Geologie: Recent submissions
Anzeige der Dokumente 51-75 von 931
-
Authors’ Reply to the Discussion by Crisci et al. (2021) on “Experimental Deformation of Opalinus Clay at Elevated Temperature and Pressure Conditions Mechanical Properties and the Influence of Rock Fabric”
; ; ; (Rock Mechanics and Rock Engineering, 2021-11-02)
This is a repond to the comments raised in Crisci´s et al. paper “Discussion on “Experimental Deformation of Opalinus Clay at Elevated Temperature and Pressure Conditions ¬ Mechanical Properties and the Influence of Rock ... -
Verification of Coupled Hydraulic Fracturing Simulators Using Laboratory-Scale Experiments
; ; ; ; ; (Rock Mechanics and Rock Engineering, 2021-03-25)
In this work, we aim to verify the predictions of the numerical simulators, which are used for designing field-scale hydraulic stimulation experiments. Although a strong theoretical understanding of this process has been ... -
Hydromechanical Investigations on the Self-propping Potential of Fractures in Tight Sandstones
; (Rock Mechanics and Rock Engineering, 2021-05-21)
The hydromechanical properties of single self-propping fractures under stress are of fundamental interest for fractured-rock hydrology and a large number of geotechnical applications. This experimental study investigates ... -
Permeability Evolution During Shear Zone Initiation in Low-Porosity Rocks
; ; ; ; (Rock Mechanics and Rock Engineering, 2021-02-09)
Using an innovative experimental set-up (Punch-Through Shear test), we initiated a shear zone (microfault) in Flechtingen sandstone and Odenwald granite under in situ reservoir conditions while monitoring permeability and ... -
Experimental Deformation of Opalinus Clay at Elevated Temperature and Pressure Conditions: Mechanical Properties and the Influence of Rock Fabric
; ; ; ; ; (Rock Mechanics and Rock Engineering, 2021-05-11)
The mechanical behavior of the sandy facies of Opalinus Clay (OPA) was investigated in 42 triaxial tests performed on dry samples at unconsolidated, undrained conditions at confining pressures (pc) of 50–100 MPa, temperatures ... -
Characterization of a landslide-triggered debris flow at a rainforest-covered mountain region in Brazil
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; (Natural Hazards, 2021-05-30)
Debris flows represent great hazard to humans due to their high destructive power. Understanding their hydrogeomorphic dynamics is fundamental in hazard assessment studies, especially in subtropical and tropical regions ... -
The Ries impact and its distal effects in sediments of Central Europe—A review
; (Meteoritics & Planetary Science, 2023-03-23)
The Ries impact is the most important cosmic event in the younger geological history of Europe. Its effects reach far beyond the area considered so far and are documented in manifold evidence. In this paper, the widely ... -
Mechanical Modeling of Pre‐Eruptive Magma Propagation Scenarios at Calderas
; ; (Journal of Geophysical Research: Solid Earth, 2023-02-24)
Simulating magma propagation pathways requires both a well‐calibrated model for the stress state of the volcano and models for dike advance within such a stress field. Here, we establish a framework for calculating ... -
Analog Models of Lithospheric‐Scale Rifting Monitored in an X‐Ray CT Scanner
; (Tectonics, 2023-03-01)
Rifting and continental break‐up are fundamental tectonic processes, the understanding of which is of prime importance. However, the vast temporal and spatial scales involved pose major limitations to researchers. Analog ... -
Simulation of direct shear tests using a forces on fracture surfaces (FFS) approach
; ; (Environmental Earth Sciences, 2021-04-07)
The aim of this work is to provide a complete data set of direct shear tests and to propose a corresponding simulation approach. Tests have been conducted on crystalline rock samples applying constant normal load (CNL) and ... -
Elastic deformation plays a non-negligible role in Greenland’s outlet glacier flow
; ; ; ; ; ; ; ; ; ; (Communications Earth & Environment, 2021-11-09)
Future projections of global mean sea level change are uncertain, partly because of our limited understanding of the dynamics of Greenland’s outlet glaciers. Here we study Nioghalvfjerdsbræ, an outlet glacier of the Northeast ... -
Rare Holocene sediment deposits from Sodmein Playa (Eastern Desert, Egypt)—Stratigraphic assessment and environmental setting
; ; ; ; ; ; ; (Geoarchaeology, 2022-11-12)
