Log in

Relevant bibliographies by topics / Devensian ice flow directions

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers
Reports

Academic literature on the topic 'Devensian ice flow directions'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Devensian ice flow directions.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Devensian ice flow directions"

1

Davies, Bethan J., David H. Roberts, David R. Bridgland, and Colm Ó. Cofaigh. "Dynamic Devensian ice flow in NE England: a sedimentological reconstruction." Boreas 41, no. 3 (December 1, 2011): 337–36. http://dx.doi.org/10.1111/j.1502-3885.2011.00237.x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Roman, Małgorzata. "Ice-flow directions of the last Scandinavian Ice Sheet in central Poland." Quaternary International 501 (January 2019): 4–20. http://dx.doi.org/10.1016/j.quaint.2017.11.035.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Joughin, Ian R., Mark A. Fahnestock, and Jonathan L. Bamber. "Ice flow in the northeast Greenland ice stream." Annals of Glaciology 31 (2000): 141–46. http://dx.doi.org/10.3189/172756400781820002.

Full text

Abstract:

AbstractWe have measured ice flow and detailed topography in northeastern Greenland using satellite-based synthetic-aperture radar (SAR) interferometry. The subject of this study is the large ice stream that drains this quadrant of the ice sheet. A single SAR interferogram allows the measurement of one component of motion over a several-day-long interval. We have used a set of such measurements from multiple look directions to produce a mosaic of ice-flow velocity. The resulting flow field is tied to an estimated balance-velocity distribution in slow-moving areas and assumes flow to be locally surface-parallel. The velocity field is the most detailed, consistent data-set available over a flow feature of this size. It compares with global positioning system surveyed velocity measurements at the 5 m a–1 level In the process of mapping ice-flow velocity an enhanced elevation model of the ice stream was produced. The elevation model is based on a blend of interferometrically measured short-wavelength topography and radar-altimetry-determined longer-wavelength topography. This enhanced model has improved information on local surface slope, which is useful for estimating the horizontal components of the velocity field.

APA, Harvard, Vancouver, ISO, and other styles

4

Roberts, Jason L., Roland C. Warner, and Adam Treverrow. "Inferring ice-flow directions from single ice-sheet surface images using the Radon transform." Journal of Glaciology 59, no. 213 (2013): 129–36. http://dx.doi.org/10.3189/2013jog12j042.

Full text

Abstract:

AbstractWe present a new method for extracting the direction of surface flow for ice sheets, based on the detection of flow-induced features that are visible in satellite imagery. The orientation of linear features is determined using a Radon transform and only requires a single image. The technique is demonstrated by applying it to the RADARSAT mosaic of Antarctica, over the Lambert Glacier–Amery Ice Shelf region of East Antarctica. Comparisons with both existing flow-direction fields and traced streamlines over the same area provide an evaluation of the method. We also illustrate its application to Landsat 7 imagery.

APA, Harvard, Vancouver, ISO, and other styles

5

Gemmell, Campbell, Dominic Smart, and David Sugden. "Striae and Former Ice-Flow Directions in Snowdonia, North Wales." Geographical Journal 152, no. 1 (March 1986): 19. http://dx.doi.org/10.2307/632935.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Godin, Laurent, Richard L. Brown, Aleksis Dreimanis, Gail M. Atkinson, and Derek K. Armstrong. "Analysis and reinterpretation of deformation features in the Rouge River valley, Scarborough, Ontario." Canadian Journal of Earth Sciences 39, no. 9 (September 1, 2002): 1373–91. http://dx.doi.org/10.1139/e02-059.

Full text

Abstract:

Geometry and timing of deformation affecting Ordovician bedrock and overlying Pleistocene sediments in the Rouge River valley near Scarborough, Ontario, are analysed to evaluate whether or not the structures are a result of glacial action or neotectonic activity. Extensive data on local and regional ice-flow directions are used to evaluate the kinematic compatibility between the observed faults and folds and the local ice-flow directions. Jointing and multiple episodes of faulting affect both the Ordovician bedrock and the overlying Pleistocene sediments. At one site, the bedrock is displaced by a normal fault by a minimum of 1.2 m. Crosscutting relationships constrain the majority of the faulting in the Rouge River valley as being coeval with deposition of the lower Bowmanville till during the Nissouri phase (ca. 2315 ka), and possibly younger at one locality. The youngest regional ice-flow direction is northwestward; however, local ice-flow directions are highly variable. This can be explained by local perturbation enhanced by the presence of drumlinoid features in the area. Most deformation features are compatible with local and regional ice-flow directions. Glaciotectonic ice-push and ice-thrust deformation affected the Thorncliffe Formation after about 23 ka. Although some faults appear to be kinematically incompatible with ice-flow directions, six boreholes drilled to 52 m depth revealed only minor vertical offsets of bedrock strata in the uppermost 20 m, and an absence of obvious fault offsets deeper, precluding the possibility that the faults observed in the surface exposures were caused by deep-seated neotectonic stresses.

