Ice dam

As Ice Blast (also Eisversetzung or Eisstauung ) is called in the aquatic environment (mostly in rivers ) by ice excessively piled-up ice sheets and pieces.


Eisstöße caused by certain weather conditions, mostly on streams or rivers. If after a prolonged cold period in which the waters are thick frozen, rapid heating occurs, break the boards on the water surface. If no obstacles are in flux, so these ice sheets can be washed away easily ( drift ). Bumping this but on a frozen ice sheet, then the sheets of ice jam back and can be both in height as well as under the water pile up toward the base. They occur both in large rivers such as the Danube, but also in smaller, like on the Great Krems or der Thaya in Lower Austria's Waldviertel.

In standing water the ice floes can be driven by continued strong wind to one side. So it often happens that straighten meter high Eisstöße by the prevailing westerly wind on the eastern shore on Lake Neusiedl.

Eisstöße are known only in the northern hemisphere.


The Eisstöße can grow so that the water can not drain and is backed up, which can lead to flooding in the upper shore area in the sequence. If the water pressure is so high that the meltdown breaks by itself, it may occur below a tidal wave. Since the Eisstöße can also form at bridge piers, the water pressure can increase so that all bridges are damaged or torn away.

Eisstöße can often only be resolved by a blast, as you can not reach into the water with conventional construction equipment. Since the meltdown is constantly in motion, represents a major threat Edit a dar.

Historical Eisstöße

On the Danube: