Waves of Accelerated Motion in a Glacier Approaching Surge: the Mini-Surges of Variegated Glacier, Alaska, U.S.A.
نویسندگان
چکیده
منابع مشابه
Wav Es of Accelerated Motion in a Glacier Approaching Surge: the Mini-surges of Variegated
Periods of dramatically accelerated motion, in which the flow velocity increases suddenly from about 55 cm/d to a peak of 1 00-300 cm/d and then decreases gradually over the course of a day, occurred repeatedly during June and July 1 978-8 1 in Variegated Glacier (Alaska), a surging-type glacier that surged in 1 982-83. These "mini-surges" appear to be related mechanistically to the main surge....
متن کاملGlacier surge mechanism: 1982-1983 surge of variegated glacier, alaska.
The hundredfold speedup in glacier motion in a surge of the kind the kind that took place in Variegated Glacier in 1982-1983 is caused by the buildup of high water pressure in the basal passageway system, which is made possible by a fundamental and pervasive change in the geometry and water-transport characteristics of this system. The behavior of the glacier in surge has many remarkable featur...
متن کاملA Theory of Glacier Surges
We propose a model of glacier flow for at least a hundred years, and a major conthat is capable of explaining temperate glacier ference (see Canadian Journal of Earth Sciences, surges. The laws of conservation of mass and vol. 6, pp. 807-1018, 1969) was devoted to their momentum are supplemented by the prescription study. Meier and Post [1969] summed up many of of a sliding law that gives the b...
متن کاملSeasonal fluctuations in the advance of a tidewater glacier and potential causes: Hubbard Glacier, Alaska, USA
Satellite imagery has been used to acquire seasonal terminus positions of tidewater Hubbard Glacier, Alaska, USA, from 1992 to 2006. During this 15 year time period, the width-averaged advance of the entire terminus has been 620m at a mean rate of 35ma. Seasonal fluctuation of the terminus ranges from 150 to 200m on average and varies spatially. A section of the terminus, near a narrow gap wher...
متن کاملA Mathematical Analysis of Glacier Surges
This paper describes the phenomena of glacier surges and presents a mathematical model based on realistic descriptions of glacier physics, which purports to describe the main features of the flow. The analysis reveals and predicts a variety of phenomena, many of which have been observed to occur, and gives explicit estimates for such quantities as surge front extent, "mini-surge" propagation sp...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 1987
ISSN: 0022-1430,1727-5652
DOI: 10.1017/s0022143000005311