMR, NMR cryoporometry, mercury intrusion porosimetry and CO2 adsorption, as well as N-2 adsorption. Due to different physical principles of these methods different ranges of pore width could be detected, from micropores (< 2 nm) to mesopores...<br/><br/>C Wigger, T Gimmi, A Muller, L R Van Loon (2018) <i>Applied Clay Science</i> <i></i> <i></i> 156: 134-143<br/>

http://publicationslist.org/thomas.gimmi/refid222 2019-02-26T19:02:42Z

Understanding ion transport through clays and clay membranes is important for many geochemical and environmental applications. Ion transport is affected by electrostatic forces exerted by charged clay surfaces. Anions are partly excluded from pore water near these surfaces, whereas cations are enriched. Such effects can be modeled by the Donnan approach. Here we introduce a new, comparatively simp...<br/><br/>Thomas Gimmi, Peter Alt-Epping (2018) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>https://doi.org/10.1016/j.gca.2018.04.003, https://authors.elsevier.com/a/1X4M63p4ZCY4W</i> 232: 1-13<br/>

http://publicationslist.org/thomas.gimmi/refid223 2019-02-26T19:01:11Z

Helium concentrations and He-3/He-4 isotope ratios of porewater, groundwater and rock were measured on samples collected from a Jurassic sediment sequence at the Mont Terri underground rock laboratory (Northern Switzerland). Porewater He data of rock samples collected from borehole BDB-1 at high spatial resolution across a karstic limestone unit (Passwang Formation) into the underlying claystone s...<br/><br/>D Rufer, H N Waber, T Gimmi (2018) <i>Applied Geochemistry</i> <i></i> <i></i> 96: 62-77<br/>

http://publicationslist.org/thomas.gimmi/refid225 2019-02-26T19:01:11Z

The suitability of swelling clays as a barrier to isolate nuclear waste in deep geological disposal is based on their microstructure, characterized by pore sizes down to the nanometre scale, and by their physico-chemical properties such as an excellent retention capacity for many radionuclides. A process-based understanding of the key features of radionuclide migration in such environments is requ...<br/><br/>M Bestel, M A Glaus, S Frick, T Gimmi, F Juranyi, L R Van Loon, L W Diamond (2018) <i>Applied Geochemistry</i> <i></i> <i></i> 93: 158-166<br/>

http://publicationslist.org/thomas.gimmi/refid224 2019-02-26T19:01:11Z

Diffusion is the main transport mechanism in many argillaceous formations. In this study, tracer and ion profiles in a 280 m thick clay-rich sequence were simulated by single component and multicomponent diffusion modelling. Drillcores from this sequence originating from a deep borehole in Schlattingen (NE Switzerland) had been previously extensively analysed in terms of porewater chemistry, miner...<br/><br/>P Wersin, T Gimmi, M Mazurek, P Alt-Epping, M Pekala, D Traber (2018) <i>Applied Geochemistry</i> <i></i> <i></i> 95: 110-123<br/>

http://publicationslist.org/thomas.gimmi/refid216 2018-01-09T10:32:42Z

Transport and retardation parameters of radionuclides, which are needed to perform a safety analysis for a deep geological repository for radioactive waste in a compacted claystone such as Opalinus Clay, must be based on a detailed understanding of the mobility of nuclides at different spatial scales (laboratory, field, geological unit). Thanks to steadily improving experimental designs, similar t...<br/><br/>Olivier X Leupin, Luc R Van Loon, Thomas Gimmi, Paul Wersin, Josep M Soler (2017) <i>Swiss Journal of Geosciences</i> <i></i> <i></i> 110: 1 391-403<br/>

http://publicationslist.org/thomas.gimmi/refid217 2018-01-09T10:28:21Z

The development of a combined experimental-modelling approach has enabled to constrain the porewater chemistry of different low-permeability clay formations (Boom Clay, Callovo-Oxfordian Fm., Opalinus Clay) foreseen as host rocks for nuclear waste repositories. A variety of methods are available to directly sample porewater or to derive information on the solute concentrations. These include analy...<br/><br/>P Wersin, D Traber, U K Mader, M Mazurek, H N Waber, D Rufer, T Gimmi, V Cloet (2017) <i></i> <i></i> <i></i> 17: 718-721<br/>

http://publicationslist.org/thomas.gimmi/refid215 2018-01-09T10:32:31Z

Interactions between concrete and clays are driven by the strong chemical gradients in pore water and involve mineral reactions in both materials. In the context of a radioactive waste repository, these reactions may influence safety-relevant clay properties such as swelling pressure, permeability or radionuclide retention. Interfaces between ordinary Portland cement and Opalinus Clay show weaker,...<br/><br/>A Jenni, T Gimmi, P Alt-Epping, U Mader, V Cloet (2017) <i>Physics and Chemistry of the Earth</i> <i></i> <i></i> 99: 22-37<br/>

http://publicationslist.org/thomas.gimmi/refid221 2019-05-20T10:18:37Z

The development of a combined experimental-modelling approach has enabled to constrain the porewater chemistry of different low-permeability clay formations (Boom Clay, Callovo-Oxfordian Fm., Opalinus Clay) foreseen as host rocks for nuclear waste repositories. A variety of methods are available to directly sample porewater or to derive information on the solute concentrations. These include analy...<br/><br/>P Wersin, D Traber, U K Mäder, M Mazurek, H N Waber, D Rufer, T Gimmi, V Cloet (2017) <i>Procedia Earth and Planetary Science</i> <i></i> <i></i> 17: 718-721<br/>