Sodmein Playa is one of the rare Pleistocene open‐air sites in the Eastern Desert of Egypt. Based on the associated stone artefact material, it could be assigned to the Middle Stone Age/Last Interglacial. However, it has ... -
Fine‐Sediment Erosion and Sediment‐Ribbon Morphodynamics in Coarse‐Grained Immobile Beds
; (Water Resources Research, 2022-11-14)
In rivers, fine sediments are often transported over immobile coarse grains. With low sediment supply, they tend to aggregate in longitudinal ribbons. Yet, the long‐term evolution of such ribbons and the influence of ... -
An exceptional sedimentary record of initial rifting on the East African Plateau in the Miocene: Lessons from depositional cyclicity and palaeoenvironmental proxies
; ; ; (The Depositional Record, 2022-11-20)
Knowledge about the initial tectonic and depositional dynamics, as well as the influence of early rifting on climate and environmental evolution remains speculative to a large extent, because sediments are usually deeply ... -
Anmerkungen zur Auswertung von Pumpversuchen mit artesischen Brunnen
(2010)Die Auswertung von Pumpversuchen mit konstantem Wasserspiegel, insbesondere Auslaufversuche an artesischen Brunnen, ist kein Standardverfahren in der Hydrogeologie. Da in Europa in Folge zurück gehender Grundwassernutzung ... -
Ein neues Verfahren zur tiefenorientierten Probenahme aus Grundwassermessstellen mit langen Filterstrecken
(2004)In vielen Messnetzen zur Grundwasserbeobachtung finden sich Messstellen mit langen Filterstrecken, bei denen die Entnahme repräsentativer tiefenorientierter Grundwasserproben problematisch ist. Hiermit wird eine neue ... -
Anmerkungen zum Einfluss von dichtebeeinflussten Grundwasserströmungen im Bereich von Altlasten
(2008)Seit Beginn der systematischen Untersuchung von Altlasten ist an vielen Standorten, insbesondere Altablagerungen, der Einfluss von dichtebeeinflussten Grundwasserströmungen für die Ausbreitung von Schadstoffen festgestellt ... -
Mythos Dispersion – wieso Modelle die Wirklichkeit nicht abbilden
(altlasten spektrum, 2017)Über das Dispersionsphänomen liegen in der Praxis vielfach falsche oder ungenaue Vorstellungen vor. Diese gehen in die Modellierung und die Interpretation von Modellergebnissen ein. Der vorliegende Beitrag soll einer Klärung ... -
Anmerkungen zur Berücksichtigung von Belastungen der Bodenluft im Baurechtsverfahren
(altlasten spektrum, 2019)Die zunehmende Bebauung mit Wohnhäusern auf ehemalig gewerblich genutzten Grundstücken sowie auf Grundstücken im Einflussbereich von Grundwasserkontaminationen macht es erforderlich, im Rahmen der behördlichen Bearbeitung ... -
Möglichkeiten und Grenzen der Vor-Ort-Analytik - Eine kritische Betrachtung an Hand von Beispielen
(altlasten spektrum, 2020)Seit Beginn der Altlastenbearbeitung sind Verfahren der Vor-Ort-Analytik für die Erkundung und Sanierungsbegleitung entwickelt und angewendet worden. Insgesamt ist diese Anwendung aber gering geblieben, insbesondere im ... -
Anmerkungen zur Schätzung von Schadstofffrachten im Grundwasser - Beobachtungen am Gartenzaun
(Altlasten Spektrum, 2020)Die Bundes-Bodenschutz- und Altlastenverordnung (BBodSchV) sieht in der Prüfung der Verhältnismäßigkeit von Maßnahmen neben Konzentrationen auch Frachten als Entscheidungskriterium vor. Die Schätzung von Frachten im ... -
Black Sea hydroclimate and coupled hydrology was strongly controlled by high-latitude glacial climate dynamics
; ; ; (Communications Earth & Environment, 2021-03-19)
Abstract The Black Sea experienced pronounced millennial-scale changes in temperature and rainfall during the last glacial coinciding with Dansgaard-Oeschger cycles. However, little is known regarding the amount ... -
Central Asian modulation of Northern Hemisphere moisture transfer over the Late Cenozoic
; ; ; ; ; ; ; ; (Communications Earth & Environment, 2021-06-03)
Earth’s climatic evolution over the last 5 million years is primarily understood from the perspective of marine mechanisms, however, the role of terrestrial feedbacks remains largely unexplored. Here we reconstruct the ... -
Crustal architecture of a metallogenic belt and ophiolite belt: implications for mineral genesis and emplacement from 3-D electrical resistivity models (Bayankhongor area, Mongolia)
; ; ; (Earth, Planets and Space, 2021-04-01)
Crustal architecture strongly influences the development and emplacement of mineral zones. In this study, we image the crustal structure beneath a metallogenic belt and its surroundings in the Bayankhongor area of central ...
