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A Level Geography > Urbanisation > Flashcards

Urbanisation Flashcards

(68 cards)

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1
Q

how many people live in urban areas now

A

50%

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2
Q

how many people lived in urban areas in 1950

A

30%

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3
Q

in developing countries where do most people live

A

in rural areas

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4
Q

4 processes that involve the movement of people into and out of urban areas

A

urbanisation, suburbanisation, counter-urbanisation, urban resurgance

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5
Q

whats urbanisation

A

growth in the proportion of people living in urban areas and occurs because of rural-urban migration and natural increase . many migrants are young adults looking for jobs,schools, healthcare

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6
Q

in developing countries what can urbanisation result in

A

results in shanty towns- unplanned and often illegal settlements made out of any material available

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7
Q

whats suburbanisation

A

this is the migration of people from city centres to the outskirts of cities . as urbanisation increases city centres become overcrowded and improvements in transport links means richer people move to the suburbs , this can lead to ethnic and economic segregation

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8
Q

whats counter-urbanisation

A

movement of people out of the city into surrounding villages and rural areas . people leave the cities because of high property prices or just preference . this can lead to housing estates being built and house prices may increase meaing locals may not be able to afford prices . can change the age structure of the area

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9
Q

urban resurgence

A

movement of people back to the city centre. this may be because of lack of jobs in rural areas, new shops and services may open in the citys as people move back creating jobs and boosting economy

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10
Q

whats a megacity and an example

A

a city with a population of over 10 mill eg instabull, tokyo

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11
Q

how many megacities were there in 1950

A

2, tokyo and new york

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12
Q

how many megacities in 1950

A

2 tokyo and new york

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13
Q

how many megacities in 2014

A

28

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14
Q

whats a world city

A

a city that has political and financial influence over the whole world eg london

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15
Q

why does it rain more often in urban areas

A
  • the UHI effect means more warm air rises and warm air can hold more water . and so as this warm air cools it condenses into vapour and rains this is convectional rainfall
  • urban areas produce dust and pollution , these act as condensation nuclei this encourages cloud formation
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16
Q

sources of particulates

A

vehicle exhausts
burning
construction, mining, quarrying
plants and moulds

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17
Q

whats photochemical smog

A

when pollutants such as NO, SO4, hydrocarbons come into contact with sunlight the UV light causes them to breakdown into harmful chemicals

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18
Q

what is photochemical smog linked to

A

health problems, breathing difficulties , respiratory disorders and headaches

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19
Q

how does congestion charges reduce air pollution

A

people are charged if they use their vehicles in certain places at certain times . this reduces pollution by reducing road traffic , in central london emissions reduced by 15% in the first year , however some people travel around the edge of the zones to avoid charges

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20
Q

how does pedestrianisation reduce air pollution

A

vehicles are restricted from entering certain places at certain times. reducing road traffic. can lead to shops receiving fewer customers because people can only get to them on foot

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21
Q

how does public transport improvements reduce air pollution

A

bus serves can be made cheaper faster and more efficient
park and ride schemes to make it easier to access public transport
trams and light railways services which run on lines so they dont get caught in road congestion

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22
Q

how do other schemes for reducing traffic help reduce air pollution

A

in mexico city drivers are banned from using their car one weekday per week based on the last digit of the number plate however rich people just buy 2 cars.

birmingham bristol and london have council run car sharing schemes to encourage people to share cars however this can be incovenient and some worry about sharing with strangers

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23
Q

how does legislation reduce air pollution (uk air acts)

A

uk clean air acts of 1956 and 1968 introduced smoke control areas where only smokeless fuels could be burned and reduced industrial pollution by introducing tall chimneys
road vehicle regulations means cars have to pass emmisions test in their MOT

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24
Q

how do alternate fuel sources reduce air pollution

A

petrol and diesel are replaced with cleaner fuels that pollute less like
- biofuels from plants , can replace petrol and deisel but can reduce biodiversity
- liquefied petroleum gas, produced from fossil fuels has lower emmisions but service stations and cars would have to be adapted for use
-electric vehicles - run off batteries , need recharging points and producing and disposing of batteries can cause environmental issues