http://publicationslist.org/thomas.gimmi/refid218 2021-01-05T10:00:41Z

Thomas Gimmi, Ana Marìa Fernández (2017) <i></i> <i></i> <i></i> : NAB 16-71 <br/>

http://publicationslist.org/thomas.gimmi/refid213 2016-07-13T11:23:39Z

The geochemistry of an argillaceous rock sequence from a deep borehole in NE-Switzerland was investigated. The focus was to constrain the porewater chemistry in low permeability Jurassic rocks comprising the Liassic, the Opalinus Clay formation, the 'Brown Dogger' unit and the Effingen Member (Malm). A multi-method approach including mineralogical analysis, aqueous and Ni-ethylenediamine extractio...<br/><br/>Paul Wersin, Martin Mazurek, Urs K Mäder, Thomas Gimmi, Daniel Rufer, Catherine Lerouge, Daniel Traber (2016) <i>Chemical Geology</i> <i></i> <i></i> 434: 43-61<br/>

http://publicationslist.org/thomas.gimmi/refid208 2015-11-18T14:09:26Z

Geological site characterisation programmes typically rely on drill cores for direct information on subsurface rocks. However, porosity, transport properties and porewater composition measured on drill cores can deviate from in-situ values due to two main artefacts caused by drilling and sample recovery: (1) mechanical disruption that increases porosity and (2) contamination of the porewater by dr...<br/><br/>D B Meier, H N Waber, T Gimmi, F Eichinger, L W Diamond (2015) <i>Journal of Contaminant Hydrology</i> <i></i> <i></i> 183: 55-71<br/>

http://publicationslist.org/thomas.gimmi/refid207 2015-10-05T12:59:59Z

In many designs for radioactive waste repositories, cement and clay will come into direct contact. The geochemical contrast between cement and clay will lead to mass fluxes across the interface, which consequently results in alteration of structural and transport properties of both materials that may affect the performance of the multi-barrier system. We present an experimental approach to study c...<br/><br/>Shafizadeh A., T. Gimmi, L.R. Van Loon, A. Kaestner, E. Lehmann, U.K. Maeder, S.V. Churakov (2015) <i>Physics Procedia</i> 69: 516-523<br/>

http://publicationslist.org/thomas.gimmi/refid202 2014-08-07T13:54:04Z

Since no single experimental or modeling technique provides data that allow a description of transport processes in clays and clay minerals at all relevant scales, several complementary approaches have to be combined to understand and explain the interplay between transport relevant phenomena. In this paper molecular dynamics simulations (MD) were used to investigate the mobility of water in the i...<br/><br/>Churakov, S.V, T. Gimmi, T. Unruh, L.R. Van Loon, F. Juranyi (2014) <i>Applied Clay Science</i> 96: 36-44<br/>

http://publicationslist.org/thomas.gimmi/refid200 2013-12-15T14:00:15Z

Claystones are considered worldwide as barrier materials for nuclear waste repositories. In the Mont Terri underground research laboratory (URL), a nearly 4-year diffusion and retention (DR) experiment has been performed in Opalinus Clay. It aimed at (1) obtaining data at larger space and time scales than in laboratory experiments and (2) under relevant in situ conditions with respect to pore wate...<br/><br/>T. Gimmi, O.X. Leupin, J. Eikenberg, M.A. Glaus, L.R. Van Loon, H.N. Waber, P. Wersin, H.A.O. Wang, D. Grolimund, C.N. Borca, S. Dewonck, C. Wittebroodt (2014) <i>Geochimica et Cosmochimica Acta</i> 125: 373-393<br/>

http://publicationslist.org/thomas.gimmi/refid201 2013-12-15T14:00:00Z

The chloride and sulfate concentration profiles in a 260 m thick clay-rich Mesozoic sediment sequence have been analyzed by various methods. Chloride data generally indicate a good consistency between different methods if anion exclusion is accounted for in leaching tests. For sulfate, however, there is an apparent inconsistency between leaching data and those obtained from the other methods, whic...<br/><br/>Wersin, P., H. N. Waber, M. Mazurek, U.K. Mäder, T. Gimmi, D. Rufer, D. Traber (2013) <i>Procedia Earth and Planetary Science</i> 7: 892-895<br/>

http://publicationslist.org/thomas.gimmi/refid199 2013-12-18T10:04:07Z

Clays and claystones are used as backfill and barrier materials in the design of waste repositories, because they act as hydraulic barriers and retain contaminants. Transport through such barriers occurs mainly by molecular diffusion. There is thus an interest to relate the diffusion properties of clays to their structural properties. In previous work, we have developed a concept for up-scaling po...<br/><br/>Manav Tyagi, Thomas Gimmi, Sergey V. Churakov (2013) <i>Advances in Water Resources</i> 59: 181–195<br/>

http://publicationslist.org/thomas.gimmi/refid203 2015-02-26T14:43:54Z

Gimmi, T., and H.N. Waber (2013) <br/>

http://publicationslist.org/thomas.gimmi/refid204 2021-01-05T10:01:16Z

Wersin, P., M. Mazurek, H.N. Waber, U.K. Mäder, T. Gimmi, D. Rufer, A. de Haller (2013) <br/>

