Geography205Updated 18 Sept 20267 pages

Summary of Contemporary Urban Environment (AQA A Level Geography)

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Jessica@.jess.
Urbanisation is rapidly changing how people live and work around the world. From understanding why cities form and grow to managing their environmental challenges, these processes affect millions of people daily and will likely shape your future career and living choices.
Contemporary Urban Environments SUMMARISED – page 1

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Understanding Urbanisation and Urban Change

Urbanisation is simply the process where more people move from countryside areas to towns and cities. This trend is accelerating globally, with the highest levels found in HICs (High Income Countries), whilst LICs and NEEs are experiencing rapid urban growth due to cheaper labour costs.

The movement doesn't stop there though. Suburbanisation occurs when wealthy middle-class families move from city centres to the outskirts, often creating pockets of segregation. Counter-urbanisation sees people leaving urban areas entirely for rural locations, usually due to wealth, retirement, or lifestyle choices.

Deindustrialisation has massively impacted Western cities as manufacturing moved to countries with cheaper labour. This left many urban areas struggling, making urban regeneration a government priority. Key policies include Urban Development Corporations 1980−19981980-1998, Enterprise Zones (1981), and government grants (1982) to attract business investment.

The rise of the service industry has replaced manufacturing as the dominant economic force in many cities. Meanwhile, megacities (over 10 million people) now drive global economies through their political and economic influence.

Quick Fact: By 2025, there will be 34 megacities worldwide, each contributing significantly to national and regional economies.

Contemporary Urban Environments SUMMARISED – page 2

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Urban Climate and Environmental Challenges

Cities create their own weather systems that are quite different from surrounding areas. The Urban Heat Island (UHI) effect makes cities 2-5°C warmer than rural areas because urban materials like concrete and tarmac absorb more heat, whilst there's less vegetation for cooling through evapotranspiration.

This altered climate brings several changes: 5-15% more precipitation, increased cloud cover, and 25% more thunderstorms during summer afternoons. Air quality suffers due to vehicle exhausts, construction, and industrial activities creating particulates that get trapped in the urban atmosphere.

Urban drainage becomes problematic because impermeable surfaces prevent water absorption, leading to increased surface runoff and flood risks. Cities experience higher precipitation rates but can't store the water naturally, forcing it into rivers and drainage systems that often can't cope.

The concept of ecological footprints measures how much cities consume compared to Earth's resources. Urban areas typically have much higher ecological footprints due to transport demands, building materials, and energy consumption patterns.

Remember: Urban areas consume far more resources per person than rural areas, making sustainable development crucial for our planet's future.

Contemporary Urban Environments SUMMARISED – page 3

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Managing Urban Pollution and Sustainability

Cities are fighting back against pollution through innovative technology and policy changes. Electric cars, alternative fuels like LPG and GTL (gas to liquid), and photocatalytic materials that convert smog into harmless substances are becoming increasingly common solutions.

Greening urban areas through vertical gardens and roof gardens helps improve air quality naturally. Some cities have installed air purification towers - Rotterdam's tower cleans 3-5 million m³ of air daily, showing how technology can tackle pollution directly.

Legal measures play a crucial role too. The UK Clean Air Act 1956−19681956-1968 introduced smoke-free zones, whilst modern approaches include congestion charges (like London's), pedestrianisation of city centres, and improved public transport systems to reduce vehicle dependency.

Urban waste management involves multiple approaches: recycling to reduce energy consumption, waste recovery for new products, and controlled incineration with energy recovery. However, problems remain with illegal dumping, ocean submergence, and international waste trading that can damage environments elsewhere.

Top Tip: Many pollution solutions work best when combined - cities using both technological fixes and policy changes see the greatest improvements in air quality.

Contemporary Urban Environments SUMMARISED – page 4

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Managing Urban Social Issues

Cities face significant challenges with economic inequality and social segregation, but there are effective ways to address these problems. Higher minimum wages in major cities like London and New York help reduce inequality, though many developing countries still lack minimum wage protections entirely.

