Die chronologische Liste zeigt aktuelle Veröffentlichungen aus dem Forschungsbetrieb der Hochschule Weihenstephan-Triesdorf. Zuständig ist das Zentrum für Forschung und Wissenstransfer (ZFW).
Shallow geothermal applications have become standard solutions for heating and cooling in many newly built or redeveloped residential neighborhoods, but current urban development practices do not yet consider the new demands that result from the intensive thermal use of the shallow subsurface. A coordinated site characterization is of great importance as a sound basis for an optimized planning of geothermal systems that brings together user requirements (heating, cooling, and/or seasonal energy storage) and (hydro)geological subsurface conditions. The aim of this study is to raise awareness and to demonstrate the relevance of a coordinated site characterization. Therefore, this study quantifies the advantages of a site-specific over a desktop-based site characterization in reducing uncertainty for calculation of borehole heat exchanger length and predicted induced temperature changes in the subsurface for a newly developed residential neighborhood in the city of Taucha, Germany. Results show that savings of over EUR 1850 per house (EUR 98,050 for the entire neighborhood) can be achieved by a coordinated exploration and prediction accuracy of temperature plume development was substantially improved. Although being more cost intensive, exploration costs for this case study are <3% of the assumed individual geothermal system costs of EUR 16,000 if divided equally among geothermal users. Three different options are presented to implement coordinated exploration concepts into site development practice.
Mehr
Prof. Dr. Thomas Vienken,
Emanuel Huber,
Manuel Kreck,
Peter Huggenberger,
Prof. Dr. Peter Dietrich
Tracer testing is a well-established technique in hydrogeological site characterization. However, certain a priori knowledge of the hydraulic regime is required beforehand to avoid test failure, e.g. miss of tracer. In this study, we propose a novel tracer test concept for the hydraulic characterization of shallow unconsolidated sedimentary deposits when only scarce a priori information on the hydraulic regime is available. Therefore, we combine conventional salt tracer testing with direct push vertical high resolution electrical conductivity logging. The proposed tracer test concept was successfully tested on coarse, braided river deposits of the Tagliamento River, Italy. With limited a priori information available two tracer tests were performed in three days to reliably determine ground water flow direction and velocity allowing on-site decision-making to adaptively install observation wells for reliable breakthrough curve measurements. Furthermore, direct push vertical electrical profiling provided essential information about the plume characteristics with outstanding measurement resolution and efficiency.
Mehr
Nils Gueting,
Prof. Dr. Thomas Vienken,
Anja Klotzsche,
Jan van der Kruk,
Jan Vanderborght,
Jef Caers,
Harry Vereecken,
Andreas Englert
Limited knowledge about the spatial distribution of aquifer properties typically constrains our ability to predict subsurface flow and transport. Here we investigate the value of using high resolution full-waveform inversion of cross-borehole ground penetrating radar (GPR) data for aquifer characterization. By stitching together GPR tomograms from multiple adjacent crosshole planes, we are able to image, with a decimeter scale resolution, the dielectric permittivity and electrical conductivity of an alluvial aquifer along cross sections of 50 m length and 10 m depth. A logistic regression model is employed to predict the spatial distribution of lithological facies on the basis of the GPR results. Vertical profiles of porosity and hydraulic conductivity from direct-push, flowmeter and grain size data suggest that the GPR predicted facies classification is meaningful with regard to porosity and hydraulic conductivity, even though the distributions of individual facies show some overlap and the absolute hydraulic conductivities from the different methods (direct-push, flowmeter, grain size) differ up to approximately one order of magnitude. Comparison of the GPR predicted facies architecture with tracer test data suggests that the plume splitting observed in a tracer experiment was caused by a hydraulically low-conductive sand layer with a thickness of only a few decimeters. Because this sand layer is identified by GPR full-waveform inversion but not by conventional GPR ray-based inversion we conclude that the improvement in spatial resolution due to full-waveform inversion is crucial to detect small-scale aquifer structures that are highly relevant for solute transport.
Mehr
Tianyuan Zheng,
Haibing Shao,
Sophie Schelenz,
Philipp Hein,
Prof. Dr. Thomas Vienken,
Zhonghe Pang,
Olaf Kolditz,
Thomas Nagel
Berechtigungen: Peer Reviewed
Efficiency and economic analysis of utilizing latent heat from groundwater freezing in the context of borehole heat exchanger coupled ground source heat pump systems (2016) Applied Thermal Engineering 105 , S. 314-326.
DOI: 10.1016/j.applthermaleng.2016.05.158
Jörg Hausmann,
Prof. Dr. Peter Dietrich,
Prof. Dr. Thomas Vienken,
Ulrike Werban
Berechtigungen: Peer Reviewed
Technique, analysis routines, and application of direct push driven in situ color logging (2016) Environmental Earth Sciences 75 (11), S. 1-21.
DOI: 10.1007/s12665-016-5515-7
Marian Andrei Chirila,
Benjamin Christoph,
Prof. Dr. Thomas Vienken,
Prof. Dr. Peter Dietrich,
Jan Bumberger
Berechtigungen: Peer Reviewed
Development of an in-situ thermal conductivity measurement system for exploration of the shallow subsurface (2016) Measurement Science and Technology 27 (6).
DOI: 10.1088/0957-0233/27/6/065901
Klodwig Suibert Oskar Seibertz,
Marian Andrei Chirila,
Jan Bumberger,
Prof. Dr. Peter Dietrich,
Prof. Dr. Thomas Vienken
Berechtigungen: Peer Reviewed
Development of in-aquifer heat testing for high resolution subsurface thermal-storage capability characterisation (2016) Journal of Hydrology 534 , S. 113-123.
DOI: 10.1016/j.jhydrol.2015.12.013
Prof. Dr. Thomas Vienken,
Falk Händel,
Jannis Epting,
Prof. Dr. Peter Dietrich,
Rudolf Liedl,
Peter Huggenberger
Berechtigungen: Peer Reviewed
Energiewende braucht Wärmewende – Chancen und Limitierungen der intensiven thermischen Nutzung des oberflächennahen Untergrundes in urbanen Gebieten vor dem Hintergrund der aktuellen Energiedebatte in Deutschland (2016) Grundwasser 21 , S. 69-73.
DOI: 10.1007/s00767-015-0303-y
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