Mass Movement, Rivers, and Erosion/Deposition Systems

Front

What is mass movement?

Back

Mass movement refers to the downward movement of soil and rock due to gravity, which can occur rapidly (like landslides) or slowly (like soil creep).

Front

What factors influence river erosion?

Back

Factors include water velocity, sediment load, river gradient, and the type of material the river flows over.

Front

Define sediment sorting in rivers.

Back

Sediment sorting is the process by which sediments are separated by size and weight as they are transported by water, resulting in sorted deposits.

Front

What is the relationship between river velocity and sediment transport?

Back

Higher river velocity allows a river to carry larger and heavier sediments, while lower velocity can only transport smaller sediments.

Front

What happens to sediment on the inside of a river meander?

Back

Sediment tends to deposit on the inside of a meander where the water flows slower, leading to a gentler slope.

Front

What is the largest sediment size a river flowing at 2 cm/sec can carry?

Back

The largest sediment size is 0.03 cm.

Front

How does a storm affect river erosion?

Back

A storm can increase the discharge of a river, leading to higher rates of erosion.

Front

What is the effect of river gradient on erosion?

Back

A steeper river gradient typically increases the velocity of the water, enhancing its ability to erode the riverbed and banks.

Front

What is the minimum flow speed required to carry sediments of 0.4 cm in diameter?

Back

The minimum flow speed required is 20 cm/sec.

Front

What is deposition in the context of rivers?

Back

Deposition is the process where sediments are dropped or settled out of the water as the flow velocity decreases.