Geologie: Recent submissions
Anzeige der Dokumente 201-225 von 933
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Thickness of Fluvial Deposits Records Climate Oscillations
; ; ; ; (Journal of Geophysical Research: Solid Earth, 2022-04-08)
Fluvial deposits offer Earth’s best‐preserved geomorphic record of past climate change over geological timescales. However, quantitatively extracting this information remains challenging in part due to the complexity of ... -
An Adaptive Hybrid Vertical Equilibrium/Full‐Dimensional Model for Compositional Multiphase Flow
; ; ; ; (Water Resources Research, 2022-01-21)
Efficient compositional models are required to simulate underground gas storage in porous formations where, for example, gas quality (such as purity) and loss of gas due to dissolution are of interest. We first extend the ... -
A Combined Cosmogenic Nuclides Approach for Determining the Temperature‐Dependence of Erosion
; (Journal of Geophysical Research: Earth Surface, 2022-04-07)
Physical weathering in cold, steep bedrock hillslopes occurs at rates that are thought to depend on temperature, but our ability to quantify the temperature‐dependence of erosion remains limited when integrating over ... -
Controls of the Foreland Deformation Pattern in the Orogen‐Foreland Shortening System: Constraints From High‐Resolution Geodynamic Models
; ; ; (Tectonics, 2022-02-17)
Controls on the deformation pattern (shortening mode and tectonic style) of orogenic forelands during lithospheric shortening remain poorly understood. Here, we use high‐resolution 2D thermomechanical models to demonstrate ... -
Impact of Spreading Rate and Age‐Offset on Oceanic Transform Fault Morphology
; ; (Geophysical Research Letters, 2022-01-24)
Oceanic transform faults (OTFs) are an inherent part of seafloor spreading and plate tectonics, whereas the process controlling their morphology remains enigmatic. Here, we systematically quantify variations in transform ... -
The effect of formation processes on the frequency of palaeolithic cave sites in semiarid zones: Insights from Kazakhstan
; ; ; ; ; (Geoarchaeology, 2022-04-05)
Central Asian caves with Palaeolithic deposits are few, but they provide a rich record of human fossils and cultural assemblages that has been used to model Late Pleistocene hominin dispersals. However, previous research ... -
The fluvial architecture of buried floodplain sediments of the Weiße Elster River (Germany) revealed by a novel method combination of drill cores with two‐dimensional and spatially resolved geophysical measurements
; ; ; ; ; ; ; ; ; ; ; ; (Earth Surface Processes and Landforms, 2022-01-05)
The complex and non‐linear fluvial river dynamics are characterized by repeated periods of fluvial erosion and re‐deposition in different parts of the floodplain. Understanding the fluvial architecture (i.e. the three‐dimensional ... -
Tracing southern Gondwanan sedimentary paths: A case study of northern Namibian late Palaeozoic sedimentary rocks
; ; ; ; ; (Sedimentology, 2022-02-15)
The northern Namibian Karoo‐aged successions are part of a Gondwana‐wide sedimentary system emerging at the Carboniferous–Permian boundary and existing for more than 50 Ma. The Karoo Supergroup sedimentary successions are ... -
Impacts of Peak‐Flow Events on Hyporheic Denitrification Potential
; ; ; ; (Water Resources Research, 2022-03-24)
Subsurface flows, particularly hyporheic exchange fluxes, driven by streambed topography, permeability, channel gradient and dynamic flow conditions provide prominent ecological services such as nitrate removal from streams ... -
Zur nachhaltigen Nutzung von Hochmooren als Tiefumbruchkultur
(2022)
Die Nutzung landwirtschaftliche Nutzung der Hochmoore führt zu hohen Freisetzungsraten an Treibhausgasen. Gegenüber der Deutschen Hochmoorkultur (Grünland auf Hochmoor) lassen sich die Freisetzungsraten durch Tiefumbruch ... -
How to Find Aquifer Statistics Utilizing Pumping Tests? Two Field Studies Using welltestpy
;; ; ; (Groundwater, 2021-07-14)
We present a workflow to estimate geostatistical aquifer parameters from pumping test data using the Python package welltestpy. The procedure of pumping test analysis is exemplified for two data sets from the Horkheimer ... -
The terrestrial impact crater record: A statistical analysis of morphologies, structures, ages, lithologies, and more
(Meteoritics & Planetary Science, 2021-06-30)
Abstract The number of newly discovered and confirmed impact structures on earth is growing continuously. In this review paper, the main attributes of 198 confirmed impact structures and 10 further structures, for which ... -
Spatial variability in river bed porosity determined by nuclear density gauging: A case study from a French gravel‐bed river
; ; ; (Sedimentology, 2021-09-16)
