5A1 Investigating Australias Physical Environments Syllabus Agenda the nature of the natural hazard in Australia the geographical processes involved the impacts of the natural hazard ID: 812923 DownloadTags :
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Presentation on theme: "Natural Hazards Year 9 Geography"— Presentation transcript
Year 9 Geography
Investigating Australia’s Physical Environments
nature of the natural hazard in Australia
geographical processes involved
impacts of the natural hazard:
responsibility and responses of individuals, groups and various levels of government to the impact of the natural hazardSlide3
Natural hazards in Australia
Describe the range of natural hazards in Australia and their consequences including:
bushfires, droughts, earthquakes, floods, storms and tropical cyclones.
For at least one natural hazard:
The nature of the natural hazard in Australia.
The geographical processes involved.
The impacts of the natural hazard: economic,
environmental and social.
The responsibility and responses of individuals, groups and
various levels of government to the impact of the natural
A natural hazard is when the forces of nature combine to become destructive including tropical cyclones and storms, floods, bushfires, droughts, earthquakes, landslides and tsunamis.
on natural hazards.Include a definition and anillustration for each natural hazard listed above.Slide5
Types of natural hazards
Natural hazards can be separated into two main categories:
1. Those related to weather and climatic factors – drought, flood, heat waves, bushfires, strong winds, storms, cyclones and tornadoes.
2. Those related to movements in the earths crust – landslides, earth tremors, earthquakes and tsunamis.Slide6
Types of impacts
Three main categories
Social impacts – loss of life, stresses placed on families and people, destruction of community structures and facilities.
Economic impacts – loss of income for people or damage to an industry, loss and destruction of property, insurance losses.
Environmental impacts – destruction
of natural and human environment,
death of and injury to wildlife,
changes to environments.Slide7
Building damage in Australia
Using figure 2.4
Name the three most costly natural hazards in terms of building damage in AustraliaSlide8
A tropical cyclone is an intense tropical storm that develops over warm oceans between 5° and 20° north or south of the Equator.Slide10
Tropical Cyclones (TC) in
form over the northern parts of Australia in the months from November to April.
They affect areas North of Perth along the coasts of Western Australia and the Northern Territory, the Queensland coastline and the far north coast of New South Wales.Slide11
Download the Cyclone worksheet
Complete the worksheet
Key geographical processes in cyclone development
They form in the band between 5° and 22° N and S of the Equator over oceans with a water temperature greater than 26.5°C.
Warm moist air over these oceans rises, causing low pressure systems to develop.
The rising air forms clouds, which release heat, causing the air to rise further, leading to a tropical storm.Slide13
How tropical cyclones develop
Tropical cyclones develop in the
regions of the world.
Heat from the sun causes
warm, moist air to rise
into the atmosphere.
As the air rises, a low-pressure system forms and condensation occurs, which releases further latent heat causing the
into the atmosphere.
in the upper atmosphere is
, then the rising column of
warm air will spiral outwards
in the upper atmosphere and
rush from the surface to replace it
, forming a tropical cyclone.Slide14
Cyclones (Hazards Disasters & Survival)
Click view movie Social Science / Geography / CyclonesSlide15
Tropical cyclone conditions
Winds can reach and exceed speeds of 120 kilometres per hour (km/h), with gusts exceeding 170 km/h. Winds at these speeds can do great damage to property, including causing boats to slip from their moorings, downing trees and even ripping roofs and walls from buildings.
Power lines are often damaged in tropical cyclones, causing power outages.
High levels of rainfall cause flooding in some areas.Slide16
Storm Surges – another risk from tropical cyclones
Storm surges are a rise in sea level caused by high winds pushing water towards shore and lower atmospheric pressure.
Storm surges are affected by:
wind speeds within the cyclone,
the speed at which the cyclone is travelling towards the coast,
The angle at which the cyclone crosses the coast,
the shape of the sea floor, and
local topography. When high tide comes to an area at the same time as a storm surge, a phenomenon known as a storm tide can cause the sea level to be even higher. This can threaten areas that would usually be safe from a high tide, causing flooding and sea damage.Slide17
Five categories of tropical cyclones
Little damage to houses and other buildings. Some damage to crops and other vegetation. Wind speeds less than 125 km/h.
Minor damage to houses and other buildings. Damage to signs, trees and caravans. Heavy damage to crops and other vegetation. Small boats break moorings. Risk of power failure. Wind speeds between 125 km/h and 169 km/h.
Some damage to roofs and building structures. Some caravans destroyed. High risk of power failure. Wind speeds between 170 km/h and 224 km/h.
Heavy damage to roofs and building structures. Caravans destroyed and blown away. Risk of damage from flying debris. Widespread power failures. Wind speeds between 225km/h and 279 km/h.
Very heavy and widespread destruction. Wind speeds over 280 km/
Little damage – houses and buildings
Some damage – crops and vegetation
Copy and complete table to
the five categories of tropical cyclonesSlide18
In Australia, the Bureau of Meteorology identifies potentially dangerous cyclones and tracks them using weather stations on small islands and information from satellite pictures.
If a cyclone is deemed dangerous, a
is issued in areas that might be affected from three
Tropical Cyclone Warning
Centres (TCWC) located in Brisbane, Darwin and Perth. Cyclone warnings tell people how to prepare for the coming storm. This can range from securing loose objects that might cause damage to evacuating the area until the storm has passed.People living in areas prone to tropical cyclones have to take precautions at all times. Citizens are encouraged to pack emergency kits and evacuation kits to keep in their houses. Houses in at-risk areas are built to strict building codes.
