Filtering by Subject: Sedimentology

Complementary classifications of aeolian dunes based on morphology, dynamics, and fluid mechanics

Sylvain Courrech du Pont, David Michael Rubin, Clément Narteau, et al.

Published: 2023-10-03
Subjects: Earth Sciences, Fluid Dynamics, Geomorphology, Other Earth Sciences, Physical Sciences and Mathematics, Physics, Planetary Geomorphology, Planetary Sciences, Sedimentology

Dunes form where winds blow over a bed of mobile sediment grains – conditions that are common in our solar system. On Earth, dunes abound in arid continental interiors and along sandy coastlines. Dune fields have also been recognized on other planetary bodies, including Venus, Mars, Saturn’s moon Titan, and Pluto. Despite the relatively basic conditions required for their formation, dunes adopt a [...]

Spontaneous Unsteadiness and Sorting in Pyroclastic Density Currents and their Deposits

Pete Rowley, Rebecca Williams, Matthew Johnson, et al.

Published: 2023-08-22
Subjects: Geology, Sedimentology, Stratigraphy, Volcanology

Pyroclastic density currents (PDCs) pose substantial risk to populations living on and around active volcanoes, but their structure and internal dynamics are poorly understood. Much of this understanding is derived from interpretation of their widespread deposits. Scaled experiments are able to probe different conditions, to explore how changing flow dynamics relate to the wide variety of [...]

Application of the authigenic 10Be/9Be dating to constrain the age of a long-lived lake and its regression in an isolated intermontane basin: The case of Late Miocene Lake Turiec, Western Carpathians

Michal Šujan, Kishan Aherwar, Rastislav Vojtko, et al.

Published: 2023-07-31
Subjects: Earth Sciences, Geochemistry, Physical Sciences and Mathematics, Sedimentology, Stratigraphy

The depositional record of intermontane basins provides a valuable archive of the temporal evolution of orogenic belts; their common isolated nature may, however, hinder the efficient usage of standard approaches to constrain the age of a basin fill. In this paper the authigenic 10Be/9Be dating method is employed and tested to construct an age model of the existence and regression of Lake Turiec, [...]

Sedimentology and sequence stratigraphy of shallow-marine, coarse-grained siliciclastic deposits in the southern Utsira High: the Late Jurassic intra-Draupne Formation sandstones in the Johan Sverdrup Field (Norwegian North Sea).

Josep Maria Puig Lopez, Miquel Poyatos-Moré, John Howell

Published: 2023-06-30
Subjects: Earth Sciences, Geology, Sedimentology, Stratigraphy, Tectonics and Structure

Thin, condensed coarse-grained shallow-marine successions can be difficult to describe and interpret, especially in the subsurface because they commonly lack finer grained intervals which are typically associated with sequence stratigraphic surfaces. This lack of mudstones and siltstones means that they also typically make excellent reservoir intervals. The Oxfordian to Volgian intra-Draupne [...]

Seismic Stratigraphy of Contourite Drift Deposits Associated with the Loop Current on the Eastern Campeche Bank, Gulf of Mexico

Christopher Michael Lowery, Ligia Perez Cruz, Jaime Urrutia Fucugauchi, et al.

Published: 2023-06-08
Subjects: Geophysics and Seismology, Oceanography, Sedimentology, Stratigraphy

The Loop Current is a key component of the northward transport of warm, salty water and an important influence on Gulf of Mexico hydrography. Understanding how the Loop Current will respond to ongoing anthropogenic warming is critically important, but the history of the Loop Current is poorly known. Here, we present the results of a high resolution multichannel seismic survey of sediment drifts [...]

Macroplastic fragmentation in rivers

Maciej Liro, Anna Zielonka, Tim van Emmerik

Published: 2023-05-25
Subjects: Earth Sciences, Environmental Indicators and Impact Assessment, Geomorphology, Hydrology, Other Earth Sciences, Other Environmental Sciences, Sedimentology

The process of macroplastic (>0.5 cm) fragmentation results in the production of smaller plastic particles (micro- and nanoplastics), which threaten biota and human health and are difficult to remove from the environment. The global coverage and long retention times of macroplastic waste in fluvial systems (ranging from years to centuries) create long-lasting and widespread potential for its [...]

Mesozoic paleogeography, structural configuration and evolution of the central Northern Calcareous Alps (Eastern Alps, Austria): Alternative scenarios and discussion

Oscar Fernandez, Hugo Ortner, Diethard Sanders, et al.

Published: 2023-05-25
Subjects: Other Earth Sciences, Sedimentology, Tectonics and Structure

One of the most remarkable features of the central Northern Calcareous Alps (Eastern Alps, Austria) is the widespread presence of Upper Triassic deep-water carbonates and Permo-Triassic evaporites resting on deep-water Middle Jurassic sediments and their underlying Upper Triassic shallow-water carbonate platform successions. The Triassic deep-water carbonates and accompanying evaporites have been [...]

