Jerome A. Neufeld
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View article: Response of a gravity current in a porous medium to a perturbation of the permeability field
Response of a gravity current in a porous medium to a perturbation of the permeability field Open
One of the challenges with modelling subsurface flows is the uncertainty in measurements of geological properties, mostly due to limited resolution in observation methods. Many subsurface flows can be modelled as a gravity current, which, …
View article: Bubbling forth on thin films
Bubbling forth on thin films Open
The motion of a bubble of negligible viscosity, such as air, forced down a tube filled with a viscous fluid which wets the walls of the tube has become a classic of the fluid dynamical literature. The differential motion of the bubble and …
View article: Scraping of a viscoplastic fluid to model mountain building
Scraping of a viscoplastic fluid to model mountain building Open
We present a thin-film viscoplastic fluid model of a mountain range, where a uniform fluid layer is deformed by a vertical backstop moving at constant speed. This represents a simplification of the geometry in subduction zones, where an ov…
View article: Transient Joule–Thomson cooling during CO<sub>2</sub> injection in depleted reservoirs
Transient Joule–Thomson cooling during CO<sub>2</sub> injection in depleted reservoirs Open
The injection of ${\rm CO}_2$ into depleted reservoirs carries the potential for significant Joule–Thomson cooling, when dense, supercritical ${\rm CO}_2$ is injected into a strongly under-pressured reservoir. The resulting low temperature…
View article: Lunar crustal formation by melt migration and differentiation within a stagnant lid.
Lunar crustal formation by melt migration and differentiation within a stagnant lid. Open
The lunar anorthosite highlands, composed of 90 wt% anorthite (Ca-rich plagioclase), represent the Moon’s primary crust [1], which formed during the solidification of a magma ocean following the Moon-forming giant impact between the …
View article: The direction of core soldification in asteroids: implications for dynamo generation.
The direction of core soldification in asteroids: implications for dynamo generation. Open
Paleomagnetic studies of meteorites over the past two decades have revealed that the cores of multiple meteorite parent bodies, including those of certain chondritic groups, generated dynamo fields as they crystallised. However, uncertaint…
View article: Joule-Thomson cooling and phase transitions during CO2 injection in depleted reservoirs
Joule-Thomson cooling and phase transitions during CO2 injection in depleted reservoirs Open
Depleted oil and gas reservoirs are attractive sites for CO2 sequestration. However, the injection of CO2 into depleted reservoirs carries the potential for significant Joule-Thomson cooling, when dense, supercritical CO2 is injected …
View article: The effects of heterogeneity on solute transport in porous media: anomalous dispersion
The effects of heterogeneity on solute transport in porous media: anomalous dispersion Open
Mixing of solute in sub-surface flows, for example in the leakage of contaminants into groundwater, is quantified by a dispersion coefficient that depends on the dispersivity of the medium and the transport velocity. Many previous models o…
View article: A shallow approximation for ice streams sliding over strong beds
A shallow approximation for ice streams sliding over strong beds Open
Ice streams are regions of rapid ice sheet flow characterised by a high degree of sliding over a deforming bed. The shallow shelf approximation (SSA) provides a convenient way to obtain closed-form approximations of the velocity and flux i…
View article: Evolution of an elastic blister in the presence of sloping topography
Evolution of an elastic blister in the presence of sloping topography Open
The propagation of a finite blister of fluid beneath an elastic sheet is controlled by the local dynamics at the peeling periphery of the current. Previous works have described constant volume elastic blisters by considering the peeling du…
View article: Towards modelling of corrugation ridges at ice-sheet grounding lines
Towards modelling of corrugation ridges at ice-sheet grounding lines Open
Improvements in the resolution of sea-floor mapping techniques have revealed extremely regular, sub-metre-scale ridge landforms produced by the tidal flexure of ice-shelf grounding lines as they retreated very rapidly (i.e. at rates of sev…
View article: A shallow approximation for ice streams sliding over strong beds
A shallow approximation for ice streams sliding over strong beds Open
Ice streams are regions of rapid ice sheet flow characterised by a high degree of sliding over a deforming bed. The Shallow Shelf Approximation (SSA) provides a convenient way to obtain closed-form approximations of the velocity and flux i…
View article: Experimental insights into gravity-driven flows and mixing in layered porous media
Experimental insights into gravity-driven flows and mixing in layered porous media Open
The heterogeneity of permeability in a porous medium considerably alters the behaviour of density-driven flows from what is observed in a medium of homogeneous permeability, and significantly enhances the mixing between the dense and light…
