Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
Prof. Dr. Thomas Vienken,
Edward C. Reboulet,
Carsten Leven,
Manuel Kreck,
Ludwig Zschornack,
Prof. Dr. Peter Dietrich
Berechtigungen: Peer Reviewed
Field comparison of selected methods for vertical soil water content profiling (2013) Journal of Hydrology 501 , S. 205-212.
DOI: 10.1016/j.jhydrol.2013.08.004
Claudia Schütze,
Prof. Dr. Thomas Vienken,
Ulrike Werban,
Prof. Dr. Peter Dietrich,
Anthony Finizola,
Carsten Leven
Berechtigungen: Peer Reviewed
Joint application of geophysical methods and Direct Push-soil gas surveys for the improved delineation of buried fault zones (2012) Journal of Applied Geophysics 82 , S. 129-136.
DOI: 10.1016/j.jappgeo.2012.03.002
Katrin Matthes,
Hagen Nusche,
Prof. Dr. Peter Dietrich,
Prof. Dr. Thomas Vienken
Berechtigungen: Peer Reviewed
Effects of measuring inaccuracy during grain size analyses on the determination of hydraulic conductivity (2012) Grundwasser 17 (2), S. 105-111.
DOI: 10.1007/s00767-012-0191-3
Prof. Dr. Thomas Vienken,
Carsten Leven,
Prof. Dr. Peter Dietrich
Berechtigungen: Peer Reviewed
Use of CPT and other direct push methods for (hydro-) stratigraphic aquifer characterization — a field study (2012) Canadian Geotechnical Journal 49 (2), S. 197-206.
DOI: 10.1139/t11-094
Carsten Leven,
Hansjörg Weiß,
Prof. Dr. Thomas Vienken,
Prof. Dr. Peter Dietrich
About ten years ago, Direct Push technologies were introduced in Germany as a “new” tool for subsurface characterization. Ever since, they have been frequently used in various fields of site investigations. However, despite over ten years of experience, their application potential is often perceived with scepticism. Closer consideration of the range of applications of this method shows that the technology is indeed being increasingly used, even though it does not seem to be completely accepted in the “consulting world”. This is surprising as Direct Push is already used in Germany in its simplest form—i.e. by percussion coring—on a routine basis. Nonetheless, the full potential of Direct Push has not yet been exploited. This article aims to provide a comprehensive overview on the state of the art of this technology and its various application potentials and limitations.
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Prof. Dr. Thomas Vienken,
Prof. Dr. Peter Dietrich
Determination of hydraulic conductivity (K) and its variation in space is often a major objective of hydrogeological site investigations. However, measurement of K at a high spatial resolution in sedimentary aquifers is a challenge. There are a number of field methods that can be used to determine K, although they differ greatly in terms of their spatial resolution.One commonly used approach is to estimate K from grain size analyses, but the reliability of the resulting K estimates is unclear. The aims of this study are to compare frequently used formulas for the determination of K from grain size data for a broad range of sediment types and to evaluate how well these methods predict K. Sonic sampling was used to obtain minimally disturbed cores in a highly heterogeneous sedimentary aquifer and K values of grain size analyses from 108 core samples were calculated. Despite the high correlation of calculated K derived from different formulas, mean K values differed by several orders of magnitude between the formulas. For the evaluation of the reliability of the K estimates, high resolution direct push slug tests (DPSTs) were also performed in the close vicinity of the cores. A high correlation between ln(KDPST) and ln(Kgrain size) was found for most of the applied formulas. Nevertheless, sample heterogeneity, i.e. the presence of small clay layers in a generally highly permeable sample, led to Kgrain size estimates that were significantly smaller than the KDPST estimates. Based on these results, the applied formulas appear to be suitable for an initial assessment of aquifer K. However, considering the difference in calculated K mean values, results are not sufficiently reliable for the high resolution analyses of K variations needed for flow or transport modeling.
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Steffen Linder,
Hendrik Paasche,
Jens Tronicke,
Ernst Niederleithinger,
Prof. Dr. Thomas Vienken
In this study, we use and extend a recently developed zonal cooperative inversion approach and apply it to the inversion of three independent geophysical field data sets. We invert crosshole P-wave, S-wave, and georadar data sets acquired in sand and gravel dominated unconsolidated sediments to detect and characterize different sedimentary units relevant for an engineering or hydrological site characterization. The zonal cooperative inversion of the three traveltime data sets results in a single subsurface model, which is a geophysical three-parameter model (P-wave, S-wave, and georadar velocity) outlining the major subsurface zonation while explaining all input data sets. Comparing our zonal model to direct push (DP) logging data (tip resistance, sleeve friction, and dielectric permittivity) shows good agreement; i.e., the zones in our geophysical model largely correspond to major DP parameter changes. Furthermore, we demonstrate how the sparse DP data can be inter- and extrapolated to the entire tomographic plane which allows for further geotechnical and hydrological interpretations. This study illustrates that the zonal cooperative inversion approach is highly flexible and an excellent tool to characterize a variety of environments in terms of multiple physical parameters.
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Gerhard Radlmayr
Referent für Wissenstransfer und Forschungskommunikation
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