River Landscapes

Question 1

how do you read a flood hydrography

Answer 1

Peak discharge- highest discharge in the period
Lag time- the delay <> peak rainfall and peak discharge
Rising limb- the increase in river discharge as rainfall flows into the river
Falling limb- the decreas in river discharge as river returns to normal level

Question 2

what are the human causes of increasing the risk of flooding

Answer 2

Deforestation- will give a faster surface runoff
Urbanisation- The concrete pathings will stop the water from being able to be soaked up into the soil(less infiltration).

Question 3

what are the physical causes of increasing the risk of flooding

Answer 3

• Heavy rainfall - increases the discharge quickly
• Relief( how the height of land changes) - if it is a steep-sided valley the water will flow faster and increase discharge

Question 4

What is a drainage basin

Answer 4

The area of land drained by a river and its tributes

Question 5

How does the cross profile of a river change downstream

Answer 5

• larger amount of water

- wider and deeper-tributaries add more water, it erodes channel

Question 6

How does the long profile of a river change downstream

Answer 6

• steep in uplands

- gentle in lowlands