APA, Harvard, Vancouver, ISO, and other styles

7

Gipp, Michael R. "Lift-off moraines: markers of last ice-flow directions on the Scotian Shelf." Canadian Journal of Earth Sciences 37, no. 12 (December 1, 2000): 1723–34. http://dx.doi.org/10.1139/e00-066.

Full text

Abstract:

Lift-off moraines are acoustically incoherent, subparallel ridges observed on sidescan sonograms and high-resolution reflection seismic profiles on the southeastern continental margin of Canada. They are up to 3 m high, 2080 m wide, and are commonly overlain by stratified proglacial sediments. Although little is known about them, detailed study of high-resolution seismic profiles from the Emerald Basin and the LaHave Basin, on the Scotian Shelf, show that their height:width ratio varies with the sounderseabed separation, suggesting that the ridges may be narrower than they appear. Their morphology is similar to DeGeer moraines or cross-valley moraines, which form perpendicular to ice-flow direction. As their orientations can be estimated at the intersection of seismic lines, they can be used to estimate ice-flow directions. Since proglacial sediments are draped directly over top of them, they are assumed to record the direction of last ice flow. This directional data suggests that ice retreated not only northward (to Nova Scotia), but also toward local topographic highs on the continental shelf, which acted as anchoring points for ice rises around both the Emerald and LaHave Basins. This pattern of ice-flow directions suggests that ice flowed from the high ground of banks, converging into basin deeps, suggesting that small moraines within the basins are probably of interlobate origin.

APA, Harvard, Vancouver, ISO, and other styles

8

Robert, Barry L. "Modeling the Cordilleran Ice Sheet." Géographie physique et Quaternaire 45, no. 3 (December 13, 2007): 287–99. http://dx.doi.org/10.7202/032876ar.

Full text

Abstract:

ABSTRACT A time-dependent ice flow model is used to provide detailed reconstructions of ice growth and retreat for the southern portion of the Late Wisconsinan Cordilleran Ice Sheet. The two-dimensional, time-dependent model provides ice surface elevations and flow directions at a grid spacing of 15 km. Input to the model includes subglacial topography, a net mass balance function, and two ice flow parameters. The net mass balance function uses a polynomial equation to estimate equilibrium line altitude (ELA) across the study area. A quadratic equation is then used to provide net mass balance values as a function of elevation relative to the ELA. Late Wisconsinan glacial conditions are simulated by systematically lowering the ELA. The general timing of the model ice advance and retreat is tested against radiocarbon dated localities which place limits on the ice sheet's areal extent for different times during the Late Wisconsinan glaciation. In addition, glacial-geologic evidence directly attributable to the latest Cordilleran Ice Sheet is used in assessing the model reconstructions. Results from these experiments show that an ice growth and retreat chronology consistent with the limiting radiocarbon dates can be generated using the model, and provide information on flow directions and ice growth and retreat patterns.

APA, Harvard, Vancouver, ISO, and other styles

9

Merritt, Jon W., Maxine C. Akhurst, Ian P. Wilkinson, James B. Riding, Emrys R. Phillips, Richard A. Smith, Andrew Finlayson, and Mark T. Dean. "The Late Pleistocene Afton Lodge Clay Formation, Ayrshire, Scotland: evidence for Early to Middle Devensian climatic changes and Late Devensian onshore ice flow and rafting from the Firth of Clyde." Proceedings of the Geologists' Association 125, no. 2 (March 2014): 195–214. http://dx.doi.org/10.1016/j.pgeola.2013.12.004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

MERRITT, Jon W., Adrian M. HALL, John E. GORDON, and E. Rodger CONNELL. "Late Pleistocene sediments, landforms and events in Scotland: a review of the terrestrial stratigraphic record." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 110, no. 1-2 (March 2019): 39–91. http://dx.doi.org/10.1017/s1755691018000890.