http://publicationslist.org/thomas.gimmi/refid142 2012-01-10T18:13:57Z

Clay mineral-rich sedimentary formations are currently under investigation to evaluate their potential use as host formations for installation of deep underground disposal facilities for radioactive waste (e.g. Boom Clay (BE), Opalinus Clay (CH), Callovo–Oxfordian argillite (FR)). The ultimate safety of the cor- responding repository concepts depends largely on the capacity of the host formation...<br/><br/>Altmann, S., C. Tournassat, F. Goutelard, J.-C. Parneix, T. Gimmi, and N. Maes (2012) <i>Applied Geochemistry</i> 27: 2 463–478<br/>

http://publicationslist.org/thomas.gimmi/refid198 2013-02-04T08:04:59Z

The interaction between fracture groundwater and crystalline rock matrix was explored by extracting the porewater residing today in the low-permeability, saturated rock matrix. About 100 m below surface, concentrations of the natural tracers Cl-, delta O-18, delta H-2 in the porewater along a 11 m long profile from a water-conducting, fractured deformation zone into the intact rock matrix are the ...<br/><br/>H N Waber, T Gimmi, J A T Smellie (2012) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i></i> 94: 109-127<br/>

http://publicationslist.org/thomas.gimmi/refid197 2015-11-18T14:12:19Z

In situ diffusion experiments are performed in geological formations at underground research laboratories to overcome the limitations of laboratory diffusion experiments and investigate scale effects. Tracer concentrations are monitored at the injection interval during the experiment (dilution data) and measured from host rock samples around the injection interval at the end of the experiment (ove...<br/><br/>Acacia Naves, Javier Samper, Thomas Gimmi (2012) <i>Journal of Contaminant Hydrology</i> <i></i> <i></i> 142: 63-74<br/>

http://publicationslist.org/thomas.gimmi/refid205 2021-01-05T10:02:04Z

Mazurek, M., H.N. Waber, U. Mäder, T. Gimmi, A. De Haller, and M. Koroleva (2012) <br/>

http://publicationslist.org/thomas.gimmi/refid97 2011-10-05T09:20:09Z

Materials with low permeability such as clays are major components in engineered or natural barriers in waste disposal sites. Diffusion of dissolved chemicals through such materials is a relatively slow process that can strongly limit the spreading of contaminants. The macroscopic diffusive transport of chemicals through barrier materials originates from Brownian motion of molecules and ions in th...<br/><br/>Sergey V Churakov, Thomas Gimmi (2011) <i>Journal of Physical Chemistry C</i> <i></i> <i></i> 115: 14 6703-6714<br/>

http://publicationslist.org/thomas.gimmi/refid106 2015-11-18T14:13:37Z

Diffusion of cations and other contaminants through clays is of central interest, because clays and clay rocks are widely considered as barrier materials for waste disposal sites. An intriguing experimental observation has been made in this context: Often, the diffusive flux of cations at trace concentrations is much larger and the retardation smaller than expected based on their sorption coeffici...<br/><br/>T Gimmi, G Kosakowski (2011) <i>Environmental Science & Technology</i> <i></i> <i></i> 45: 4 1443-1449<br/>

http://publicationslist.org/thomas.gimmi/refid137 2011-10-05T09:18:12Z

The experimental verification of matrix diffusion in crystalline rocks largely relies on indirect methods performed in the laboratory. Such methods are prone to perturbations of the rock samples by collection and preparation and therefore the laboratory-derived transport properties and fluid composition might not represent in situ conditions. We investigated the effects induced by the drilling pro...<br/><br/>H N Waber, T Gimmi, J A T Smellie (2011) <i>Journal of Hydrology</i> <i></i> <i></i> 405: 3-4 316-332<br/>

http://publicationslist.org/thomas.gimmi/refid128 2011-10-05T09:19:37Z

Reactive transport modelling was used to simulate solute transport, thermodynamic reactions, ion exchange and biodegradation in the Porewater Chemistry (PC) experiment at the Mont Terri Rock Laboratory. Simulations show that the most important chemical processes controlling the fluid composition within the borehole and the surrounding formation during the experiment are ion exchange, biodegradatio...<br/><br/>Christophe Tournassat, Peter Alt-Epping, Eric C Gaucher, Thomas Gimmi, Olivier X Leupin, Paul Wersin (2011) <i>Applied Geochemistry</i> <i></i> <i></i> 26: 6 1009-1022<br/>

http://publicationslist.org/thomas.gimmi/refid117 2011-10-05T09:18:54Z

Argillaceous formations generally act as aquitards because of their low hydraulic conductivities. This property, together with the large retention capacity of clays for cationic contaminants, has brought argillaceous formations into focus as potential host rocks for the geological disposal of radioactive and other waste. In several countries, programmes are under way to characterise the detailed t...<br/><br/>Martin Mazurek, Peter Alt-Epping, Adrian Bath, Thomas Gimmi, H Niklaus Waber, Stephane Buschaert, Pierre De Canniere, Mieke De Craen, Andreas Gautschi, Sebastien Savoye, Agnes Vinsot, Isabelle Wemaere, Laurent Wouters (2011) <i>Applied Geochemistry</i> <i></i> <i></i> 26: 7 1035-1064<br/>

