METHOD OF ICE JAM ELIMINATION Russian patent published in 2008 - IPC E02B15/02 

FIELD: hydraulic engineering.

SUBSTANCE: invention is intended for ice jam liquidation, appearing during periods of ice drift before the stream crossing. Method is in jam is destructed by means of creation under the ice in the water of high hydraulic pressure before each of bridge support at the expense of high-voltage pulsed spark discharges. Discharges are implemented by means of electrohydraulic facilities, preliminarily installed on supports knowingly lower of low ice surface. Discharges are implemented alternately from support to support, starting from facilities located on and supports, i.e. at river banks, to the middle of stream canal with time lag, equal to passage time of the first vertex flexural-gravitational waves, roused in hummocked ice by area of high pressure, from one support till the first nearest.

EFFECT: arising interference of flexural-gravitational waves exceed effectiveness of ice destruction, and river stream provides passage of hummocked ice between bridge supports.