Doua posturi vacante postdoc Germania
Doua posturi vacante postdoc Germania

 

Vacancies - Geowissenschaftliches Zentrum Göttingen (GZG)

In the Department of Applied Geology (Angewandte Geologie, Prof. Dr. M. Sauter) of the Geoscientific Centre at the Georg-August-Universität Göttingen two positions are available in the context of a large-scale EU-project (MUSTANG) and to be filled as soon as possible:


Postdoctoral Researcher
( Synthesis of organic compounds / thermodynamics and kinetics of multiphase systems)


and

Postdoctoral Researcher
(Modelling of Processes in Georeservoirs)


Candidates shall have a University Degree in the disciplines Chemistry resp.  Physics, Civil Engineering, Mathematics and a PhD in the resp. fields. They shall be employed  at 100% of the regular weekly working time (39,8 hours/week) at first for two years. Specialisation / interest should be in the fields of the synthesis of new organic compounds for the investigation of fluid-fluid / fluid-solid interfacial processes and / or surface interaction processes. A thorough understanding of the thermodynamics of multiphase systems together with kinetically controlled transport processes between phases is required. For the modelling position interest /experience in the simulation of surface processes and / or multiphase flow processes would be advantageous. Salary is according to TV-L, depending on qualifications.

The University of Göttingen plans to increase the numbers of female researchers, especially in those areas where women are underrepresented. Therefore qualified female researchers are highly encouraged to apply. Mobility impaired researchers shall be preferentially employed, providing equal qualifications.

A written application including the standard materials should be sent at the latest 3 weeks after the advertisement to: Prof. Dr. Martin Sauter, Geowissenschaftliches Zentrum der Universität Göttingen, Abteilung Angewandte Geologie, Goldschmidtstrasse 3, 37077 Göttingen.

We request that you send us copies of your application documents. We will destroy the documents after a holding period of five months. Application documents will only be returned to you if you provide a self-addressed adequately stamped envelope.

 

 
 
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SEMINARIO DEL GRUPO DE

HIDROLOGÍA SUBTERRÁNEA

UNIVERSIDAD POLITÉCNICA DE CATALUÑA

"Experimental Upscaling of Flow and Transport in Porous Media"

(autores: A. Englert, N. Güting, T. Vaitl, T. Griese and T. Gökpinar)

a cargo de

Andreas Englert (Ruhr-University Bochum)

 

Día: MIÉRCOLES, 5 de Octubre de 2011

Hora: 12.15 hrs.

Lugar: Aula CIHS (Planta Baja). Departamento Ingeniería del Terreno (módulo D2-UPC).

Andreas Englert (Ruhr-University Bochum)

Día: MIÉRCOLES, 5 de Octubre de 2011

Hora: 12.15 hrs.

Lugar: Aula CIHS (Planta Baja). Departamento Ingeniería del Terreno (módulo D2-UPC).

Abstract:

While the physics of mixing and reaction is well understood at the pore scale, the quantification of these processes at the scales relevant for applications is highly challenging. The inability to sample all the subsurface spatial heterogeneity implies that the processes involved need to be averaged. The loss of information induced by this procedure causes anomalous behaviors of the upscaled dispersion and reaction rates. As mathematical and numerical upscaling of such processes is challenging and such upscaling procedures need to be verified to become useful for proper transport prediction, the project here focuses on experimental laboratory scale upscaling of flow and transport. 
In a first study we examined the potential of laboratory sandbox experiments and studied in detail the impact of the injection near field on the larger scale transport process. Thereto we filled a sandbox with sediments, which were characterized for hydraulic conductivity prior to filling. The latter was then accomplished in such way that different source zone release conditions were arranged by modifying the hydraulic conductivity of injection near-field, while the surrounding hydraulic conductivity field remained unchanged. The experiments in this first sandbox model gave us confidence in laboratory sandbox models and showed that source zone release conditions are of importance for plume development. In detail, we found that source zone release conditions affect the first and second temporal moments, corresponding to the mean arrival time and the spreading of breakthrough curves and the spatial spreading of solute plumes in both the longitudinal and the transverse direction. We further found that in future experiments monitoring of the injection function and subsequent consideration of the measured injection function in the analysis of breakthrough curves might be beneficial for proper parameter estimation. 
In a second study we examined flow and transport in cube shaped sediment samples before and after freezing. Thereto we developed a cube shaped experimental setup, which allows for fill of sediment, performance of flow and transport experiments, freezing of the entire apparatus and withdrawal of a frozen sediment cube from the apparatus. This is an ongoing study. However, first results suggest that the apparatus works and there are only small changes in flow and transport parameters pre- and post- freezing. This is promising for the following experiments. In future studies the frozen sediment cubes will be utilized to arrange heterogeneous sediment formations in sandboxes. Thereto development of an apparatus is ongoing, which will allow to utilize the well explored frozen sediment cubes from experiments in the cube shaped experimental setup. Such experiments will allow experimental upscaling from the dm- to m-scale of the following processes: flow, conservative transport, reactive transport, reactive transport including feedbacks (precipitation and dissolving).

El seminario se podrá ver publicado la próxima semana en la página del grupo: www.h2ogeo.upc.es