http://publicationslist.org/thomas.gimmi/refid119 2011-10-05T09:22:56Z

The Opalinus Clay formation in North Switzerland is a potential host rock for a deep underground radioactive waste repository. The distribution of U-238, U-234 and Th-230 was studied in rock samples of the Opalinus Clay from an exploratory borehole at Benken (Canton of Zurich) using MC-ICP-MS. The aim of U-234 was to assess the in situ, long-term migration behaviour in this rock. Very low hydrauli...<br/><br/>M Pekala, J D Kramers, H N Waber, T Gimmi, P Alt-Epping (2009) <i>Applied Geochemistry</i> <i></i> <i></i> 24: 1 138-152<br/>

http://publicationslist.org/thomas.gimmi/refid121 2015-11-18T14:14:29Z

Diffusion of water and solutes through compacted clays or claystones is important when assessing the barrier function of engineered or geological barriers in waste disposal. The shape and the connectivity of the pore network as well as electrostatic interactions between the diffusant and the charged clay surfaces or cations compensating negative surface charges affect the resistance of the porous ...<br/><br/>F González Sánchez, T Gimmi, F Juranyi, L Van Loon, L W Diamond (2009) <i>Environmental Science & Technology</i> <i></i> <i></i> 43: 10 3487-3493<br/>

http://publicationslist.org/thomas.gimmi/refid115 2011-09-28T08:57:23Z

U Mader, T Gimmi (2009) <i>Geochimica Et Cosmochimica Acta</i> <i></i> <i>Geochimica Et Cosmochimica Acta, 73, A813</i> 73: 13 <br/>

http://publicationslist.org/thomas.gimmi/refid152 2011-10-04T09:02:09Z

Altmann, S., Ch. Tournassat, F. Goutelard, J.C. Parneix, T. Gimmi, N. Maes, P. Reiller (2009) <i>Euradwaste '08, Proceedings of the Seventh European Commission Conference on the Management and Disposal of Radioactive Waste</i> 309-325<br/>

http://publicationslist.org/thomas.gimmi/refid161 2011-10-04T12:12:20Z

Waber, H.N., Th. Gimmi, A. de Haller, and J.A.T. Smellie (2009) <i>SKB Report R-08-112, Stockholm, Sweden, ISSN 1402-3091, 99 pages</i> <br/>

http://publicationslist.org/thomas.gimmi/refid160 2011-10-04T12:10:31Z

Waber, H.N., Th. Gimmi, and J.A.T. Smellie (2009) <i>SKB Report R-08-105, Stockholm, Sweden, ISSN 1402-3091 , 115 pages</i> <br/>

http://publicationslist.org/thomas.gimmi/refid162 2011-10-04T12:00:59Z

Mazurek, M., Alt-Epping, P., Bath, A, Gimmi, Th., & Waber, H.N. (2009) <i>NEA Report #06253, OECD Publishing, ISBN: 9789264060470, 362 pages</i> <br/>

http://publicationslist.org/thomas.gimmi/refid114 2011-09-28T09:01:41Z

O X Leupin, S Dewonck, S Savoye, P Wersin, L R Van Loon, T Gimmi, J Samper, J M Soler, J Eikenberg, B Baeyens (2008) <i>Geochimica Et Cosmochimica Acta</i> <i></i> <i>Geochimica Et Cosmochimica Acta, 72, A537</i> 72: 12 <br/>

http://publicationslist.org/thomas.gimmi/refid139 2011-10-05T09:26:52Z

The migration of radioactive and chemical contaminants in clay materials and argillaceous host rocks is characterised by diffusion and retention processes. Valuable information on such processes can be gained by combining diffusion studies at laboratory scale with field migration tests. In this work, the outcome of a multi-tracer in situ migration test performed in the Opalinus Clay formation in t...<br/><br/>P Wersin, J M Soler, L Van Loon, J Eikenberg, B Baeyens, D Grolimund, T Gimmi, S Dewonck (2008) <i>Applied Geochemistry</i> <i></i> <i></i> 23: 4 678-691<br/>

http://publicationslist.org/thomas.gimmi/refid141 2011-10-05T09:27:30Z

Argillaceous rocks are considered in Switzerland and in other countries as potential host rocks for the deep geologic disposal of radioactive waste. Opalinus Clay, a formation of Jurassic age, is at present the most favored candidate in Switzerland. It has a low hydraulic conductivity, no or only few active fractures, and a large retention capacity for sorbing solutes, which make this sediment wel...<br/><br/>Thomas Gimmi (2008) <i>Journal of Environmental Science for Sustainable Society</i> 2: 63-70<br/>

http://publicationslist.org/thomas.gimmi/refid122 2011-10-05T09:25:05Z

The freezing behavior of water confined in compacted charged and uncharged clays (montmorillonite in Na-and Ca-forms, illite in Na-and Ca-forms, kaolinite and pyrophyllite) was investigated by neutron scattering. Firstly, the amount of frozen (immobile) water was measured as a function of temperature at the IN16 backscattering spectrometer, Institute Laue-Langevin (ILL). Water in uncharged, partly...<br/><br/>F González Sánchez, F Juranyi, T Gimmi, L Van Loon, T Seydel, T Unruh (2008) <i>Journal of Physics-condensed Matter</i> <i></i> <i></i> 20: 41 <br/>

