Glacial erosion
85
(a) Periglacial : before ice arrives
(b) Ice advancing
(c) Glacial maximum
fi iiiiii!!t Perma, rost
~~
Ground water
~'/~1 Frost cracking
~
Glacial ice
Zone of thawing
Water table
Figure 3.24. Mechanism of periglacial breaking of the bottom in glacial valleys (Cailleux, 1952).
case where the height level of the ice rises so that all breachings are used by diffluent ice,
then the term transfluence can be used.
2.6. Glacial landform modelling in regions of little contrasted relief
In previous sections we have analysed the erosive action of ice in areas of strongly
contrasted relief, generating cirques and glacial valleys as the most significant forms. But
it is necessary to also consider that a great part of the terrestrial surface above sea level,
85
(a) Periglacial : before ice arrives
(b) Ice advancing
(c) Glacial maximum
fi iiiiii!!t Perma, rost
~~
Ground water
~'/~1 Frost cracking
~
Glacial ice
Zone of thawing
Water table
Figure 3.24. Mechanism of periglacial breaking of the bottom in glacial valleys (Cailleux, 1952).
case where the height level of the ice rises so that all breachings are used by diffluent ice,
then the term transfluence can be used.
2.6. Glacial landform modelling in regions of little contrasted relief
In previous sections we have analysed the erosive action of ice in areas of strongly
contrasted relief, generating cirques and glacial valleys as the most significant forms. But
it is necessary to also consider that a great part of the terrestrial surface above sea level,