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Glacier Morphology - what's on the picture?

 
 
Reply Sun 26 Apr, 2015 09:07 am
I'm a Danish geology student having trouble with glacier morphology.

I have been provided with these screenshots of a height profile centering around a small Danish lake.
Terrain map:
http://s10.postimg.org/3kecm2qc9/113.jpg
The lake lengthwise:
http://s10.postimg.org/9zddiqx21/114.jpg
The lake crosswise:
http://s10.postimg.org/n4svouqxl/115.jpg

I think the lake is part of a tunnel valley but I can't say more than that about it.
Can anyone explain it to me?
 
farmerman
 
  1  
Reply Sun 26 Apr, 2015 10:38 am
@Wormple12,
s a hint, th first one is a LIDAR map and its program was probably SLOPESHADE. Its not really topo , its a reconstruction of slopes (darker the shading, steeper the slope)

As far as its nomenclature, not sure its a tuneldahl. I do think youre right because theres a tunellach and the S side of the LIDR map shows a really sharp cut bank as if it were eroded rapidly.
and its floor is sharply cut, (not glacially cut). There are some features on the LIDAR that show glacial features.
I think youre on th right track but Id look at the history pf the section as you can see from the LIDAR and the cuts.

.
Wormple12
 
  1  
Reply Sun 26 Apr, 2015 11:06 am
@farmerman,
Okay, it's a LIDAR map, got that part.

Not sure what a "tunellach" is, and I can only presume "tuneldahl" means "tunnel valley".

I'm glad I'm on the right track though.
farmerman
 
  3  
Reply Sun 26 Apr, 2015 11:12 am
@Wormple12,
tunnel lake(lach) and tunneldahl(valley) are the terms used in the AGI glosary (i think). We in the US actually defer to the original names.

A tunnel lake and valley are related by drainge. Can you say anything about the shape of the valley that would tip you off as to its origins??

Look at your X secs.

The LIDAR really tells us a lot, you can see the makeup of the material through which your section lines are drawn. Is this totally a map exercise with no field time? If so, youve got a lot of information and Im not gonna tell you any more. ITS YOUR HOMEWORK
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