Full text

Abstract:

ABSTRACTLithostratigraphical studies coupled with the development of new dating methods has led to significant progress in understanding the Late Pleistocene terrestrial record in Scotland. Systematic analysis and re-evaluation of key localities have provided new insights into the complexity of the event stratigraphy in some regions and the timing of Late Pleistocene environmental changes, but few additional critical sites have been described in the past 25 years. The terrestrial stratigraphic record remains important for understanding the timing, sequence and patterns of glaciation and deglaciation during the last glacial/interglacial cycle. Former interpretations of ice-free areas in peripheral areas during the Last Glacial Maximum (LGM) are inconsistent with current stratigraphic and dating evidence. Significant challenges remain to determine events and patterns of glaciation during the Early and Middle Devensian, particularly in the context of offshore evidence and ice sheet modelling that indicate significant build-up of ice throughout much of the period. The terrestrial evidence broadly supports recent reconstructions of a highly dynamic and climate-sensitive British–Irish Ice Sheet (BIIS), which apparently reached its greatest thickness in Scotland between 30 and 27ka, before the global LGM. A thick (relative to topography) integrated ice sheet reaching the shelf edge with a simple ice-divide structure was replaced after the LGM by a much thinner one comprising multiple dispersion centres and a more complex flow structure.

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Devensian ice flow directions"

1

Walden, John. "The use of mineral magnetic analysis in the study of glacial diamicts." Thesis, University of Wolverhampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259185.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Collins, Karen Elizabeth. "Reconstruction of late quaternary ice-flow directions, east central Ellesmere Island, Northwest Territory." Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6718.

Full text

Abstract:

This study identifies Late Quaternary glacial ice-flow direction in east-central Ellesmere Island, N.W.T., by the study of its composition and its relation to bedrock sources. The spatial distribution of five till types suggests a hypothesis which attempts to reconcile the Innuitian Ice Sheet model of Blake with the Franklin Ice Complex model of England. Glaciers draining from ice sheets in northern Ellesmere Island and Greenland filled Kane Basin and flowed southward toward Smith Sound. When this southward-flowing ice reached the bottleneck at Smith Sound (40 km wide), it overrode the adjacent landmasses of Pim Island and Cape Herschel and forced Buchanan Bay ice southward through the channel that is now occupied by Rice Strait. Southward-flowing ice continued to drain towards Baffin Bay, overriding the coastal areas of Nares Strait at Wade Point and Cape Isabella. The results presented here partially support the Innuitian ice sheet hypothesis, but do not negate the Franklin Ice Complex model. (Abstract shortened by UMI.)

APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Devensian ice flow directions"

1

The CHP Book of Amazing Experiments: You Can Do at Home (I Can Do That! Series). Niagra Falls, New York, USA: Hayes Publishing Ltd., 1985.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

The CHP Book of Amazing Experiments: You Can Do at Home. Dh Audio, 1986.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Devensian ice flow directions"

1

Stokes, C. R. "GLACIAL LANDFORMS, ICE SHEETS | Evidence of Glacier Flow Directions." In Encyclopedia of Quaternary Science, 895–908. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-444-53643-3.00092-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Devensian ice flow directions"

1

Li, Xing, and Chao Wang. "Study on Force and Movement of Unconstrained Ice Fronting a Propeller." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77260.

Full text

Abstract:

In order to simulate the movement of ice more accurately, this paper use overlapping grid methods combined with DFBI model to calculate the mutual interaction between an unconstrained ice cube and propeller, then the movement and force of the ice under the influence of propeller suction effect are analyzed. In the computational process, different working conditions are carried out by altering propeller rotation speed and ice-propeller radical distance. According to the computational results, when ice move near to the propeller disk, the force peak value in 3 directions will appear; and when the flow speed remain constant, the bigger of advance velocity coefficient, the higher probability of ice-propeller crashing.

APA, Harvard, Vancouver, ISO, and other styles

2

Ejakov, Mikhail A. "Modeling of Axial and Circumferential Ring Pack Lubrication." In ASME 2001 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-ice-433.

Full text

Abstract:

Abstract The ring-pack lubrication is a complicated physical process involving multiple physical phenomena. This paper presents an attempt to model the ring-pack lubrication in three-dimensional space, considering the ring-bore structure interaction, bore distortion, ring-twist, piston secondary motion, non-Newtonian lubricant behavior, and ring/bore asperity contacts. The physics of the model includes the interface between the structure of the ring, oil lubricant, and the structure of the cylinder liner. The ring is modeled as a three-dimensional FEA model with the nodes along the ring circumference. The ring face orientation changes circumferentially depending on ring geometry as well as piston tilt angle and three-dimensional ring twist angle at every crank angle degree. The oil lubrication is modeled with the Reynolds equation with shear thinning and temperature dependent oil viscosity and with or without the flow factors. The cylinder liner description allows three-dimensional bore distortion and ring/liner asperity contact to be modelled. The key of the analysis is solving simultaneously at every crank angle increment a set of coupled linear and non-linear equations of ring structure, ring face lubrication, bore distortion, and asperity contact. The model predicts variations of the ring-pack lubrication in the axial and circumferential directions. Using the hydrodynamic lubrication model coupled with the asperity contact model allows calculations of the friction forces due to asperity contact (boundary and mixed lubrication) and oil film interactions (hydrodynamic and mixed lubrication). The transition from hydrodynamic lubrication to boundary lubrication through mixed lubrication is determined interactively based on ring / liner surface properties, ring loads, and lubrication properties. The new friction sub-module calculates axial and circumferential variation of both types of friction forces as well as total friction. The asperity contact induced friction forces and asperity contact pressure can further be used for ring wear calculations. The developed model has been applied to determine the performance of a production engine ring-pack. The influence of different phenomena affecting the ring-pack performance has been analyzed and compared.