- The Emergency Management Australia website
Report on the most recent tropical cyclone that has been responded to.Slide19
Steps to take when planning for the cyclone season
Check the building regulations.
In some areas, if you are building a house, there are strict regulations that need to be followed. These can be found at your local council.
Ensure your home is in good condition
, especially the roof: no loose tiles, the structure is secure and safe
Clear property of loose items
and /or secure them. This reduces flying debris, which can cause fatal accidents
Locate nearby safety. Find where your nearest safe higher ground is in case of flood warnings Create your emergency survival kit and stock tinned food, water containers, medicines, important documents, torches, candles and matches, portable radio Discuss with your family your emergency plan. Decide on the safest places in the house should a cyclone threaten, as well as ensuring that the emergency kit is easily accessible to all family members, a list of emergency contacts are clearly visible and a copy is in the emergency kit.Slide20
Emergency survival kit
Refer to the information and template in
emergency pantry list.
Plan the food for your family in an emergency.Slide21
Steps to take during and after a cyclone
During the cyclone, ensure you:
stay inside and be sheltered in the strongest part of the house (e.g. bathroom)
protect yourself with mattresses and blankets
hold firmly to a strong fixture such as pipes or stay under a solid table
remain indoors until the cyclone has completely passed. Remember in the eye of the cyclone there is a brief moment period of calm weather. After that, the cyclone will continue.
The calm after the storm
Remain indoors until you are advised that it is safe. When you do go outside, be aware of debris, buildings and trees may be unstable and power lines may have fallen.If you are driving, use recommended routes to avoid accidents, flooding of rivers and roads, and debris falling in the path of the cyclone.Activity:
Use word art to develop a pamphlet to educate individuals in cyclone prone areas on the steps to take to prepare for cyclones, during a cyclone and after the cyclone.Slide22
loss of lives and death
financial trauma because of loss of homes and people become worried that another cyclone will come and do further damage.
loss of food supplies can lead to malnutrition.
water contamination could occur and peoples health may be affected.
people come together and work as a team and community spirit can be strengthened.Slide23
Water supplies may be compromised if supplies are contaminated and pipelines cut.
Sewerage lines may be cut, resulting in a lack of sanitation, and poisons therefore leaching out into the environment.
If the cyclone brings flooding, there are the usual problems resulting from too much water, e.g. loss of animal and plant habitats.
Trees may be uprooted, and animal habitats destroyed. This causes the food chain to be broken, and it can be many months before food chain order is reestablished among the various species.
Beaches are often strewn with dead marine or coastal-dwelling creatures.
Litter ends up in the ocean, destroying animals' habitats.
Many coral reefs, fish and animals can be damaged and can take years to recover.Slide24
Less income from exports and general economic turndown.
Flooding and high winds can destroy all crops.
Cost of creating a new infrastructure.
Not as many tourists ( short term effect)
Businesses closed down and people unemployed.
Develop a collage of the social, environmental and economic impacts of a cyclone in Australia.Slide25
When did cyclone Tracy hit Darwin?
What role did the local police and community leaders play in responding to the hazard?
What is the National Disaster Organisation and why did it become involved in the response to Cyclone Tracy?
Why do you think evacuation of Darwin was an essential response to Cyclone Tracy?
Calculate the percentage of Darwin’s population that was evacuated in the week following Cyclone Tracy.
How has cyclone Tracy better enabled communities to prepare for this type of hazard?Slide26
Comparison of recent Tropical Cyclones
Go to site
Use this page to complete the following table:
Australian Government response to disasters
The primary role for protecting the community and property rests with state and territory governments.
The Australian Government supports the states and territories in recovery response through the provision of a range of programs and tailored assistance measures.
In November 2005, the Australian Government Disaster Recovery Committee (AGDRC) was established to provide advice on, and coordinate implementation of, tailored disaster recovery assistance measures to Australian individuals, families and communities in response to disasters.
It ensures that coordinated whole-of-Australian Government recovery assistance can be provided quickly to Australians.
It develops and coordinates whole-of-Australian Government social and community recovery packages.Slide29
20 March 2006 – Far North Queensland - Tropical cyclone Larry – Australian Government Response
A natural disaster zone was declared by the Queensland Government.
of $1,000 per eligible adult and $400 per eligible child for people whose principal place of residence was destroyed by the cyclone or was rendered uninhabitable
to taxpayers who suffered damage to their homes and businesses.
a one-off income support program
for affected farmers and small business a tax-free grant of $25,000 for businesses demonstrating significant losses a wage subsidy for employers (businesses, farmers and non-profit organisations
) to help employers retain their pre-cyclone
levels and get back into production and business as quickly as possible
concessional loans of up to $500,000
to eligible farmers and business to re-establish their enterprises
assistance with excise on diesel or petrol fuel
used by businesses, farmers and households to generate their own electricity until normal services were restored
assistance for costs associated with hiring a generator
where electricity was needed to operate equipment required to relieve livestock distress.
Activity 2 - Role of groups – Describe how the Red Cross responded to Cyclone Larry. Go to
Activity 1 :
Use a table to
how the Queensland Government responded to cyclone Larry.Slide30
. Find PDF - St
Abergowrie College Cyclone Yasi: A Diary.Use this PDF to help you image you were one of the children at St Terersa’s. Write a diary entry describing what happened during your day.Develop a poster for a local school in Queensland to explain how individuals could help Cyclone Yasi victims.