Computer Science – Sound
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3324504m&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 24, CiteID L24504
Computer Science
Sound
5
Cryosphere: Glaciers, Hydrology: Erosion, Hydrology: Sediment Transport (4558)
Scientific paper
Taku Glacier in southeast Alaska has advanced 7.5 km over the last 115 years, overriding its own glaciomarine and outwash sediments. We have documented rapid erosion of these sediments by comparing radio echo soundings (RES) along five transects (2003-2005) to earlier RES surveys (1989 and 1994) and to early bathymetric surveys of the proglacial fjord. Erosion rates, $\dot{E, reached 3.9 +/- 0.8 m a-1 (1989-2003) at a distance, L, of 5.4 km from the 2003 terminus, where ice thickness, H, is 610 m. $\dot{E averaged 2.0 +/- 0.1 m a-1 (1940-2005) at L = 3 km (H = 350 m), and 1.5 +/- 0.2 m a-1 (1952-2005) at L = 1.5 km (H = 250 m). Detailed mapping over a 4 km2 area of the terminus revealed a deeply incised channel in line with a major outlet stream. Glaciofluvial processes must play the dominant role in the subglacial erosion and removal of these unlithified sediments.
Bucki Adam K.
Kuriger Elsbeth M.
Motyka Roman J.
Truffer Martin
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