http://publicationslist.org/thomas.gimmi/refid124 2011-10-05T09:26:25Z

The effect of temperature and ionic strength on the diffusion of HTO parallel to the direction of compaction through 5 highly compacted clay minerals (bulk dry density, P-b.d = 1.90 +/- 0.05 Mg/m(3)), namely montmorillonite (Na- and Ca-form), illite (Na- and Ca-form), and kaolinite, was studied. The diffusion experiments were carried out at temperatures between 0 degrees C and 60 degrees C and at ...<br/><br/>F González Sánchez, L R Van Loon, T Gimmi, A Jakob, M A Glaus, L W Diamond (2008) <i>Applied Geochemistry</i> <i></i> <i></i> 23: 12 3840-3851<br/>

http://publicationslist.org/thomas.gimmi/refid123 2015-11-18T14:15:27Z

The water diffusion in four different, highly compacted clays [montmorillonite in the Na- and Ca-forms, illite in the Na- and Ca-forms, kaolinite, and pyrophyllite (bulk dry density rho(b)=1.85 +/- 0.05 g/cm(3))] was studied at the atomic level by means of quasielastic neutron scattering. The experiments were performed on two time-of-flight spectrometers and at three different energy resolutions [...<br/><br/>F González Sánchez, F Juranyi, T Gimmi, L Van Loon, T Unruh, L W Diamond (2008) <i>Journal of Chemical Physics</i> <i></i> <i></i> 129: 17 <br/>

http://publicationslist.org/thomas.gimmi/refid112 2011-10-05T09:28:47Z

The translational diffusion of water in compacted clays at a high hydration level has been investigated by quasielastic neutron scattering at a time-of-flight spectrometer FOCUS (SINQ). Four compacted clays with systematic structural differences have been studied: Na-montmorillonite, Na-illite, kaolinite and pyrophyllite. The QENS experiments were performed using two different incident wavelengths...<br/><br/>F González, F Juranyi, L Van Loon, T Gimmi (2007) <i>European Physical Journal-special Topics</i> <i></i> <i></i> 141: 65-68<br/>

http://publicationslist.org/thomas.gimmi/refid149 2011-10-04T08:15:55Z

Mazurek, M., Alt-Epping, P., Gimmi, T., Waber, H. N., Bath, A., Buschaert, S. & Gautschi, A. (2007) <i>Proceedings of the 12th international symposium on water-rock interaction, WRI-12, Kunming, China, 31 July - 5 August 2007</i> 767-771<br/>

http://publicationslist.org/thomas.gimmi/refid111 2011-10-05T09:28:20Z

[ 1] In order to characterize the large-scale transport properties of the Opalinus Clay formation, the pore water isotope composition (delta O-18 and delta H-2) was determined on samples from the deep borehole Benken ( northeastern Switzerland) across Jurassic argillaceous rocks. The sequence of claystones and marls, delimited by two aquifers, is located at depth from about 400 to 700 m and exhibi...<br/><br/>T Gimmi, H N Waber, A Gautschi, A Rubel (2007) <i>Water Resources Research</i> <i></i> <i></i> 43: 4 <br/>

http://publicationslist.org/thomas.gimmi/refid138 2011-09-28T09:03:05Z

H N Waber, T Gimmi, J A T Smellie (2007) <i>Geochimica Et Cosmochimica Acta</i> <i></i> <i>Geochimica Et Cosmochimica Acta, 71, A1076</i> 71: 15 <br/>

http://publicationslist.org/thomas.gimmi/refid126 2011-10-04T12:00:33Z

J M Soler, Th. Gimmi, A Cartalade (2005) <i></i> <i></i> <i>In: Wersin, P., B. Baeyens, P. Bossart, A. Cartalade, S. Dewonck, J. Eikenberg, T. Fierz, H.R. Fisch, Th. Gimmi, D. Grolimund, P. Hernán, A. Möri, S. Savyoe, J. Soler, F. van Dorp, and L. Van Loon. Long-term Diffusion Experiment (DI-A), Diffusion of HTO, I - , 22Na+ and Cs+: Field activities, data and modelling. Mont Terri Technical Report 2003-06</i> : <br/>

http://publicationslist.org/thomas.gimmi/refid116 2011-10-05T09:29:45Z

The Opalinus Clay in Northern Switzerland has been identified as a potential host rock formation for the disposal of radioactive waste. Comprehensive understanding of gas transport processes through this low-permeability formation forms a key issue in the assessment of repository performance. Field investigations and laboratory experiments suggest an intrinsic permeability of the Opalinus Clay in ...<br/><br/>P Marschall, S Horseman, T Gimmi (2005) <i>OIL & GAS SCIENCE AND TECHNOLOGY-REVUE DE L INSTITUT FRANCAIS DU PETROLE</i> <i></i> <i></i> 60: 1 121-139<br/>

http://publicationslist.org/thomas.gimmi/refid127 2012-01-10T18:17:40Z

J M Soler, Thomas Gimmi, Alain Cartalade, Paul Wersin, Luc R Van Loon (2005) <i>Geochimica et Cosmochimica Acta</i> <i></i> <i>Geochimica et Cosmochimica Acta, 69, A175</i> 69: 10, Suppl. <br/>

http://publicationslist.org/thomas.gimmi/refid151 2011-10-04T08:59:02Z

M Mazurek, A Gautschi, T Gimmi, W Leu, P Marschall, W H Müller, H Naef, N H Waber (2004) <i>GEOLOGICAL DISPOSAL : BUILDING CONFIDENCE USING MULTIPLE LINES OF EVIDENCE</i> <i>Geological Disposal: Building Confidence using Multiple Lines of Evidence, Proc. First AMIGO Workshop, Yverdon-les Bains, Switzerland, 3-5 June 2003</i> <i></i> : 79-85<br/>