APA, Harvard, Vancouver, ISO, and other styles

3

Dana, Scott R., and Douglas E. Adams. "Dynamics-Based Health Monitoring of Wind Turbine Rotor Blades Using Integrated Inertial Sensors." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71215.

Full text

Abstract:

By analyzing the rotor structural dynamic response of a wind turbine, this research aims to improve decision making in operation and maintenance. To illustrate the potential of this measurement technique, a horizontal axis wind turbine test-bed is used to experimentally simulate the rotor structural dynamic response to uniform flow as well as horizontal and vertical shear flow across the rotor plane. The structural dynamic characteristics of the wind turbine rotor are described in the context of modal analysis where each mode of vibration occurs at a particular frequency with a particular modal deflection shape. These deflection shapes facilitate the effectiveness with which a given aerodynamic load couples into the rotor to produce mechanical power in addition to vibrations of the rotor. Operational modal analysis is used to explore the effects of changes in the wind state on the sensitivity of condition monitoring data to two types of damages in the turbine rotor, ice accretion and blade root cracking. Additionally, the degree to which various damage mechanisms can be identified in the presence of yaw and pitch set points is analyzed. It is shown that certain frequencies in the measured response using the flap, edgewise, and span directions of the wind turbine are sensitive to a change in condition of the rotor for use in detecting that type of damage. By analyzing the changes in the modal response amplitudes, the type of damage present in the rotor system can also be classified.

APA, Harvard, Vancouver, ISO, and other styles

4

Sun, Pengnan, Furen Ming, Aman Zhang, and Xiongliang Yao. "Investigation of Coalescing and Bouncing of Rising Bubbles Under the Wake Influences Using SPH Method." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23789.

Full text

Abstract:

In the exploiting and processing of submarine energy, such as natural gas, petroleum and combustible ice, it is always accompanied with multi-phase flow of large density and viscosity ratio, like bubbly flows. The essential mentioned subjects are bubbles rising in the viscous medium, the coupling effects among rising bubbles. In this paper, SPH method is used to simulate the interaction between two bubbles, where the focusing problem is the interface between gas and liquid. The multiphase flow characteristics are greatly influenced by surface tension and viscous force especially when the characteristic length scales are relatively small. As many experiments in previous literatures indicate, the rising bubbles are often followed by a long tail which greatly affects the shape and motion path of a single bubble and bubble groups. Though Boundary Element Method (BEM) may be well used to simulate the movement and deformation of a single bubble, there are still many challenges in simulating the bubble interactions like coalescing and bouncing. The traditional Smoothed Particle Hydrodynamics (SPH) method was well employed in simulating moving boundary and large deformation problems in single-phase problems, but in the ocean engineering, the density and viscosity ratio at the gas-liquid interface may be up to nearly 1000 and 100 respectively, which will always cause unphysical penetrations and pressure fluctuations at the gas-liquid interface. The present improved SPH algorithm based on volume approximation can guarantee the continuous conditions at the gas-liquid interface. Through a staggered particle distribution and an appropriate re-mesh, the process of rising, pulsing and jet of a single bubble is simulated, which agree well with that of experiments in the existing literatures. Besides, the trails of the rising bubble and interactions among bubbles are studied. On these bases, the coalescing and bouncing of two bubbles posited at different directions are simulated, which are consistent well with the experiment carried out in previous literatures. The present studies aims to provide a reference for the industrialized productions.

APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Devensian ice flow directions"

1

Thompson, F. J., and R. A. Klassen. Ice Flow Directions and Drift Composition, Central Labrador. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/120443.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Jackson, L. E., and T. D. Mackay. Glacial Limits and Ice-Flow Directions of the Last Cordilleran Ice Sheet in Yukon Territory Between 60 and 63 Degrees North. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/131319.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!