Housing policies are crucial for urban equality. Fair rent legislation prevents exploitation, whilst social housing ensures more people can access affordable homes. London's mayor has committed to providing at least 17,000 affordable rental homes annually to tackle this issue.

Encouraging multiculturalism through festivals like Notting Hill Carnival helps build social cohesion and allows different communities to celebrate their cultures together. This approach helps prevent the isolation and prejudice that can develop when cultural groups live separately.

In developing countries, recognising informal housing rather than demolishing it can be more effective. When squatter settlements gain legal recognition, residents can access clean water, transport, and sanitation services, significantly improving living conditions without displacing vulnerable communities.

Key Point: Successful urban management requires balancing economic development with social equality - cities work best when everyone has access to decent housing, fair wages, and cultural representation.

Contemporary Urban Environments SUMMARISED – page 5

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Urban Microclimates and Form

Cities create distinct microclimates with unique temperature, wind, and precipitation patterns that vary based on their size, shape, and location. These form because of fundamental changes to the land surface - concrete and tarmac replace natural vegetation, reducing shade and evapotranspiration whilst increasing heat absorption.

Urban areas typically experience 2-3 weeks fewer frosts annually, higher pollution levels, and 5-15% more precipitation than surrounding areas. Wind speeds decrease due to tall buildings acting as barriers, whilst humidity patterns shift - lower during the day but higher at night compared to rural areas.

Two distinct layers create urban climate effects. The urban canopy layer operates between buildings below roof level, whilst the urban boundary layer extends above rooftops and creates pollution plumes that drift downwind into surrounding rural areas.

These microclimate domes develop because of heat released from cars, engines, and poorly insulated buildings, combined with dark rooftops and pavements that absorb solar radiation throughout the day and release it slowly at night.

Did You Know: Urban climate effects can extend several kilometres downwind from cities, affecting rural areas through pollution plumes and altered precipitation patterns.

Contemporary Urban Environments SUMMARISED – page 6

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Drainage Management Strategies

Cities use two main approaches to manage water flow and flooding: soft engineering and hard engineering methods. Each has distinct advantages and limitations depending on the urban context and available space.

Soft engineering includes afforestation to increase rainfall interception, floodplain zoning that restricts building in flood-risk areas, and river restoration projects that return channels to their natural courses. These methods are typically cheaper and improve local environments, but they're difficult to implement in already built-up areas and may restrict new development.

Hard engineering involves building dams and reservoirs, straightening rivers to increase flow speed, and constructing levees, embankments, and channelisation with concrete liners. Diversion spillways can bypass main channels during flood events, providing emergency water routes.

Whilst hard engineering prevents flooding and reduces repair costs, it's expensive to build and maintain. These approaches also significantly alter natural habitats and can simply move flooding problems downstream rather than solving them entirely.

Consider This: The best drainage management often combines both approaches - using soft engineering where space allows and hard engineering where urban density demands immediate flood protection.

Contemporary Urban Environments SUMMARISED – page 7

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Urban Land Use Models

Understanding how cities develop helps explain current urban patterns and predict future growth. Burgess's Concentric Zone Model (1925) suggests cities grow in rings around the Central Business District (CBD), with different social classes occupying distinct zones based on their ability to afford transport costs.

Hoyt's Sector Model (1939) argues that cities develop along transport routes rather than in perfect circles. High-class residential areas locate near good transport links to the CBD, whilst industry follows transport corridors for efficient goods movement.

The Multi-Nuclei Model (1945) recognises that modern cities develop around multiple centres rather than just one CBD. This creates specialised districts for different functions - light manufacturing, outlying business districts, and various residential zones of different social classes.

Bid Rent Theory explains why land use varies with distance from the CBD. Commercial activities that benefit most from central locations can afford the highest rents, whilst residential areas locate further out where land costs less. This creates predictable patterns of shops and offices in centres, with housing spreading outwards.

Real World Application: These models help urban planners understand why certain areas develop particular characteristics and predict where future growth might occur based on transport links and land values.

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