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Wednesday, 23 January 2013

Another glacial lake


One of my favourite photos of a glacial lake margin.  This is from South Georgia -- photo by Chalmers Clapperton.  Note that this lake has a wildly oscillating surface -- it's quite probable that these shorelines are not in a tidy time sequence at all.  Also, note that the strandlines are well marked where the rocky slopes are relatively gentle, but less well marked at the far end of the lake where there are quite active scree slopes.

3 comments:

Constantinos Ragazas said...

Brian,

Scree destroys strandlines! As the same action creates the scree. And scree is what we have at Rhosyfelin. When strandlines are destroyed does the lake cease from having been?

Kostas

BRIAN JOHN said...

Kostas -- strandlines are created by wave action. Scree is created by frost action and the work of gravity. What's your point?

Constantinos Ragazas said...

Frost action affects all sides of a glacial lake. As wave action also does. When the terrain, however, is steep, these actions will create scree. That's my point.