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Centre d'hydrogéologie et de géothermie
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Site web
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+ 41 32 718 26 00 / 02
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+ 41 32 718 26 03
Rue
Rue Emile-Argand 11
Code postal
2000
Ville
Neuchâtel
Pays
CH
Type d'institution
Academic Institute
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1045 Résultats
Voici les éléments 1 - 10 sur 1045
- PublicationMétadonnées seulementComplementing approaches to demonstrate chlorinated solvent biodegradation in a complex pollution plume: Mass balance, PCR and compound-specific stable isotope analysis(2011)
;Courbet, C. ;Rivière, A. ;Jeannottat, S. ;Rinaldi, S.; ;Bendjoudi, H.De Marsily, G. - PublicationMétadonnées seulementCoupling of full two-dimensional and depth-averaged models for granular flows(2013)
;Domnik, Birte ;Pudasaini, Shiva P. ;Katzenbach, Rolf - PublicationMétadonnées seulementNachhaltige Grundwasserwirtschaft: Probleme und wissenschaftliche Werkzeuge(2003)
;Kinzelbach, Wolfgang ;Bauer, Peter ;Siegfried, T - PublicationMétadonnées seulementStress Characterisation and stress modeling at the Grimsel Test Site for the In-situ Stimulation and Circulation Project(2016-11-19)
; ; ;Krietsch, Hannes ;Amann, Florian ;Gischig, ValentinEvans, Keith F. - PublicationMétadonnées seulementLe forage géothermique de Thonex (Canton de Genève): Aspects stratigraphiques, tectoniques, diagénéitiques, géophysiques et hydrogéologiques(1995)
;Jenny, Jacques ;Burri, Jean-Paul ;Muralt, Reto ;Pugin, André ;Schegg, Roland ;Ungemach, Pierre; Wemli, Roland - PublicationAccès libreA comparison of FBG- and Brillouin-strain sensing in the framework of a decameter-scale hydraulic stimulation experiment(: American Rock Mechanics Association, 2018-6-18)
;Krietsch, H. ;Gischig, V. ;Jalali, R. ;Doetsch, J.; Amann, F.In the framework of the In-situ Stimulation and Circulation (ISC) experiment Fiber-Bragg-Grating (FBG) and Brillouin strain sensing systems were installed to monitor deformation during six hydraulic shearing and six hydraulic fracturing experiments. Three boreholes were dedicated to strain monitoring. Both systems are installed in the same boreholes, offering a unique opportunity to compare these systems with respect to their applicability in hydraulic stimulation tests. A total of 60 FBG sensors with 1 m base length were installed across fractures, shear zones and intact rock. Along the entire borehole length, pre-stressed optical cables for Brillouin distributed strain (DBS) sensing were embedded in grout with two installation methods: a bare cable and a cable packed and fixed with glue every 0.65 m. The strain signals were compared as time series for a given borehole depth and as profiles along the borehole axis. The study reveals that the FBG system gives a high accuracy (0.04 µ-strain) and temporal resolution (>1s) with pointwise measurements. The bare DBS leg yield good quantitative strain data with poorer strain accuracy (>500 times poorer than FBG) and poorer temporal resolution (factor of >100). The packed DBS leg provide no meaningful information about the strain field. - PublicationMétadonnées seulementCarbon isotopes as a tool to evaluate the origin and fate of vinyl chloride: Laboratory experiments and modeling of isotope evolution(2002)
; ;Aravena, RamonCox, EvanAccumulation of vinyl chloride (VC) is often a main concern at sites contaminated with chlorinated ethenes and ethanes due to its high toxicity. Since there can be several possible sources of VC and ethene at such sites, assessing the origin and fate of VC can be complicated. Aim of this study was to evaluate carbon isotope fractionation associated with various anaerobic processes that lead to the production of VC and ethene in view of using isotopes to evaluate the origin and fate of these compounds in groundwater. Microcosms were constructed using sediments and groundwater from a contaminated site and amended with potential precursors for VC and ethene production. In the microcosms with dichloroethene isomers, sequential reductive dechlorination was observed, and isotopic enrichment factors of -19.9+/-1.5%,for cis- 1,2-dichloroethene -30.3+/-1.9%o for trans-1,2-dichloroethene, and -7.3+/-0.4%o for 1,1,1-dichloroethene were obtained. In microcosms with chlorinated ethanes, 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethane (1,1,2-TCA) were predominantly transformed by dichloroelimination to ethene and VC, respectively, and enrichment factors of -32.1+/-1.1%o for 1,2-DCA and -2.0+/-0.2%o for 1,1,2-TCA were observed. Except for 1,1,2-TCA, a strong C-13 enrichment in each of the potential precursor of VC was observed, which opens the possibility to trace the origin of VC based on the isotope ratio of potential precursors, Furthermore, it was possible to model the isotope evolution of VC present as substrate or intermediate product as a function of time. The study demonstrates that carbon isotope ratios can potentially be used for qualitative and possibly quantitative evaluation of the origin and fate of VC at sites with complex contaminant mixtures. - PublicationMétadonnées seulementRegional Flow Simulation in Fractured Aquifers Using Stress?Dependent Parameters(2012)
; ;Cornaton, Fabien Joel - PublicationMétadonnées seulement
- PublicationMétadonnées seulementThe use of the ASTER sensor for soil salinity assement (In chinese)(2006)
;Li, Haitao; ;Li, W P ;Kinzelbach, WolfgangLi, Xin