What is the difference between basal sliding and plastic flow?
Plastic flow involves the entire ice mass slipping along the ground, whereas basal slip involves movement within the ice. Plastic flow occurs in the deeper parts of the ice mass, whereas basal slip occurs at the base of the glacier only.
What causes plastic flow in a glacier?
Basal sliding and plastic flow. A valley glacier has various components of flow. This process is called basal sliding. In addition to basal sliding, which slowly moves the glacier downslope as a unit, plastic flow causes glacial ice buried underneath more than about 50 meters to move like a slow‐moving, plastic stream.
What is the flow rule?
Flow rule. In metal plasticity, the assumption that the plastic strain increment and deviatoric stress tensor have the same principal directions is encapsulated in a relation called the flow rule.
How is U shaped valley formed?
U-shaped valleys have steep sides and a wide, flat floor. They are usually straight and deep. They are formed in river valleys which, during the ice age, have been filled by a large glacier . These glaciers have deepened, straightened and widened the valley by plucking and abrasion.
What is the difference between a U-shaped valley and a V-shaped valley?
U-shaped valleys are typically carved by a glacier. Such landforms are very common in previously glaciated mountainous areas. V-shaped valleys are even more common because they are usually eroded by running water. V-shaped valley has been typically eroded by running water.
How long does it take for a valley to form?
between 10,000 and 100,000 years
What is a relationship between fjords and U shaped valleys?
Valley glaciers sometimes flow through narrow inlets (fjords) into the ocean. They over-steepen the walls around them, as they do when carving u-shaped valleys. Thus, fjords have tall, steep walls like glacial valleys, but their floors are below sea level and thus are inundated with ocean water.
What is formed by a slow moving river winding back and forth along the valley floor and the floor is wide?
V-shaped valley: Thus, the stream slowly sweeps across the valley floor in a series of S-shaped bends called meanders (pronounced me-AN-ders). Over time, as the stream continues to meander, it erodes away material on the valley floor, ever widening it.