Waves on Glacier Beds
نویسندگان
چکیده
منابع مشابه
Surface "Waves" on Byrd Glacier, Antarctica
Byrd Glacier has one of the largest ice catchment areas in Antarctica, delivers more ice to the Ross Ice Shelf than any other ice stream, and is the fastest of these ice streams. A force balance, combined with a mass balance, demonstrates that stream flow in Byrd Glacier is transitional from sheet flow in East Antarctica to shelf flow in the Ross Ice Shelf. The longitudinal pulling stress, calc...
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A wave traveling upward through a particle bed is observed to steepen and form a shock as the surface is approached. This steepening is due to the increase in the local speed of sound that is induced by the local pressure increase in the upward moving phase of the wave behind the wave front. The pressure increase leads to an increase in the local coordination number which in turn increases the ...
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A time-dependent extension of the reduced wave equation of Berkhoff is developed for the case of waves propagating over a bed consisting of ripples superimposed on an otherwise slowly varying mean depth which satisfies the mild-slope assumption. The ripples are assumed to have wavelengths on the order of the surface wavelength but amplitudes which scale as a small parameter along with the botto...
متن کاملSurface Waves and Pattern Formation in Vibrated Granular Beds
We present numerical simulations of surface waves in vibrated granular systems. For the simulations we use an event driven (ED) procedure with a non-constant restitution coeecient. The important advantage of a non-constant restitution coeecient is that it allows to circumvent the \inelastic collapse", i.e. the divergence of collision frequency, usually observed in ED simulations of dense and di...
متن کاملA model for turbulent hydraulic fracture and application to crack propagation at glacier beds
[1] Glaciological observations of under‐flooding suggest that fluid‐induced hydraulic fracture of an ice sheet from its bed sometimes occurs quickly, possibly driven by turbulently flowing water in a broad sheet flow. Taking the approximation of a fully turbulent flow into an elastic ice medium with small fracture toughness, we derive an approximate expression for the crack‐tip speed, opening d...
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ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 1989
ISSN: 0022-1430,1727-5652
DOI: 10.3189/s0022143000004469