THE BOOK
Some of the ideas discussed in this blog are published in my book called "The Bluestone Enigma" -- available by post and through good bookshops everywhere. Bad bookshops might not have it....
To order, click
HERE

Thursday, 15 November 2012

Meltwater conduits

In the light of the comments about that snow tunnel, here are a couple of pictures of tunnels in glacier ice, for comparison.  The one above is a conduit (actually, it looks like a moulin) on a glacier in New Zealand.  Note the very strong scalloping -- indicating very turbulent meltwater flow but not, I think, a situation in which the "pipe" was completely filled with water.  In contrast, look at the one below.  This photo comes from a glacier in Peru.  It's a magnificent conduit which has clearly carried vast amounts of meltwater under very high pressure, with the tunnel filled with water for a limited period while a glacial lake was being drained catastrophically. There are signs that there might have been a sort of spiral flow.  The walls of this tunnel look VERY different...


No comments: