Rivers (continued)

Question 1

What happened to the transport in Bangladesh after the flood?

Answer 1

The airport in Dhaka was flooded
Bridges destroyed
Railways damages

Question 2

How much of Dhaka was underwater after the flood in Bangladesh?

Answer 2

40%

Question 3

How many deaths after the Bangladesh flood?

Answer 3

750 deaths

Question 4

How many people displaced and homeless after the Bangladesh floods?

Answer 4

30 million

Question 5

When were the floods in Bangladesh?

Answer 5

2004 from July to September

Question 6

How many people suffered from disease after Bangladesh?

Answer 6

100,000 people suffered from diarrhoea as the floodwaters left raw sewage in towns

Question 7

What are the causes of floods?

Answer 7

Prolonged rainfall which causes saturated soul so rain can’t infiltrate and so surface runoff is increase
Relief - steep sided valley causes a faster release of water
Snowmelt - lots of water produced in a short amount of time
Heavy rainfall - lots of surface runoff

Question 8

What type of energy is hydraulic action?

Answer 8

Kinetic

Question 9

What type of energy does the upper course have?

Answer 9

Gravitational potential energy

Question 10

Where does deposition occur?

Answer 10

Anywhere along the river

Question 11

Where is large material deposited?

Answer 11

Near the source

Question 12

How does the amount of sediment deposited change downstream?

Answer 12

Increases with distance from the source but is increasingly fine sediment

Question 13

What type of rock is graphite?

Answer 13

Metamorphic

Question 14

What does pervious?

Answer 14

Permeable

Let’s water through due to clints and grykes

Question 15

Formation of an oxbow lake?

Answer 15

• fastest flow of water on outside bend of river
• slower flow on the inside
• this results in erosion outside and deposition on inside
• eventually the neck is Brocken creating a straight channel
• over time deposition occurs and seals the old meander
• leaving an ox bow lake

Question 16

Problems with flood zoning?

Answer 16

Limited building limits industrial development and job creation

Question 17

Disadvantage of warnings as a flood response?

Answer 17

Threat remains and dosent prevent damage stress as people have to claim on insurance and in future years

Question 18

What is it called when a meander shifts downstream?

Answer 18

Meander migration

Question 19

What is the long profile?

Answer 19

Change in altitude and gradient from the rivers source to its mouth

Question 20

What is the cross profile of a river?

Answer 20

The change from one valley side

Across the valley floor which contains the channel to the other valley side

Question 21

Advantages of using embankments as a hard engineering strategy?

Answer 21

Could be also used as a path
Concrete embankments are effective at stopping bank erosion
Earth embankments provide habitat for plants

Question 22

Disadvantages of embankments as a hard engineering strategy?

Answer 22

Ugly

Often not high enough

Question 23

Disadvantages of warning systems?

Answer 23

Does not save property

Might not be sufficient time for residents to respond

Question 24

Effects of Queensland floods?

Answer 24

35 died
100,000 no electricity
78% of the state damaged
2.1 million affected 
25,000 homes flooded
Area larger than France and Germany flooded

Question 25

Responses to the Queensland floods?

Answer 25

Nadal vs Federer raised $750,000
Australian defence force raise
Rest of country taxed
AUSTRALIAN DEFENCE FORCE made a live appeal and raised $10 million
England vs Australia cricket donated match fee