Goetz HornbruchChristian-Albrechts-Universität zu Kiel | CAU · Institute of Geosciences
Goetz Hornbruch
Dr.
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34
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Introduction
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April 2003 - present
Publications
Publications (34)
During test operation of a geological latent heat storage system as a potential option in the context of heat supply for heating and cooling demands a part of a shallow quaternary glacial aquifer at the “TestUM” test site is frozen. To evaluate the current thermal state in the subsurface the dimension of the frozen volume has to be known. With the...
Seismic crosshole techniques are powerful tools to characterize the properties of near-surface aquifers. Knowledge of rock-physical relations at the field scale is essential for interpreting geophysical measurements. However, it remains difficult to extend the results of existing laboratory studies to the field scale due to the usage of different f...
The envisaged future dihydrogen (H2) economy requires a H2 gas grid as well as large deep underground stores. However, the consequences of an unintended spread of H2 through leaky pipes, wells, or subterranean gas migrations on groundwater resources and their ecosystems are poorly understood. Therefore, we emulated a short-term leakage incident by...
Despite their potential in heating supply systems, thus far high-temperature aquifer thermal energy storages (HT-ATES) currently lack widespread application. Reducing the potential risks by improving the predictability of hydrogeochemical processes accelerated or initiated at elevated temperatures might promote the development of this technology. T...
This document compiles the data related to a high temperature heat injection test, which was carried out at an injection temperature of 74°C in a shallow aquifer and is presented by Heldt et al. ([1]). The data set contains transient measurements of temperatures at 18 wells in 10 depths and measurements of the experimental boundary conditions (inje...
High Temperature-Aquifer Thermal Energy Storage (HT-ATES) is a promising option to compensate for the seasonal mismatch between heating supply and demand in the heating sector based on renewable energies. To test and verify numerical and experimental methods for predicting HT-ATES thermo-hydraulic impacts, a small-scale heat injection test with inj...
Aquifer thermal energy storage (ATES) is a key concept for the use of renewable energy resources. Interest in ATES performed at high temperature (HT-ATES; > 60 °C) is increasing due to higher energetic efficiencies. HT-ATES induces temperature fluctuations that exceed the natural variability in shallow aquifers, which could lead to adverse effects...
The petrophysical observation of hydrological processes in the field is often limited to parameter estimations and determinations. Dependencies between different petrophyiscal parameters remain sparsely studied. This work aims for the development of a monitoring concept and observation strategies in the scale of measurement to understand the impact...
Nanoscale zero-valent iron (NZVI) particles can be used for in situ groundwater remediation. The spatial particle distribution plays a very important role in successful and efficient remediation, especially in heterogeneous systems. Initial sand permeability (k
0) influences on spatial particle distributions were investigated and quantified in homo...
Successful groundwater remediation by injecting nanoscale zero-valent iron (NZVI) particles requires efficient particle transportation and distribution in the subsurface. This study focused on the influence of injection velocity and particle concentration on the spatial NZVI particle distribution, the deposition processes and on quantifying the ind...
Even today the remediation of organic contaminant source zones poses significant technical and economic challenges. Nanoscale zero-valent iron (NZVI) injections have proved to be a promising approach especially for source zone treatment. We present the development and the characterization of a new kind of NZVI with several advantages on the basis o...
The ambition to apply carbon capture and storage (CCS) requires the provision of effective monitoring approaches that can be applied to detect and to characterize a potential migration or leakage of CO2 and saline formation water into geological compartments between the storage formation and the protected groundwater resource. The sensitivity of mo...
A small scale and temporally limited CO2 injection test was performed in a shallow aquifer to investigate the geochemical impact of CO2 upon such aquifers and to apply and verify different monitoring methods. Detailed site investigation coupled with multiphase simulations were necessary to design the injection experiment and to set up the monitorin...
Potential pathways in the subsurface may allow upwardly migrating gaseous CO 2 from deep geological storage formations to be released into near surface aquifers. Consequently, the availability of adequate methods for monitoring potential CO 2 releases in both deep geological formations and the shallow subsurface is a prerequisite for the deployment...
A small scale and temporally limited CO2 injection test was performed in a shallow aquifer to investigate the geochemical impact of CO2 upon such aquifers and to apply and verify different monitoring methods. Detailed site investigation coupled with multiphase simulations were necessary to design the injection experiment and to set up the monitorin...
CO2 leakage from subsurface storage sites is one of the main concerns connected with the CCS technology. As CO2 leakages into near surface formations appear to be very unlikely within pilot CCS projects, the aim of this work is to emulate a leakage by injecting CO2 into a near surface aquifer. The two main questions pursued by the injection test ar...
Predicting geochemical alterations in shallow aquifers driven by
CO2 intrusion is important with regard to groundwater quality
aspects, risk assessment, and monitoring concepts. CO2
concentrations could be increased in response to leakage from deep
geological storage formations due to upward CO2 migration.
The associated mechanisms and processes in...
Leakage from subsurface storage sites is one of the main concerns
connected with CCS technology. One potential risk associated with CO2
leaking from storage sites is the geochemical alteration of shallow
groundwater systems causing pH decrease, mineral dissolution and
potential mobilization of heavy metals. As on the one hand leakages into
drinking...
Für die Akzeptanz neuer Technologien, wie z.B. der Speicherung von CO2 in tiefen geologischen Formationen (CCS), ist eine fundierte Gefährdungsabschätzung für potenzielle Leckagefälle unerlässlich. Die Untersuchung der Auswirkungen von CO2-Einträgen in oberflächennahen Grundwasserleitern unter kontrollierten Bedingungen ist daher ein wichtiger Beit...
CO2 leakage from subsurface storage sites is one of the main concerns connected with the CCS technology. As CO2 leakages into near surface formations appear to be very unlikely within pilot CCS projects, the aim of this work is to emulate a leakage by injecting CO2 into a near surface aquifer. The two main questions pursued by the injection test ar...
The number of observation points required to accurately map a field-scale contaminant plume is rarely known. The aim of this study was to identify the quality of a field site investigation as a function of aquifer heterogeneity and the number of monitoring wells by using virtual contamination scenarios. About 50 observation wells are shown to be ne...
Most established methods to characterize aquifer structure and hydraulic conductivities of hydrostratigraphical units are not capable of delivering sufficient information in the spatial resolution that is desired for sophisticated numerical contaminant transport modeling and adapted remediation design. With hydraulic investigation methods based on...
Changes in the electron acceptor supply must be considered in order to simulate reliable future plume spreading in groundwater. For example, decreasing amounts of electron acceptor mass fluxes from the unsaturated zone caused by less groundwater recharge due to surface sealing could lead to further plume spreading during the forecast horizon. Howev...
The supply of electron acceptors from leachate through the unsaturated zone could represent a special boundary condition with regard to contaminant plume spreading in groundwater. This is an important issue for the acceptance of monitored natural attenuation (MNA) strategies and the prediction of NA processes, but which to date has received little...
For calculation of microbial degradation processes in aquifers, which have to be evaluated for assessment of natural attenuation, many different approaches are assumed. However, in natural aquifers, the kinetics controlling microbial degradation is difficult to determine. Hence, a simple artificial „virtual aquifer“ is generated on a computer to de...