Jokulhlaups are Icelandic glacier burst floods. One is currently threatening the main Icelandic A road that circles the country.
The flow of the river (pictured above) increased from its usual 120 cumecs to over 2000 cumecs overnight!
A subglacial eruption melts the base of the ice cap, the melting causes the surface of the ice cap to subside, meltwater water eventually emerges as a huge flood.
For the video click here
Follow the links to the 'sinking icecap' and 'Skafta flood this one could be very big' from the link below.
HAZARDOUS ENVIRONMENTS AND HOW TO COPE
http://icelandmonitor.mbl.is/news/nature_and_travel/2015/10/01/glacier_flood_may_reach_national_ring_road/
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