Porosity is one of the key properties of fluvial sediments. It is defined as the ratio of pore volume to total volume. In river science, porosity is often assumed to be spatially constant, which might be a gross simplification ... -
The Role of Fluid Seepage in the Erosion of Mesozoic Carbonate Escarpments
; ; ; (Journal of Geophysical Research: Earth Surface, 2021-11-12)
Mesozoic submarine carbonate escarpments are erosional features that host box canyons, the formation of which had been attributed to seepage erosion in view of their similarity to subaerial box canyons. The latter had been ... -
Size–frequency distribution of shallow landslides in the Black Forest, Germany
;; ; (Earth Surface Processes and Landforms, 2021-10-09)
Landslides are a major hazard in mountainous regions, represent a threat to human life, and cause substantial economic costs. While some landslide hazard assessments, including hazards maps, are available for Germany, their ... -
The effect of asymmetric dune roughness on tidal asymmetry in the Weser estuary
; ; ; ; ; (Earth Surface Processes and Landforms, 2021-06-10)
The bed of estuaries is often characterized by ripples and dunes of varying size. Whereas smaller bedforms adapt their morphological shape to the oscillating tidal currents, large compound dunes (here: asymmetric tidal ... -
Eemian landscape response to climatic shifts and evidence for northerly Neanderthal occupation at a palaeolake margin in northern Germany
; ; ; ; ; ; ; ; ; ; ; ; ; (Earth Surface Processes and Landforms, 2021-09-14)
The prevailing view suggests that the Eemian interglacial on the European Plain was characterized by largely negligible geomorphic activity beyond the coastal areas. However, systematic geomorphological studies are sparse. ... -
Insights into Holocene relative sea‐level changes in the southern North Sea using an improved microfauna‐based transfer function
; ; ; ; ; ; ; ; (Journal of Quaternary Science, 2021-10-11)
In light of global warming and rising relative sea level (RSL), detailed reconstructions of RSL histories and their controlling processes are essential in order to manage coastal‐protection challenges. This study contributes ... -
Denudation Rate Changes Along a Fast‐Eroding Mountainous River With Slate Headwaters in Taiwan From 10Be (Meteoric)/9Be Ratios
; ; ; (Journal of Geophysical Research: Earth Surface, 2020-02-18)
The novel 10Be (meteoric)/9Be system, where 10Be is delivered by precipitation and stable 9Be is released by weathering, provides denudation rates over weathering‐erosion timescales. The new tool is applicable to quartz‐poor ... -
Effects of CO2 and Ocean Mixing on Miocene and Pliocene Temperature Gradients
; ; ; (Paleoceanography and Paleoclimatology, 2022-02-11)
Cenozoic climate changes have been linked to tectonic activity and variations in atmospheric CO2 concentrations. Here, we present Miocene and Pliocene sensitivity experiments performed with the climate model COSMOS. The ... -
Tracking Downstream Variability in Large Grain‐Size Distributions in the South‐Central Andes
; (Journal of Geophysical Research: Earth Surface, 2021-08-26)
Mixed sand‐ and gravel‐bed rivers record erosion, transport, and fining signals in their bedload size distributions. Thus, grain‐size data are imperative for studying these processes. However, collecting hundreds to thousands ... -
New insights into particle transport in karst conduits using comparative tracer tests with natural sediments and solutes during low‐flow and high‐flow conditions
; ; (Hydrological Processes, 2022-01-23)
Colloidal particles are an important vector for the transport of contaminants in karst aquifers, characterized by a high degree of hydrologic variability. Understanding this heterogeneity and hydrogeological functioning ... -
Carbon Dioxide and Methane Release Following Abrupt Thaw of Pleistocene Permafrost Deposits in Arctic Siberia
; ; ; ; ; ; ; ; ; (Journal of Geophysical Research: Biogeosciences, 2021-11-01)
The decomposition of thawing permafrost organic matter (OM) to the greenhouse gases (GHG) carbon dioxide (CO2) and methane forms a positive feedback to global climate change. Data on in situ GHG fluxes from thawing permafrost ... -
Focused methane migration formed pipe structures in permeable sandstones: Insights from uncrewed aerial vehicle‐based digital outcrop analysis in Varna, Bulgaria
; ; ; ; ; ; ; ; (Sedimentology, 2021-05-24)
Focused fluid flow shapes the evolution of marine sedimentary basins by transferring fluids and pressure across geological formations. Vertical fluid conduits may form where localized overpressure breaches a cap rock ... -
The Influence of Sediment Transport on Stationary and Mobile Knickpoints in River Profiles
(Journal of Geophysical Research: Earth Surface, 2021-11-26)
The analysis of stationary and mobile knickpoints has been one of the most powerful concepts in tectonic geomorphology for decades. While several models combining bedrock incision and sediment transport are available, the ...
