Geosphere- Draninage Networks

Question 1

What factor determines drainage direction

Answer 1

Topography

Question 2

What 3 factors is velocity dependent on

Answer 2

Rivers slope
Depth
Roughness

Question 3

Discharge definition

Answer 3

Amount of water that passes by a time unit through a section of the river

Question 4

Discharge equation

Answer 4

Width x depth x velocity

Question 5

What is the sediment delivery ratio

Answer 5

The fraction of sediment eroded from slopes that reaches the drainage basin outlet

Question 6

Does the sediment delivery ratio increase or decrease downstream and why

Answer 6

Decreases downstream because sediment storage potential increases as valleys become wider and less steep

Question 7

What are the controls on river long profile (3)

Answer 7

Discharge
Sediment load
Size of sediment

Question 8

What is the river long profile

Answer 8

The change in height of the river bed moving downstream

Question 9

Leopold and Wolman graph: what do channels above the line have

Answer 9

Steeper, generally braided in form

Question 10

What controls the accommodation space available

Answer 10

Base level
Tectonics
River long profile shape