Preprints
There are 5493 Preprints listed.
Structural and Stratigraphic Modeling Techniques in Shale and Tight Oil Basin Reservoir Studies
Published: 2022-01-28
Subjects: Physical Sciences and Mathematics
The validity of regional and basin-wide geomodels of unconventional and tight-oil plays depends on the accuracy and precision of the available structural and stratigraphic frameworks. Integrated reservoir models, combining seismic, log, core, and production data, are critical tools necessary for capturing the basin fill history and for predicting the 3D facies architecture. For researchers, the [...]
Seismic Geomorphology of a Late Cretaceous Turbidite Channel system in Deepwater Kribi/Campo sub-basin, offshore Cameroon
Published: 2022-01-28
Subjects: Earth Sciences, Geology, Geomorphology, Geophysics and Seismology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy
In this study, a seismic reflection dataset and well-log data were integrated to investigate the geometry and internal configuration of a turbidite channel system within the Late Cretaceous interval of the deep-water Kribi-Campo sub-basin, offshore Cameroon. This interval is characterized by a well-developed submarine channel system consisting of an early and a late-stage channel. [...]
Proposal for an index of roads and structures for the mapping of non-vegetated urban surfaces using OSM and Sentinel data
Published: 2022-01-28
Subjects: Remote Sensing
The use of volunteered geographic information (VGI), such as OpenStreetMap (OSM), to assist in mapping land use and coverage together with remote sensing images is relatively recent. Most studies have used OSM to assist in sample collection for image classification or aggregated vectors of buildings, transport, and land-use and coverage as ancillary data to support mapping refinements. This study [...]
University of Sheffield Department of Geography Policy on Equality, Diversity and Inclusion for field classes
Published: 2022-01-28
Subjects: Earth Sciences, Geography, Higher Education, Scholarship of Teaching and Learning
Field-based teaching forms an important part of BSc/BA degree courses in Human Geography, Physical Geography, Environmental Science and taught postgraduate courses. The aim of this policy is to ensure that all students and teaching staff are able, and feel safe, to participate fully in compulsory and optional field classes offered by the Department of Geography. This is shared with the intention [...]
Integrating Connectivity Into Hydrodynamic Models: An Automated Open-Source Method to Refine an Unstructured Mesh Using Remote Sensing
Published: 2022-01-27
Subjects: Earth Sciences, Environmental Engineering, Numerical Analysis and Scientific Computing
Hydrodynamic models are an essential tool for studying the movement of water and other materials across the Earth surface. However, the possible questions which models can address remain limited by practical constraints on model size and resolution, particularly in fluvial and coastal environments in which hydrodynamically-relevant landscape features are topologically complex and span a wide [...]
Urban Flood Impact Assessment and Hazard Vulnerability Analysis: Iowa Case Study
Published: 2022-01-27
Subjects: Civil and Environmental Engineering, Engineering, Risk Analysis
Flooding is one of the most common natural disasters affecting communities worldwide. It is expected to persist with increasing magnitude and frequency as a result of climate change, resulting in both direct and indirect negative consequences. The flood impact assessment is considered as a key component of flood risk management strategies, such as benefit-cost analysis for mitigation planning. [...]
Powering Earth’s ancient dynamo with silicon precipitation
Published: 2022-01-27
Subjects: Earth Sciences, Geochemistry, Geophysics and Seismology
Earth's core has produced a global magnetic field for the last 4 Gyrs, presently sustained by inner core growth. Models of the core with high thermal conductivity suggest potentially insufficient power available for the geodynamo prior to inner core formation ~1 Ga. Precipitation of SiO2 from the liquid core might offer an alternative power source for the magnetic field before inner core [...]
