Inst. Angewandte Geowissenschaften

131 Items

Recent Submissions
Rock Surface Roughness Determination: Matlab scripts of evaluation algorithms and original scanned surfaces

Marsch, Kristofer (2020-02-01)

There exist many mathematical approaches for the determination of surface roughness in the context of rock engineering. Unfortunately, in most publications on that topic the evaluation algorithms are not fully disclosed. This makes it almost impossible to reproduce and verify prior findings. Even achieving an acceptable accordance is labour-intensive. Therefore, this data submission offers some...

Development of a fully coupled biogeochemical reactive transport model to simulate microbial oxidation of organic carbon and pyrite under nitrate‐reducing conditions

Knabe, Dustin ; Kludt, Christoph ; Jacques, Diederik ; Lichtner, Peter ; Engelhardt, Irina (2018-11-23)

In regions with intensive agriculture nitrate is one of the most relevant contaminants in groundwater. Denitrification reduces elevated nitrate concentrations in many aquifers, yet the denitrification potential is limited by the concentration of available electron donors. The aim of this work was to study the denitrification potential and its limitation in natural sediments. A column experiment...

Reservoir-scale transdimensional fracture network inversion

Somogyvári, Márk ; Kühn, Michael ; Reich, Sebastian (2019-11-08)

The Waiwera aquifer hosts a structurally complex geothermal groundwater system, where a localized thermal anomaly feeds the thermal reservoir. The temperature anomaly is formed by the mixing of waters from three different sources: fresh cold groundwater, cold seawater and warm geothermal water. The stratified reservoir rock has been tilted, folded, faulted, and fractured by tectonic movement, p...

Fault‐controlled lithospheric detachment of the volcanic southern South Atlantic rift

Becker, Katharina ; Tanner, David C. ; Franke, Dieter ; Krawczyk, Charlotte M. (2016-02-17)

We present structural models of two exemplary conjugate seismic lines of the southernmost South Atlantic margins to examine their initial evolution, especially the seaward‐dipping reflectors (SDRs). Modeling illustrates the different structure and inclination angles of the SDRs, which therefore require different subsidence histories. Since typical symmetrical subsidence models are not applicabl...

Products of Hexavalent Chromium Reduction by Green Rust Sodium Sulfate and Associated Reaction Mechanisms

Thomas, Andrew N. ; Eiche, Elisabeth ; Göttlicher, Jörg ; Steininger, Ralph ; Benning, Liane G. ; Freeman, Helen M. ; Dideriksen, Knud ; Neumann, Thomas (2018-10-29)

The efficacy of in vitro Cr(VI) reduction by green rust sulfate suggests that this mineral is potentially useful for remediation of Cr-contaminated groundwater. Previous investigations studied this reaction but did not sufficiently characterize the intermediates and end products at chromate (CrO42−) concentrations typical of contaminant plumes, hindering identification of the dominant reaction ...

Detection of Karst Features in the Black Hills Area in South Dakota/Wyoming, USA, Based on Evaluations of Remote Sensing Data

Theilen-Willige, Barbara (2018-05-28)

Landsat 8, Sentinel 2, Aster, RapidEye and PlanetScope data and Sentinel 1- and Advanced Land Observing Satellite (ALOS)-Phased Array type L-band Synthetic Aperture Radar (PALSAR)-radar images have been evaluated for a karst feature inventory in the Black Hills area in Wyoming/South Dakota, USA. The GeoInformation System (GIS) integrated evaluation of the different satellite data included as we...

Reassessing Hydrological Processes That Control Stable Isotope Tracers in Groundwater of the Atacama Desert (Northern Chile)

Scheihing, Konstantin W. ; Moya, Claudio E. ; Struck, Ulrich ; Lictevout, Elisabeth ; Tröger, Uwe (2017-12-26)

A collection of 514 stable isotope water samples from the Atacama Desert is being reassessed geostatistically. The evaluation reveals that adjacent Andean catchments can exhibit distinct δ18O and δ2H value ranges in meteoric waters, despite similar sample altitudes of up to 4000 m above sea level (a.s.l.). It is proposed that the individual topographic features of each catchment at the western ...

Malongitubus: a possible pterobranch hemichordate from the early Cambrian of South China

Hu, Shixue ; Erdtmann, Bernd-Dietrich ; Steiner, Michael ; Zhang, Yuandong ; Zhao, Fangchen ; Zhang, Zhiliang ; Han, Jian (2017-12-04)

Malongitubus kuangshanensis Hu, 2005 from the early Cambrian Chengjiang Lagerstätte of China is redescribed as a pterobranch and provides the best evidence to demonstrate that hemichordates were present as early as Cambrian Stage 3. Interpretation of this taxon as a hemichordate is based on the morphology of the branched colony and the presence of resistant inner threads consistent with the rem...

Experimental characterization and simulation of lead surface reactions for application at geothermal conditions

Driba, Dejene Legesse (2019)

Scaling (=mineral precipitation) frequently occurs in geothermal power plants representing a problem for plant operation by reducing the flow-through in pipes or in pores of the reservoir rock. The availability of potential scale forming chemical components within the fluid is among other geochemical reactions largely determined by its distribution at the interface between fluid and rock. There...