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25
why is photochemical smog pollution more common in hot climate
theres more sunlight so more UV to break down pollutants into harmfull chemicals
26
why is infiltration low in urban areas
as urban areas are covered in impermeable surfaces
27
whats catchment management
a way of managing rivers and improving drainage systems by looking at the whole river catchment and the interactions between water and land. aims to minimise issues such as flooding, draught, water pollution and erosion and to improve river ecosystems
28
hard engineering and managing river catchments
involves man made structures like dams, floodwalls and reservoirs which prevent against flooding and ensure a constant water supply. however this can be very expensive and disrupt natural systems
29
soft engineering and managing river catchments
process that try to work with nature involving land use management eg planting trees and preventing building on flood plains. also involves river restoration . generally cheaper and can improve local environment however planning restrictions can limit construction and land use management is hard in places already urbanised
30
how many people were forced to move for the construction of the 3 gorges dam in China
1.2 million forced to move 13 cities and 140 towns flooded
31
what does SUDS stand for
sustainable urban drainage systems
32
whats a swale
vegetated trenches increase interception of rainfall and retention basins store water. they help to increase infiltration and water storage this decreases runoff and channel flow which lowers flood risks
33
how do vegetated roofs reduce floods
they intercept rainfall and increase evapotranspiration which reduces flood risks
34
how do containers reduce floods
containers on roofs of buildings catch and store rainwater for reuse this helps to reduce drought risk
35
the 3 primary sources of waste in urban areas
industrial waste- stuff from manufacturing process and industrial activity can be toxic commercial waste- stuff thats produced by businesses eg shops and restaurants personal waste - any waste produced by private homes eg plastic bottles, food packaging, newspapers
36
Social and economic issues associated with urbanisation
Economic inequality Social segregation Ethnic segregation Cultural diversity ( puts pressures on services )
37
Ways of tackling poverty and inequality
Interculturalism Enforcing living wage Affordable housing Public transport made affordable Legislation on anti-racism, employment rights, prejudice
38
Social segregation because of housing
Developers and planners tend to build housing on land with a particular market in mind In some areas where affordable housing is a requirement in new developments Poorer groups have less choice
39
Social segregation due to changing environments
Housing neighbourhoods change overtime, housing built for large Victorian families are now too big for now family’s Former poor areas are being gentrified Right to buy legislation 1980s
40
Right to buy legislation 1980s
Allows council tenants to buy their council home at a discount. And they have the right to them sell it later at full price
41
Social segregation due to ethnic dimension
When migrants first arrive they may suffer to find high paying work So they can only afford cheap housing So newest arriving migrants after concentrate in poor areas
42
Multiple deprivation index
Qualitative studg measuring deprivation Based on 7 factors which are combined Good as it takes in so many factors like: Income,employment, health,education, crimes,living environment, access to housing
43
Urban social exclusion
Term refers to problems faced by residents in areas of MD People excluded from full participation in society by their social/physical circumstances Leads to lack of social cohesion and in extreme cases civil unrest
44
What areas of a city are most deprived
Inner city’s
45
Cycle of poverty
Inequality tend to exist in terms of access to job opportunities, education, housing. The knock on affects is poorer health, high unemployment and lack of social mobility Hard to escape cycle of poverty
46
Diaspora
The term used to describe a large group of people with similar heritage or homeland who have settled elsewhere in the world. Eg the UAE state of Dubai where the majority of the city is made up of migrants. 2/3rd is Asian decent
47
Why is there greater cultural diversity in cities
Immigrants more likely to live in city as: -More employment opportunities -first point of entry in a city -house earlier immigration groups of same ethnicity -established cultural diversity - urban populations more tolerant of 8mmigrants
48
Advantages of cultural diversity
Different and new foods, music, language and religion
49
Issues with cultural diversity
Language differences will require local authority’s to provide English lessons Hospitals may need to cater for specific illnesses Schools may need to alter curriculum and holiday to cater for different ethnic groups
50
Reasons for UHI
Building materials such as concrete and bitchamin are non reflective and absorb heat Heat is absorbed during day and released at night Air pollution from industries and vehicles increase cloud cover- reflecting radiation back to reface Heat from buildings , vehicles and people
51
Relative humid
The ration of the amount of water in the air at a given temperature to the maximum amount it could hold at that temperature expressed as a percentage
52
Way is rainfall higher in urban areas
Higher temps encourages lower pressure. Warmer air can hold more moisture and relative humidity levels are 6% lower Urban areas have more frequent and thicker cloud cover than rural areas due to convection currents Convection rainfall tends to be heavier and more frequent
53
Aims for suds
-Store runoff and release it slowly -harvest and use the rain close to where it falls -allows water to soak into ground -slowly transport water - filter out pollutants -build up ecosystems and wildlife Aesthetic
54
Wetlands
-Provide both storm water attenuation and treatment -shallow ponds and marshy areas covered in aquatic vegetation -provide ecological benefits - slow flows for extended period to allow sediments to settle and to remove contaminates
55
What are the 3 Rs
Reduce Re-use Recycle
56
Reduce
-Best approach to prevent waste, businesses are encouraged to reduce the amount of packaging used - consumers can help by refusing plastic bags - charges for plastic bags
57
Re-use ( waste management)
Attempts to reuse jam jars, milk containers, soft drinks/ water bottles Example, bag for life
58
Recycle ( waste management )
Paper, glass, metal cans, plastic and clothes can all be recycled Problems- start up costs are high, households are often unwilling to sort recyclables
59
Benefits of landfills
Convenient and cheap Gas produced can be collected to produce electricity
60
Problems of landfill
Threat to groundwater supplies and river quality ( contamination of water) Methane Nappies take 500 years to break down Running out of space
61
Energy recovery (incineration)
Waste material converted into energy Modern incinerators generate electricity or power neighbourhoods 7 licences municipal incinerators in uk Advantages= can reduce vol of waste by up to 90%, can produce energy as output Disadvantage= severe air pollution, quite expensive
62
Energy from east (efw) Leeds
306 000 tonnes of waste from homes in Leeds each year. This incinerator currently recycle around 40% of this waste Waste used to heat 20 000 homes Saves the council 7mill each year compared with landfill
63
How much heating energy does Sweden gain from combusting waste
8% of total heating energy
64
Why is incineration preferred
Energy Efficiency Space
65
Landfill
Affordable Convenient However emissions are released Public health threat from emissions
66
Why do urban areas have more fog
-Wind speeds lower so fogs not as easily dispersed -Pressure of pollution provides hygroscopic Nuclei for water droplets to form Presence of pollution prevents suns rays penetrating to the ground and warming up the fog, so fog not dispersed
67
Why is air quality poorer in urban areas
Particulate pollution Temperature inversions where cool sinking air can become trapped below a layer of warm air Photochemical smog, which is low level o-zone pollution associated with cars and pollution
68
Strategies to minimise pollution and the UHI effect
Clean air acts Green roofs Urban greening Zoning of industry’s Lighter coloured buildings Vehicle control and public transport Open up spaces

A Level Geography (9 decks)

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