Multidimensional Governing Equations of Matrix Flow Component of Subsurface Stormflow as Function of Bedrock Surface Geometry
Published: 2022-01-27
Subjects: Civil and Environmental Engineering, Engineering, Physical Sciences and Mathematics
Vertically Resolved Convective/Stratiform Echo Type Identification and Convectivity Retrieval for Vertically Pointing Radars
Published: 2022-01-27
Subjects: Atmospheric Sciences, Meteorology, Oceanography and Atmospheric Sciences and Meteorology
Using data from the airborne HIAPER Cloud Radar (HCR), a partitioning algorithm (ECCO-V) that provides vertically resolved convectivity and convective vs stratiform radar echo classification is developed for vertically pointing radars. The algorithm is based on the calculation of reflectivity and radial velocity texture fields that measure the horizontal homogeneity of cloud and precipitation [...]
Two decades of changing anthropogenic mercury emissions in Australia: inventory development, trends, and atmospheric implications
Published: 2022-01-27
Subjects: Atmospheric Sciences, Biogeochemistry, Environmental Health and Protection
Mercury is a toxic environmental pollutant emitted into the atmosphere by both natural and anthropogenic sources. In Australia, previous estimates of anthropogenic mercury emissions differ by up to a factor of three, with existing inventories either outdated or inaccurate and several lacking Australia-specific input data. Here, we develop a twenty-year inventory of Australian anthropogenic [...]
MODELLING EFFECTS OF FOREST FIRE AND POST-FIRE MANAGEMENT IN A CATCHMENT PRONE TO EROSION: Impacts on sediment yield
Published: 2022-01-27
Subjects: Engineering
The present paper contributes to bridging the gaps in modelling post-fire impact and mitigation measures on soil erosion. The specific aims were to predict the effects of forest fires and post-fire mitigation measures on runoff and specific sediment yield (SSY) in a river basin (Celone, S-E Italy). The Soil and Water Assessment Tool model, calibrated with field observations, was used to evaluate [...]
Deformation mechanisms and characteristics of the meta-BIFs from an early Proterozoic shear system of the Southern Granulite Terrane (SGT), India
Published: 2022-01-27
Subjects: Earth Sciences
We studied three samples of Banded Iron Formation (BIF) rocks from Southern Granulite Terrane (SGT) of India, which was metamorphosed at high-pressure granulite facies and exhumed from 40-50 km depth. We examined the microstructure, texture, and deformation mechanisms of the primary minerals (quartz, magnetite, and hematite). Microstructures, variations in size and shape of quartz grains suggest [...]
3D Convective/Stratiform Echo Type Classification and Convectivity Retrieval from Radar Reflectivity
Published: 2022-01-26
Subjects: Oceanography and Atmospheric Sciences and Meteorology
The newly developed ECCO (Echo Classification from COnvectivity) algorithm identifies convective and stratiform types of radar echo in three dimensions. It is based on the calculation of reflectivity texture - a measure of the heterogeneity of the radar echoes on each horizontal plane in a 3D Cartesian volume. Reflectivity texture is translated into convectivity, which is a newly invented [...]
Tectonics dominates over climatic and oceanographic factors in controlling the physiography of the Americas shelf-break at a continental scale
Published: 2022-01-25
Subjects: Earth Sciences, Physical Sciences and Mathematics
The continental shelf-break defines the boundary between shallow- and deep-ocean environments, and is modified by subaerial and submarine processes through geological time. The physiography of the shelf-break therefore records the cumulative influence of these processes, and dictates where, and how efficiently, particulates and pollutants are transported into the deep-ocean. Despite its [...]
Quaternary E-W extension uplifts Kythira Island and segments the Hellenic Arc
Published: 2022-01-25
Subjects: Geology, Geomorphology, Paleontology, Sedimentology, Stratigraphy, Tectonics and Structure
Several crustal and lithospheric mechanisms lead to deformation and vertical motion of the upper plate during subduction, but their relative contribution is often enigmatic. Multiple areas of the Hellenic Forearc have been uplifting since Plio-Quaternary times, yet spatiotemporal characteristics and sources of this uplift are poorly resolved. The remarkable geology and geomorphology of Kythira [...]