On factors controlling the mobility of organic compounds in water-rock interactions

Zhu, Yaling (2019)

The chemistry of organic compounds is based on carbon, the fifteenth most abundant element in the crust. Deriving from mainly biological systems, organic compounds can be incorporated into sedimentary rocks, and remain within the lithosphere for extended geological time periods, undergoing lengthy exposure to elevated temperatures and pressures which results in chemical transformations and phys...

Structural analysis of S-wave seismics around an urban sinkhole: evidence of enhanced dissolution in a strike-slip fault zone

Tanner, David C. ; Wadas, Sonja Halina ; Polom, Ulrich ; Krawcyk, Charlotte M. (2017)

Abstract. In November 2010, a large sinkhole opened up in the urban area of Schmalkalden, Germany. To determine the key factors which benefited the development of this collapse structure and therefore the dissolution, we carried out several shear-wave reflection-seismic profiles around the sinkhole. In the seismic sections we see evidence of the Mesozoic tectonic movement in the form of a NW–SE...

High-resolution shear-wave seismic reflection as a tool to image near-surface subrosion structures – a case study in Bad Frankenhausen, Germany

Wadas, Sonja Halina ; Polom, Ulrich ; Krawcyk, Charlotte M. (2016)

Abstract. Subrosion is the subsurface leaching of soluble rocks that results in the formation of depression and collapse structures. This global phenomenon is a geohazard in urban areas. To study near-surface subrosion structures, four shear-wave seismic reflection profiles, with a total length of ca. 332m, were carried out around the famous leaning church tower of Bad Frankenhausen in northern...

The impact of temperature and oxygen on water-rock interactions in siliciclastic rocks and implications for aquifer thermal energy storage systems

Müller, Daniel Richard (2018)

Water-rock interactions are sorption-, dissolution-, precipitation-, and redox reactions at the interface between rock matrix and water. In aquifer thermal energy storage (ATES) systems, certain water-rock interactions can have undesired consequences, such as clogging of aquifer pores or contaminant release, and are therefore geochemical risks. Their prediction and prevention requires site-spec...

The characterization of water-soluble organic compounds released from organic-rich sediments

Calzada Mendoza, Jacqueline Mireya (2018)

The study of deep biosphere, especially the growth under extreme conditions (e.g. high temperatures and limited substrates), has attracted considerable attention in recent decades. Even under such conditions, water and low molecular weight organic acids (LMWOA) are present. LMWOA play an important role in several biotic and abiotic processes, e.g. in the Krebs cycle used by all aerobic organism...

Water and water shortage Iran

Ghader, Fatemeh (2018-10-22)

Tashk-Bakhtegan and Maharlu lakes' basin in Fars province in the south of Iran is facing a harsh water shortage in recent years. In this study for the first time, a complete research was carried out to understand the hydrologic circle of Tashk-Bakhtegan and Maharlu lakes' basin. In this study those basins were evaluated in terms of meteorology, surface water, groundwater, water quality, and wa...

Water and water shortage in Iran

Ghader, Fatemeh (2018)

Tashk-Bakhtegan and Maharlu lakes' basin in Fars province in the south of Iran is facing a harsh water shortage in recent years. Semi-dry and dry conditions are prevailing climate conditions in the basin and the wet condition can only be seen in the small part of the north. Groundwater is the main source to provide water for different purposes such as agriculture, industry and drinking. Over-ex...

Quantification of cooling effects and water demand of urban facade greenings

Hölscher, Marie-Therese (2018)

Higher air temperatures in cities lead to increased heat stress for the urban population, especially during the night in hot summer periods. Facade greening is often discussed as a promising mitigation strategy as it can be applied on building surfaces where the heat stress is mainly caused. It reduces the stored energy in the building mass through shading and transpirative cooling and addition...

P-T-X phase diagrams of carbonates

Müller, Jan (2018)

This thesis has been devoted to the high pressure (HP) and high temperature (HT) effects on the FeCO3-MgCO3 and the CaCO3-MgCO3 solid solution series. In more detail, I have investigated the vibrational behavior of the FeCO3-MgCO3 solid solution series under HP/HT conditions across the electronic high spin (HS) to low spin (LS) transition up to 60 GPa and 700 K and I have furthermore determined...

Compositional alterations of petroleum as a result of expulsion and migration in the North Sea Central Graben petroleum system

Ziegs, Volker (2018)

The Mandal Formation, the principal source rock in the well-explored North Sea Central Graben, has been identified as a locally very inefficient expeller of its generated products, although having charged numerous petroleum accumulations in that basin. This unusual behaviour for marine shales makes the Mandal Formation an interesting natural laboratory to re-assess the factors controlling gener...

High-resolution shear wave reflection seismics and borehole seismics as tools for the imaging and the characterization of near-surface subrosion structures

Wadas, Sonja Halina (2018)

Subrosion and the resulting structures, such as sinkholes and depressions, pose a great hazard risk. They can cause damage to buildings and infrastructure, and lead to life-threatening situations. But compared to other natural hazards, like earthquakes and tsunamis, very little is known about the generation processes or the possibilities of forecasting. Germany suffers from a widespread sinkhol...