http://publicationslist.org/thomas.gimmi/refid108 2011-10-04T09:41:04Z

Water flow and solute transport through soils are strongly influenced by the spatial arrangement of soil materials with different hydraulic and chemical properties. Knowing the specific or statistical arrangement of these materials is considered as a key toward improved predictions of solute transport. Our aim was to obtain two-dimensional material maps from photographs of exposed profiles. We dev...<br/><br/>T Gimmi, N Ursino (2004) <i>SOIL SCIENCE SOCIETY OF AMERICA JOURNAL</i> <i></i> <i></i> 68: 5 1508-1514<br/>

http://publicationslist.org/thomas.gimmi/refid150 2011-10-04T08:56:18Z

A Gautschi, P Marschall, B Schwyn, P Wersin, B Baeyens, M H Bradbury, T Gimmi, M Mazurek, L R Van Loon, N H Waber (2004) <i>GEOLOGICAL DISPOSAL : BUILDING CONFIDENCE USING MULTIPLE LINES OF EVIDENCE</i> <i>Geological Disposal: Building Confidence using Multiple Lines of Evidence, Proc. First AMIGO Workshop, Yverdon-les Bains, Switzerland, 3-5 June 2003</i> <i></i> : 63-70<br/>

http://publicationslist.org/thomas.gimmi/refid146 2011-09-29T15:08:24Z

Mazurek, M., Gimmi, T., Waber, H. N. & Gautschi, A. (2004) <i>Stability and buffering capacity of the geosphere for long term isolation of radioactive waste: Application to argillaceous media, Proc. OECD/NEA workshop</i> 139 - 146<br/>

http://publicationslist.org/thomas.gimmi/refid140 2011-10-04T09:46:22Z

The diffusion of radionuclides is an important safety aspect for nuclear waste disposal in argillaceous host rocks. A long-term diffusion experiment, termed DI-A, is being carried out at the Mont Terri Rock Laboratory in the Opalinus Clay formation. The aim of this experiment is the understanding of the migration and sorption behaviour of cationic and anionic species in consolidated clays. This st...<br/><br/>P Wersin, L R Van Loon, J M Soler, A Yllera, J Eikenberg, T Gimmi, P Hernan, J Y Boisson (2004) <i>Applied Clay Science</i> <i></i> <i></i> 26: 1-4 123-135<br/>

http://publicationslist.org/thomas.gimmi/refid158 2015-02-26T14:59:48Z

Th. Gimmi (2004) <i>Schriftenreihe Umwelt Nr. 349. Bundesamt für Umwelt, Wald und Landschaft, Bern. 46 S</i><br/>

http://publicationslist.org/thomas.gimmi/refid129 2011-10-04T09:42:21Z

[1] Natural soil profiles may be interpreted as an arrangement of parts which are characterized by properties like hydraulic conductivity and water retention function. These parts form a complicated structure. Characterizing the soil structure is fundamental in subsurface hydrology because it has a crucial influence on flow and transport and defines the patterns of many ecological processes. We ap...<br/><br/>N Ursino, T Gimmi (2004) <i>Water Resources Research</i> <i></i> <i>http://www.geoscienceworld.org/cgi/georef/georef;2005072928</i> 40: 1 <br/>

http://publicationslist.org/thomas.gimmi/refid110 2011-10-04T12:01:37Z

Th. Gimmi, H N Waber (2004) <i></i> <i></i> <i>Nagra Technical Report, NTB 04-05, Nagra, Wettingen, Switzerland</i> : <br/>

http://publicationslist.org/thomas.gimmi/refid136 2011-10-04T09:45:54Z

The diffusion properties of the Opalinus Clay were studied in the underground research laboratory at Mont Terri (Canton Jura, Switzerland) and the results were compared with diffusion data measured in the laboratory on small-scale samples. The diffusion of HTO, Na-22(+), Cs+ and I- were investigated for a period of 10 months. The diffusion equipment used in the field experiment was designed in suc...<br/><br/>L R Van Loon, P Wersin, J M Soler, J Eikenberg, T Gimmi, P Hernan, S Dewonck, S Savoye (2004) <i>Radiochimica Acta</i> <i></i> <i></i> 92: 9-11 757-763<br/>

http://publicationslist.org/thomas.gimmi/refid95 2011-09-28T09:05:58Z

D Arcos, L Duro, T Gimmi, H N Waber (2004) <i>Proceedings - International Symposium on Water-Rock Interaction</i> <i>Proceedings - International Symposium on Water-Rock Interaction, 11</i> <i>http://www.geoscienceworld.org/cgi/georef/georef;2007026992</i> 11: 337-341<br/>

http://publicationslist.org/thomas.gimmi/refid159 2011-10-04T12:07:04Z

Adrian Bath, Andreas Gautschi, Thomas Gimmi, F. Joe Pearson, André Rübel (2003) <i>Mont Terri Project: Geochemistry of water in the Opalinus Clay Formation at the Mont Terri Rock Laboratory. Berichte des BWG, Serie Geologie, 5</i> <i>In: Pearson, F.J., D. Arcos, A. Bath, J.-Y. Boisson, A.-M. Fernandez, H.-E. Gaebler, E.C. Gaucher, A. Gautschi, L. Griffault, P. Hernan, and H.N. Waber. Mont Terri Project: Geochemistry of water in the Opalinus Clay Formation at the Mont Terri Rock Laboratory. Berichte des BWG, Serie Geologie 5, p. 105-118.</i> 105-118<br/>

