Preliminary hydrography and historic terminal changes of Columbia Glacier, Alaska

Post, Austin

doi:10.3133/ofr75491

Cited by 88 publications

(105 citation statements)

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“…It indicates a shoal near the grounding line, as has been observed in tide-water glaciers (Post, 1975;Powell, 1981). In a setting similar to Strandline Lake, Booth (in press) described valley-constricting embankments at the mouths of alpine valleys which were dammed by the Puget lobe of the Cordilleran ice sheet.…”

Section: Discussionmentioning

confidence: 97%

A History of Jökulhlaups from Strandline Lake, Alaska, U.S.A.

Sturm

Benson

1985

J. Glaciol.

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ABSTRACT. JOkulhlaups, also known as outburst floods, have occurred every I to 5 years from Strandline Lake, one of the largest glacier-dammed lakes in North America. The development of a distinct calving embayment in the lobe of Triumvirate Glacier which dams the lake, as well as the filling of a number of supraglacier pools, appear to be reliable precursors to a jOkulhlaup. Analysis of contour maps made from photographs taken immediately before and after the jOkulhlaup of 17 September 1982 indicate that over 95% of the lake drains, a volume of approximately 7 x 10 8 m 3 of water. The glacier lobe which dams the lake fractures and subsides during a jOkulhlaup, indicating that the release mechanism is hydrostatic lifting of the ice off of a subglacial spillway. Evidence from the ice-free margins of the glacier suggests that the spillway may be controlled by bedrock. Large variation in the refilling period of Strandline Lake indicates that the subglacial drainage tunnels can remain open for as much as a few years after a jOkulhlaup, before they become sealed by sediments and/or glacier ice. RESUME. Histoire des vidanges sous-glaciares du Strand line Lake. Alaska. U.S.A. Des vidanges brutales du

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Section: Discussionmentioning

confidence: 97%

A History of Jökulhlaups from Strandline Lake, Alaska, U.S.A.

Sturm

Benson

1985

J. Glaciol.

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“…Rapid flow in grounded tidewater glaciers, which has sometimes been called "continuous surging," is an aspect of the phenomenon that has not been extensively studied. A detailed investigation of Columbia Glacier (large tidewater glacier near Valdez, Alaska) in a multiyear U.S. Geological Survey project by Meier and others [Post, 1975 …”

Section: Introductionmentioning

confidence: 99%

Mechanical and hydrologic basis for the rapid motion of a large tidewater glacier: 1. Observations

Meier¹,

Lundstrom²,

Stone³

et al. 1994

J. Geophys. Res.

132

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“…Recognition of a distinct cycle of dynamically controled advance and retreat of tide-water glaciers began with the work of Hoppe (1959) and was developed by Post (1975) and Meier and Post (1987). The tide-water glacier cycle consists of three phases:…”

Section: Discussionmentioning

confidence: 99%

Non-climatic control of glacier-terminus fluctuations in the Wrangell and Chugach Mountains, Alaska, U.S.A.

et al. 1991

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ABSTRACT. Fluctuations of glacier termini were studied in two regions in Alaska. In the Wrangell Mountains, 15 glaciers on Mount Wrangell, an active volcano, have been monitored over the past 30 years by surveying, photogrammetry and satellite. Results, which are consistent between different methods of measurement, indicate that the termini of most glaciers were stationary or retreating slightly. However, the termini of the 30 km long Ahtna Glacier and the smaller Center and South MacKeith Glaciers began to advance in the early 1960s and have advanced steadily between 5 and 18 m a-I since then. These three glaciers flow from the active North Crater, where increased volcanic heating since 1964 has melted over 7 x 10 7 m 3 of ice. We suspect that volcanic meltwater has changed the basal conditions for the three glaciers, resulting in their advance.The terminus fluctuations of six tide-water and near-tide-water glaciers in College Fjord, Prince William Sound, have been monitored since 1931 by surveying, photogrammetry and, most recently, by satellite imagery. Harvard Glacier, a 40 km long tide-water glacier, has been advancing at an average rate of nearly 20 m a-I since 1931, while the adjacent Yale Glacier has retreated at approximately 50 m a-I during the same period though, for short periods, both of these rates have been much higher. The striking contrast between the terminus behavior of Yale and Harvard Glaciers, which parallel each other in the same fiord, and are derived from the same snowfield, supports the hypothesis that their terminus behavior is largely the result of dynamic controls rather than changes in climate.

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Preliminary hydrography and historic terminal changes of Columbia Glacier, Alaska

Cited by 88 publications

References 0 publications

A History of Jökulhlaups from Strandline Lake, Alaska, U.S.A.

A History of Jökulhlaups from Strandline Lake, Alaska, U.S.A.

Mechanical and hydrologic basis for the rapid motion of a large tidewater glacier: 1. Observations

Non-climatic control of glacier-terminus fluctuations in the Wrangell and Chugach Mountains, Alaska, U.S.A.

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