View article: Shear dilation of subglacial till results in time-dependent sliding laws
Shear dilation of subglacial till results in time-dependent sliding laws Open
The dynamics of glacial sliding over water-saturated tills are poorly constrained and difficult to capture realistically in large-scale models. Experiments characterize till as a plastic material with a pressure-dependent yield stress, but…
View article: Comment on tc-2022-222
Comment on tc-2022-222 Open
Abstract. Improvements in the resolution of seafloor mapping techniques have revealed extremely regular, sub-meter scale ridge landforms produced by the tidal flexure of ice-shelf grounding lines as they retreated very rapidly (i.e., at ra…
View article: Towards modelling of corrugation ridges at ice-sheet grounding lines
Towards modelling of corrugation ridges at ice-sheet grounding lines Open
Improvements in the resolution of seafloor mapping techniques have revealed extremely regular, sub-meter scale ridge landforms produced by the tidal flexure of ice-shelf grounding lines as they retreated very rapidly (i.e., at rates of sev…
View article: Axisymmetric gravity currents in anisotropic porous media
Axisymmetric gravity currents in anisotropic porous media Open
We explore the motion of an axisymmetric gravity current in an anisotropic porous medium in which the horizontal permeability is larger than the vertical permeability. It is well known that the classical axisymmetric gravity current suppli…
View article: Early asymmetric growth of planetary stagnant lids
Early asymmetric growth of planetary stagnant lids Open
Convection within planetary bodies is often modelled using a temperature-dependent rheology which, when cooled from the surface, naturally leads to the formation of a so-called stagnant lid at the cold outer surface. However, for sufficien…
View article: The Microstructural Record of Convection in the Little Minch Sill Complex, Scotland
The Microstructural Record of Convection in the Little Minch Sill Complex, Scotland Open
Detailed microstructural analysis of three basaltic sills of the Little Minch Sill Complex demonstrates that convection leaves a detectable signature in fully solidified bodies. The presence of dense clusters of equant grains of olivine an…
View article: The Microstructural Record of Emplacement, Inflation and Convection of Sills, Lava Flows and Lakes
The Microstructural Record of Emplacement, Inflation and Convection of Sills, Lava Flows and Lakes Open
The stratigraphic variation of plagioclase grain shape in the marginal regions of tabular bodies of magma provides a record of the balance of heat loss into the surroundings and heat brought into the body by magma flow during inflation and…
View article: Gunwale bobbing
Gunwale bobbing Open
It has been shown experimentally that small droplets, bouncing on a vibrated\nliquid bath, can "walk" across the surface due to their interaction with their\nown wave-field. Gunwale bobbing is a life-size instance of this phenomena in\nwhi…
View article: A time-dependent sliding law for granular till
A time-dependent sliding law for granular till Open
<p>The dynamics of soft-bedded glacial sliding over water-saturated tills are poorly constrained and difficult to realistically capture in large scale models. While experiments characterise till as a plastic material with a pressure …
View article: Exploring the dynamics of inward core solidification using analogue tank experiments
Exploring the dynamics of inward core solidification using analogue tank experiments Open
<p>Given their small sizes and low central pressures, the cores of most asteroids are expected to have started crystallising at the core mantle boundary (CMB) instead of at their centre, as is the case for the Earth. This so-called t…
View article: Erosional dynamics of a river driven by groundwater seepage
Erosional dynamics of a river driven by groundwater seepage Open
<div> <div> <div>Seepage erosion occurs when groundwater emerges at the surface of a granular heap. A</div> <div>spring forms and feeds a river which entrains sediments, thus changing the groundwater</div&g…
View article: Asymmetric growth of planetary stagnant lids
Asymmetric growth of planetary stagnant lids Open
<p>Both the Moon<sup>1</sup> and Mars<sup>2</sup> are known to have significant degree-1 variations in their crustal thicknesses, with the Moon's far side and Mars's southern hemisphere having far thicker crus…
View article: Horizontal miscible displacements through porous media: the interplay between viscous fingering and gravity segregation
Horizontal miscible displacements through porous media: the interplay between viscous fingering and gravity segregation Open
We consider miscible displacements in two-dimensional homogeneous porous media where the displacing fluid is less viscous and has a different density than the displaced fluid. We find that the dynamics evolve through nine possible regimes …
View article: Formation of the Lunar Primary Crust From a Long‐Lived Slushy Magma Ocean
Formation of the Lunar Primary Crust From a Long‐Lived Slushy Magma Ocean Open
Classical fractional crystallization scenarios of early lunar evolution suggest crustal formation by the flotation of light anorthite minerals from a liquid magma ocean. However, this model is challenged by the Myr age range of primitive f…