The problem of ice destruction comes most frequently to our attention in
engineering glaciology and ice engineering because it is essential in
the solution of many problems in the polar regions of the Earth. Ice
destruction (like the destruction of any other material, in principle)
is a complex problem at the junction of solid-state physics, continuum
mechanics, and materials science. Ice, particularly sea ice, is
characterized by known anomalies that can be explained by the
simultaneous occurrence of solid, liquid and gaseous phases. Even minor
temperature fluctuations cause changes in the relationship of these
phases and, as a consequence, change the physico-mechanical properties
of ice. New hydraulic engineering tasks, associated with the destruction
of such a complex material, demand continuous improvement of methods and
techniques. The present authors have brought these together in a form
which is convenient for a wide range of users. This book covers only
local ice destruction, by means other than icebreakers, requiring
comparatively low consumption of power in proportion to the volume and
mass of destroyed ice. Problems of natural ice destruction under the
influence of solar radiation, tidal, wind and wave factors are not dis-
cussed. Mechanical and thermal methods were the first of many to be used
for ice destruction. Their application has involved a greater num- ber
of techniques, so the first two chapters are the longest.