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GLACIAL MELTWATER

Photo: Franz Josef Glacier, NZ A. Introduction

Photo credit: Z. Strack. Used with permission. Franz Josef Glacier, New Zealand.

Learning outcomes - You should be able to:

Importance

Readings


B. Supraglacial Meltwater

Occurrence: warm-based, cold-based & polythermal glaciers

Lakes & streams

Most well-developed in ablation zone

photo: supraglacial lake
Photo credit: Scott McGee (2006) The Crevasse Zone http://crevassezone.org/Photos/photos_frameset.htm

photo: supraglacial river
Photo credit: Scott McGee (2006) The Crevasse Zone http://crevassezone.org/Photos/photos_frameset.htm


C. Englacial Meltwater

Occurrence: warm-based & polythermal glaciers

Tunnels & small passageways (mm)


photo: subglacial meltwater tunnelPhoto credit: Peter Knight http://www.physicalgeography.org.uk/photos/PhotosGlaciers.html Meltwater portal, Solheimajokul

D. Subglacial Meltwater Link icon:

Occurrence: warm-based & polythermal glaciers

Basal water pressure

Photo: R-channel Photo credit: R. Schukar. Used with permission.

Discrete subglacial drainage systems

Distributed subglacial drainage systems

Soft-bedded glaciers


E. Meltwater Discharge


Photo: Meltwater streams Photo credit: K.A. Lemke. Used with permission.

F. Summary

Occurrence of supraglacial & englacial meltwater

Basal water pressure (BWP)

Discrete and distributed subglacial meltwater systems

Diurnal and seasonal fluctuations in meltwater discharge


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©Karen A. Lemke: klemke@uwsp.edu
Last revised February 15, 2016