http://publicationslist.org/thomas.gimmi/refid98 2011-12-09T14:57:26Z

M Flury, Th. Gimmi (2002) <i></i> <i>Methods of soil analysis, Part 4—Physical methods</i> <i></i> : 1323-1351<br/>

http://publicationslist.org/thomas.gimmi/refid132 2011-10-04T09:46:55Z

Field soils show rather different spreading behavior at different water saturations, frequently caused by layering of the soil material. We performed tracer experiments in a laboratory sand tank. Such experiments complement and help comprehension of field investigations. We estimated, by image analysis, the first two moments of small plumes traveling through a two-dimensional, heterogeneous medium...<br/><br/>N Ursino, T Gimmi, H Flühler (2001) <i>Water Resources Research</i> <i></i> <i>http://www.geoscienceworld.org/cgi/georef/georef;2001034676</i> 37: 2 201-208<br/>

http://publicationslist.org/thomas.gimmi/refid133 2011-10-04T09:47:29Z

Based on a dye tracer experiment in a sand tank we addressed the problem of local dispersion of conservative tracers in the unsaturated zone. The sand bedding was designed to have a defined spatial heterogeneity with a strong anisotropy. We estimated the parameters that characterize the local dispersion and dilution from concentration maps of a high spatial and temporal resolution obtained by imag...<br/><br/>N Ursino, T Gimmi, H Flühler (2001) <i>ADVANCES IN WATER RESOURCES</i> <i></i> <i></i> 24: 8 877-885<br/>

http://publicationslist.org/thomas.gimmi/refid103 2011-09-28T09:10:31Z

Thomas Gimmi, Hannes FlüŸhler (2000) <i>Mitteilungen des Instituts fuer Wasserbau und Wasserwirtschaft der Technischen Hochschule Darmstadt</i> <i></i> <i>http://www.geoscienceworld.org/cgi/georef/georef;3357375006</i> 111: 41-46<br/>

http://publicationslist.org/thomas.gimmi/refid131 2011-09-29T11:18:02Z

N Ursino, T Gimmi, H Flühler (2000) <i>Geophysical Research Abstracts</i> <i></i> <i>Geophysical Research Abstracts, 2, http://www.geoscienceworld.org/cgi/georef/georef;2007037660</i> 2: <br/>

http://publicationslist.org/thomas.gimmi/refid135 2011-10-04T09:47:58Z

Geological and pedological processes rarely form isotropic media as is usually assumed in transport studies. Anisotropy at the Darcy or field scale may be detected directly by measuring flow parameters or may become indirectly evident from movement and shape of solute plumes. Anisotropic behavior of a soil at one scale may, in many cases, be related to the presence of lower-scale directional struc...<br/><br/>N Ursino, K Roth, T Gimmi, H Flühler (2000) <i>WATER RESOURCES RESEARCH</i> <i></i> <i></i> 36: 2 421-430<br/>

http://publicationslist.org/thomas.gimmi/refid109 2016-07-14T10:00:12Z

T Gimmi, N Ursino, Hannes Flühler (1999) <i></i> <i>Proceedings of the International Workshop on Modelling of Transport Processes in Soils at Various Scales in Time and Space, Leuven, Belgium</i> <i>http://www.geoscienceworld.org/cgi/georef/georef;2000079577</i> : 164-173<br/>

http://publicationslist.org/thomas.gimmi/refid130 2016-07-14T09:59:50Z

N Ursino, T Gimmi, Hannes Flühler (1999) <i></i> <i>Proceedings of the International Workshop on Modeling of Transport Processes in Soils at Various Scales in Time and Space, Leuven, Belgium</i> <i>http://www.geoscienceworld.org/cgi/georef/georef;2000079578</i> : 174-183<br/>

http://publicationslist.org/thomas.gimmi/refid104 2011-10-04T09:48:44Z

In many field or laboratory situations, well-mixed reservoirs like, for instance, injection or detection wells and gas distribution or sampling chambers define boundaries of transport domains. Exchange of solutes or gases across such boundaries can occur through advective or diffusive processes. First we analyzed situations, where the inlet region consists of a well-mixed reservoir, in a systemati...<br/><br/>T Gimmi, H FlüŸhler (1998) <i>JOURNAL OF CONTAMINANT HYDROLOGY</i> <i></i> <i></i> 33: 1-2 101-131<br/>

http://publicationslist.org/thomas.gimmi/refid99 2011-09-28T09:12:00Z

Markus Flury, Thomas Gimmi (1998) <i>Eos, Transactions, American Geophysical Union</i> <i></i> <i>Eos, Transactions, American Geophysical Union 79, 45, Suppl., http://www.geoscienceworld.org/cgi/georef/georef;2006013389</i> 79: 45, Suppl. <br/>

http://publicationslist.org/thomas.gimmi/refid134 2011-09-28T09:13:03Z

Nadia Ursino, Kurt Roth, Thomas Gimmi, Hannes Flühler (1998) <i>Eos, Transactions, American Geophysical Union</i> <i></i> <i>Eos, Transactions, American Geophysical Union 79, 45, Suppl., http://www.geoscienceworld.org/cgi/georef/georef;2005024270</i> 79: 45, Suppl. <br/>