In-situ frictional behavior of subducting sediment in the shallow Nankai Trough

Hanaya Okuda, Manami Kitamura, Miki Takahashi, et al.

Published: 2023-04-22
Subjects: Geology, Geophysics and Seismology, Sedimentology, Tectonics and Structure

The transition from smectite to illite at around the depth with temperature of ~150 °C has long been hypothesized as one of controlling factors of the updip limit depth of the seismogenic zone of subduction zones. Although illite has a higher friction coefficient than smectite, previous friction experiments have little reported that the smectite-illite transition accompanies the transition from [...]

Complex seabed geomorphology shaped by various oceanographic processes: a case study from the Gippsland Basin, offshore south-eastern Australia

Nan Wu, Yakup Niyazi, Michael Steventon, et al.

Published: 2023-04-04
Subjects: Earth Sciences, Geology, Geomorphology, Sedimentology

The Gippsland Basin is located in the southeastern continental margin of Australia and hosts a variety of important marine resources. Recent high-resolution seabed mapping reveals that seabed morphology is extremely complex in different regions of the Gippsland Basin (i.e. northern, central and southern regions), ranging from scarps, cyclic step trains, channels, canyons, gullies, and giant [...]

Features of crevasse splay deposits and sedimentary processes associated with levee breaching by the October 2019 flood of the Chikuma River, Central Japan

Masaki Yamada, Hajime Naruse, Yugo Kuroda, et al.

Published: 2023-03-31
Subjects: Earth Sciences, Sedimentology

Field investigations and analyses of modern crevasse splay deposits can both elucidate the processes of levee breaching and help to identify past crevasse splay deposits from geologic strata, thereby estimating the magnitudes of ancient river floods. In this study, we studied levee breach processes and crevasse splay deposits in order to determine the distribution characteristics of the [...]

Stationary surface waves and antidunes in dense pyroclastic density currents

Pete Rowley, Guido Giordano, Aurora Silleni, et al.

Published: 2023-03-28
Subjects: Earth Sciences, Sedimentology, Volcanology

Stationary antidunes are a product of critical flow in open channel systems, but with poor preservation potential. They are related to the existence of stationary surface waves in the overriding current, but their existence in the dense pyroclastic density current regime has been unrecognized to date. Experiments presented here demonstrate that surface waves in simulated dense pyroclastic density [...]

Structure and Morphology of an Active Conjugate Relay Zone, Messina Strait, Southern Italy

Rebecca Dorsey, Sergio Longhitano, Domenico Chiarella

Published: 2023-03-10
Subjects: Earth Sciences, Geology, Geomorphology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy, Tectonics and Structure

Messina Strait is a narrow fault-bounded marine basin that separates the Calabrian peninsula from Sicily in southern Italy. It sits in a seismically active region where normal fault scarps and raised Quaternary marine terraces record ongoing extension driven by southeastward rollback of the Calabrian subduction zone. A review of published studies and new data shows that normal faults in the [...]

Transformation of dense shelf water cascade into turbidity currents: insights from high-resolution geophysical datasets

Nan Wu, Fa Guang Zhong, Yakup Niyazi, et al.

Published: 2023-02-17
Subjects: Earth Sciences, Geomorphology, Sedimentology

Dense shelf water cascade (DSWC) is a common oceanographic phenomenon on many continental shelves. Previous studies indicate that the DSWC could shape seabed physiography and carry seawater, sediment, and organic carbon a long distance from the continental shelf to the basin floor. However, it remains enigmatic how these DSWC’s interact with seabed geomorphology and travel long distances from the [...]

Internal waves and bottom currents interactions around mesophotic reefs, southeastern Mediterranean

Or M. Bialik, Omri Gadol, Aaron Micallef, et al.

Published: 2023-01-24
Subjects: Environmental Monitoring, Geology, Marine Biology, Other Environmental Sciences, Sedimentology

Mesophotic reefs are found in water depths greater than 30m and as such are, for the most part, removed from most direct wave activity, notably in the Mediterranean Sea. There, they are protected from anthropogenic impact and serve as a possible refuge for marine biodiversity in a warming ocean. Yet, like any reef, their growth is modulated by the distribution of the sediment they produce and [...]

Improving Shoreline Forecasting Models with Multi-Objective Genetic Programming

Mahmoud Al Najar, Rafael Almar, Erwin W. J. Bergsma, et al.

Published: 2023-01-10
Subjects: Artificial Intelligence and Robotics, Climate, Environmental Engineering, Environmental Monitoring, Geomorphology, Hydrology, Numerical Analysis and Scientific Computing, Oceanography, Sedimentology, Statistical Models

Given the current context of climate change and increasing population densities at coastal zones, there is an increasing need to be able to predict the development of our coasts. Recent advances in artificial intelligence allow for automatic analysis of observational data. This work makes use of Symbolic Regression, a type of Machine Learning algorithm, to evolve interpretable shoreline [...]


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