Subglacial bed form morphology controlled by ice speed and sediment thickness
نویسندگان
چکیده
منابع مشابه
Subglacial floods beneath ice sheets.
Subglacial floods (jökulhlaups) are well documented as occurring beneath present day glaciers and ice caps. In addition, it is known that massive floods have occurred from ice-dammed lakes proximal to the Laurentide ice sheet during the last ice age, and it has been suggested that at least one such flood below the waning ice sheet was responsible for a dramatic cooling event some 8000 years ago...
متن کاملSubglacial hydrology and ice stream margin locations
Fast flowing ice streams in West Antarctica are separated from the nearly stagnant ice in the adjacent ridge by zones of highly localized deformation known as shear margins. It is presently uncertain what mechanisms control the location of shear margins, and possibly allow them to migrate. In this paper we show how subglacial hydrological processes can select the shear margin location, leading ...
متن کاملComment on ‘‘A quantitative framework for interpretation of basal ice facies formed by ice accretion over subglacial sediment’’ by Poul Christoffersen et al
[1] Frost heave is the term given to the deformation at the Earth’s surface that is caused by the formation and growth of segregated ice lenses in permafrost and seasonally frozen ground. Efforts to understand and predict the characteristics of solidification in porous media led O’Neill and Miller [1985] to produce the first comprehensive and tractable model for the thicknesses, spacings and gr...
متن کاملSediment patches, sediment supply, and channel morphology
Bed surface particle size patchiness may play a central role in bedload and morphologic response to changes in sediment supply in gravel-bed rivers. Here we test a 1-D model (from Parker ebook) of bedload transport, surface grain size, and channel profile with two previously published flume studies that documented bed surface response, and specifically patch development, to reduced sediment sup...
متن کاملSediment patches, sediment supply, and channel morphology
Bed surface particle size patchiness may play a central role in bedload and morphologic response to changes in sediment supply in gravel-bed rivers. Here we test a 1-D model (from Parker ebook) of bedload transport, surface grain size, and channel profile with two previously published flume studies that documented bed surface response, and specifically patch development, to reduced sediment sup...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2016
ISSN: 0094-8276
DOI: 10.1002/2016gl069558