http://publicationslist.org/thomas.gimmi/refid145 2011-09-29T15:01:31Z

T. Gimmi, R. Kretzschmar, A. Papritz, and H. Flühler (1997) <i>Mitteilungen der Deutschen Bodenkundlichen Gesellschaft</i> 82: 169-186<br/>

http://publicationslist.org/thomas.gimmi/refid107 2011-10-04T09:49:09Z

Safe disposal of toxic wastes in geologic formations requires minimal water and gas movement in the vicinity of storage areas, Ventilation of repository tunnels or caverns built in solid rock can desaturate the near field up to a distance of meters from the rock surface, even when the surrounding geological formation is saturated and under hydrostatic pressures. A tunnel segment at the Grimsel tes...<br/><br/>T Gimmi, M Schneebeli, H FlüŸhler, H Wydler, T Baer (1997) <i>WATER RESOURCES RESEARCH</i> <i></i> <i></i> 33: 4 589-598<br/>

http://publicationslist.org/thomas.gimmi/refid113 2011-09-28T08:30:45Z

A model is developed to describe transport and loss of methyl bromide (MeBr) in soil following application as a soil fumigant. The model is used to investigate the effect of soil and management factors on MeBr volatilization. Factors studied include depth of injection, soil water content, presence or absence of tarp, depth to downward barrier, and irrigation after injection. Of these factors, the ...<br/><br/>W A Jury, Y Jin, J Y Gan, T Gimmi (1997) <i>FUMIGANTS</i> <i></i> <i></i> 652: 104-115<br/>

http://publicationslist.org/thomas.gimmi/refid105 2011-10-04T09:50:14Z

The occurrence of gaseous pollutants in soils has stimulated many experimental activities, including forced ventilation in the field as well as laboratory transport experiments with gases. The dispersion coefficient in advective-dispersive gas phase transport is often dominated by molecular diffusion, which leads to a large overall dispersivity gamma. Under such conditions it is important to disti...<br/><br/>T Gimmi, H FlüŸhler (1996) <i>WATER RESOURCES RESEARCH</i> <i></i> <i></i> 32: 1 1-7<br/>

http://publicationslist.org/thomas.gimmi/refid125 2011-10-04T09:50:39Z

A water desaturation zone develops around a tunnel in water-saturated rock when the evaporative water loss at the rock surface is larger than the water flow from the surrounding saturated region of restricted permeability. We describe the methods with which such water desaturation processes in rock materials can be quantified. The water retention characteristic theta(psi) of crystalline rock sampl...<br/><br/>Martin Schneebeli, Hannes Flühler, Thomas Gimmi, Hannes Wydler, Hans-Peter Laeser, Toni Baer (1995) <i>Water Resources Research</i> <i></i> <i>http://www.geoscienceworld.org/cgi/georef/georef;1997006692</i> 31: 8 1837-1843<br/>

http://publicationslist.org/thomas.gimmi/refid206 2015-02-26T15:00:22Z

Th. Gimmi, M. Schneebeli, H. Flühler, H. Wydler, T. Baer, H.-P. Läser, M. Malicki, and R. Walczak (1994) <br/>

http://publicationslist.org/thomas.gimmi/refid102 2011-10-04T09:51:58Z

Transport of volatile hydrocarbons in soils is largely controlled by interactions of vapours with the liquid and solid phase. Sorption on solids of gaseous or dissolved comPounds may be important. Since the contact time between a chemical and a specific sorption site can be rather short, kinetic or mass-transfer resistance effects may be relevant. An existing mathematical model describing advectio...<br/><br/>T Gimmi, H Flühler, B Studer, A Rasmuson (1993) <i>Water, Air and Soil Pollution</i> <i></i> <i>http://www.geoscienceworld.org/cgi/georef/georef;1994003682</i> 68: 1-2 291-305<br/>

http://publicationslist.org/thomas.gimmi/refid144 2011-09-29T11:28:58Z

H. Flühler, Roth K., Flury M., Papritz A., Buchter B., Gimmi T., Koch S. (1992) <i>Vermessung-Photogrammetrie-Kulturtechnik</i> 8: 430-433 <br/>

http://publicationslist.org/thomas.gimmi/refid101 2011-09-28T08:30:45Z

Thomas Gimmi (1991) <i>Mitteilungen der Deutschen Bodenkundlichen Gesellschaft</i> <i></i> <i>http://www.geoscienceworld.org/cgi/georef/georef;3038026018</i> 63: 111-114<br/>

http://publicationslist.org/thomas.gimmi/refid120 2011-10-04T09:53:41Z

A Rasmuson, T Gimmi, H Flühler (1990) <i>SOIL SCIENCE SOCIETY OF AMERICA JOURNAL</i> <i></i> <i></i> 54: 5 1206-1213<br/>

http://publicationslist.org/thomas.gimmi/refid157 2015-02-10T15:05:42Z

A RASMUSON, H FLUHLER, T ADDISCOTT, G DAGAN, T GIMMI, P HUFSCHMIED, D IMBODEN, S KOCH, G KACHANOWSKI, G KARLAGANIS, P LACHASSAGNE, DO LOMEN, PSC RAO, B SAGAR, RE WHITE, P WIERENGA, JHM WOSTEN (1990) <i>FIELD-SCALE WATER AND SOLUTE FLUX IN SOILS</i> <i>FIELD-SCALE WATER AND SOLUTE FLUX IN SOILS</i> <i></i> : 4-11<br/>