Increasing the supply of land
How is empoldering done?
1) dike is constructed around the area to be reclaimed to keep water from coming in. 2) pumps and drainage canals is used to drain the area 3) reeds are sown go help soil absorb excess water 4) three years later, reeds are burnt, drainage pipes constructed. Ploughs are used to mix fertile ash into soil 5) after 15 years, the polder can be used for growing crops, building houses and constructing roads
What are the uses of reclaimed derelict land?
Agriculture Industry Housing Recreational facilities
How do we maximise urban land use
Can be maximised up your mixed land use and high density building
What is empoldering
Creation of polders which are pieces of land in a Low lying area reclaimed from a body of water by building dikes and through drainage
What method of land clearance?
Deforestation
How do mining activities cause derelict land
Extraction and drilling for mineral ores damage the land Mining produces waste that contains toxic materials which may pollute groundwater and nearby water bodies
What are the limitations of empoldering
Global warming and rising sea levels may cause severe floods which may damage dikes
What are the human causes for derelict land
Improper farming practices Mining activities
Where is empoldering usually carried out?
In Low-lying coastal areas, but also applied to areas that are further inland like lakes
What are the environmental impacts of deforestation?
Increased soil erosion (which affects agriculture) Increased sedimentation in rivers and seas (which affects marine life) Accumulation of carbon dioxide in atmosphere leading to enhanced greenhouse effect and consequently, global warming
How can we maximize agricultural landuse
Irrigation, terracing and soil-less farming
What are methods to increase the supply of lNd
Land clearence Land reclamation Maximising the use of exisiting land
What is derelict lamd
Land that is badly damaged and cannot be used effectively. Can be damaged by human activities and natural disasters such as forest fires and severe floods
What are the three methods of reclaiming land
Landfill Empoldering Reclaiming derelict land
Why does deforestation occur?
Mans need for timber (cooking, logging for construction of homes, paper production)
What is a method of conserving land
Setting aside land for nature reserves
What happens in improper farming practices
Soil loses its fertility when crops are continually grown, harvested and not given enough times to replace its nutrients Excessive ploughing of land may cause soil erosion, loses nutrients, no longer suitable for cultivation
Explain high density building
Technological advances have allowed the construction of taller buildings in areas where land is scarce but in great demand. There are many people working or living per unit area
Example of mixed land use?
The Petronas twin towers of Kuala Lumpur, Malaysia, is an example of mixed land use project where shopping malls, offices and hotels are located in the same building.
What is conserving land
The careful use of land resources to ensure that damage is kept to the minimum
What is land reclamation?
The creation of dry land from an area covered in water, also refers to the process of recovering land that is damaged and abandoned and making it useful again
What is terracing?
The method of creating flat strips of land by cutting a series of steps into hill slopes
What is soil-less farming
The method of growing crops without the use of soil
What is land use planning
The process by which different areas in a piece of land are assigned to different land uses
What is irrigation
The watering of crops through artificial means
To prevent the polders from being waterlogged, ?
They are managed by drainage canals and pumps
What are the two methods of maximising use of existing land
Urban land use Agricultural land use
How to restore derelict land
Using fertilisers and irrigation for land spoilt by farming practices Waste heaps need to be levelled and mining pools filled. Chemicals can be used to treat contaminated soils