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Professor Jim Mcelwaine's Outputs (103)

Overlapped Phased Array Antenna for Avalanche Radar (2017)
Journal Article
Ardeshir Tanha, M., Brennan, P. V., Ash, M., Kohler, A., & McElwaine, J. (2017). Overlapped Phased Array Antenna for Avalanche Radar. IEEE Transactions on Antennas and Propagation, 65(8), 4017-4026. https://doi.org/10.1109/tap.2017.2712183

Snow avalanche is a natural phenomenon, which annually causes infrastructure damage and leads to human casualties in many countries all over the world. As a result, a detailed hazard mapping is required to be able to understand the avalanche risk lev... Read More about Overlapped Phased Array Antenna for Avalanche Radar.

The hottest hot Jupiters may host Atmospheric Dynamos (2017)
Journal Article
Rogers, T., & McElwaine, J. (2017). The hottest hot Jupiters may host Atmospheric Dynamos. Astrophysical Journal Letters, 841(2), Article L26. https://doi.org/10.3847/2041-8213/aa72da

Hot Jupiters have proven themselves to be a rich class of exoplanets that test our theories of planetary evolution and atmospheric dynamics under extreme conditions. Here, we present three-dimensional magnetohydrodynamic simulations and analytic resu... Read More about The hottest hot Jupiters may host Atmospheric Dynamos.

Persistent northward North Atlantic tropical cyclone track migration over the past five centuries (2016)
Journal Article
Baldini, L. M., Baldini, J. U. L., McElwaine, J., Frappier, A. B., Asmerom, Y., Liu, K. B., Prufer, K., Ridley, H. E., Polyak, V., Kennett, D. J., Macpherson, C. G., Aquino, V. V., Awe, J., & Breitenbach, S. F. M. (2016). Persistent northward North Atlantic tropical cyclone track migration over the past five centuries. Scientific Reports, 6, Article 37522. https://doi.org/10.1038/srep37522

Accurately predicting future tropical cyclone risk requires understanding the fundamental controls on tropical cyclone dynamics. Here we present an annually-resolved 450-year reconstruction of western Caribbean tropical cyclone activity developed usi... Read More about Persistent northward North Atlantic tropical cyclone track migration over the past five centuries.

The dynamics of surges in the 3 February 2015 avalanches in Vallée de la Sionne (2016)
Journal Article
Köhler, A., McElwaine, J., Sovilla, B., Ash, M., & Brennan, P. (2016). The dynamics of surges in the 3 February 2015 avalanches in Vallée de la Sionne. Journal of Geophysical Research: Earth Surface, 121(11), 2192-2210. https://doi.org/10.1002/2016jf003887

Five avalanches were artificially released at the Vallée de la Sionne test site in the west of Switzerland on 3 February 2015 and recorded by the GEOphysical flow dynamics using pulsed Doppler radAR Mark 3 radar system. The radar beam penetrates the... Read More about The dynamics of surges in the 3 February 2015 avalanches in Vallée de la Sionne.

Phase diagram for inertial granular flows (2016)
Journal Article
DeGiuli, E., McElwaine, J., & Wyart, M. (2016). Phase diagram for inertial granular flows. Physical Review E, 94(1), Article 012904. https://doi.org/10.1103/physreve.94.012904

Flows of hard granular materials depend strongly on the interparticle friction coefficient μp and on the inertial number I, which characterizes proximity to the jamming transition where flow stops. Guided by numerical simulations, we derive the phase... Read More about Phase diagram for inertial granular flows.

Modelling gravity currents without an energy closure (2016)
Journal Article
Konopliv, N., Llewellyn-Smith, S., McElwaine, J., & Meiburg, E. (2016). Modelling gravity currents without an energy closure. Journal of Fluid Mechanics, 789, 806-829. https://doi.org/10.1017/jfm.2015.755

We extend the vorticity-based modelling approach of Borden & Meiburg (Phys. Fluids, vol. 25 (10), 2013, 101301) to non-Boussinesq gravity currents and derive an analytical expression for the Froude number without the need for an energy closure or any... Read More about Modelling gravity currents without an energy closure.

Was millennial scale climate change during the Last Glacial triggered by explosive volcanism? (2015)
Journal Article
Baldini, J., Brown, R., & McElwaine, J. (2015). Was millennial scale climate change during the Last Glacial triggered by explosive volcanism?. Scientific Reports, 5, Article 17442. https://doi.org/10.1038/srep17442

The mechanisms responsible for millennial scale climate change within glacial time intervals are equivocal. Here we show that all eight known radiometrically-dated Tambora-sized or larger NH eruptions over the interval 30 to 80 ka BP are associated w... Read More about Was millennial scale climate change during the Last Glacial triggered by explosive volcanism?.

Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex (2014)
Journal Article
Wilson, J., Eke, V., Massey, R., Elphic, R., Jolliff, B., Lawrence, D., …Teodoro, L. (2015). Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex. Journal of Geophysical Research: Planets, 120(1), 92-108. https://doi.org/10.1002/2014je004719

We reconstruct the abundance of thorium near the Compton-Belkovich Volcanic Complex on the Moon, using data from the Lunar Prospector Gamma Ray Spectrometer. We enhance the resolution via a pixon image reconstruction technique and find that the thori... Read More about Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex.

Heat transport and pressure buildup during carbon dioxide injection into depleted gas reservoirs (2014)
Journal Article
Mathias, S., McElwaine, J., & Gluyas, J. (2014). Heat transport and pressure buildup during carbon dioxide injection into depleted gas reservoirs. Journal of Fluid Mechanics, 756, 89-109. https://doi.org/10.1017/jfm.2014.348

In this article, a two-layer vertical equilibrium model for the injection of carbon dioxide into a low-pressure porous reservoir containing methane and water is developed. The dependent variables solved for include pressure, temperature and $\def \xm... Read More about Heat transport and pressure buildup during carbon dioxide injection into depleted gas reservoirs.

Evaluation of a snow avalanche possibly triggered by a local earthquake at Vallée de la Sionne, Switzerland (2014)
Journal Article
Pérez-Guillén, C., Tapia, M., Furdada, G., Suriñach, E., McElwaine, J., & Hiller, M. (2014). Evaluation of a snow avalanche possibly triggered by a local earthquake at Vallée de la Sionne, Switzerland. Cold Regions Science and Technology, 108, 149-162. https://doi.org/10.1016/j.coldregions.2014.07.007

Snow avalanches are moving sources of infrasonic and seismic energy. They can be triggered by many different mechanisms that include the shaking produced by earthquakes. The forces induced by an earthquake can cause an increase in the load down the s... Read More about Evaluation of a snow avalanche possibly triggered by a local earthquake at Vallée de la Sionne, Switzerland.

Bulldozing of granular material. (2014)
Journal Article
Sauret, A., Balmforth, N., Caulfield, C., & McElwaine, J. (2014). Bulldozing of granular material. Journal of Fluid Mechanics, 748, 143-174. https://doi.org/10.1017/jfm.2014.181

We investigate the bulldozing motion of a granular sandpile driven forwards by a vertical plate. The problem is set up in the laboratory by emplacing the pile on a table rotating underneath a stationary plate; the continual circulation of the bulldoz... Read More about Bulldozing of granular material..