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A short class with Sarah and her students. The other ways are under More.
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Let's start by defining what we mean by 'hazard'. A hazard can be a potentially damaging physical event or even a human activity. Can anyone give me examples of hazards?
Natural disasters like earthquakes and floods!
What about human-made hazards, like industrial spills?
Exactly! Hazards can be natural or technological. A simple way to remember types of hazards is by using the acronym NHT - Natural, Human-made, Technological.
NHT? That’s a cool way to remember it!
Great! So, what happens when a hazard occurs within a populated area?
That would increase the risk, right?
Correct! The more people and property are involved, the higher the risk of casualties and damages. Remember: Risk = Hazard + Exposure + Vulnerability. Let's summarize: 'Hazards can be natural or technological, and the impact increases with population exposure.'
Now that we've covered what hazards are, let's dive into the specific categories of natural hazards. Who can tell me about hydro-meteorological hazards?
They’re related to weather, like storms and floods.
What about geological hazards?
Good question! Geological hazards include earthquakes、tsunamis and volcanic activities. A mnemonic you can remember for natural hazards is 'H.G.B' - Hydro-Meteorological, Geological, Biological.
HGB, I like that! Easy to remember!
Are there any human impacts that increase these hazards?
Yes! Deforestation and urbanization can exacerbate natural hazards. Let's summarize: natural hazards can be classified into hydro-meteorological, geological, and biological. Human activity can heighten these risks.
Now let’s talk about how socio-economic factors affect the impacts of disasters. Why do you think poorer communities are more affected by these hazards?
Maybe they have less resources to recover?
They also might live in more hazard-prone areas.
Exactly! Increased vulnerability leads to higher risk. A way to visualize this is the Vulnerability Pyramid, the lower your economic status, the higher your position on the pyramid means higher exposure to risk.
So, they face a double challenge?
Yes! They lack recovery resources and face greater hazards. To summarize, socio-economic factors greatly influence disaster impacts.
What are the key features we need to consider when dealing with hazards?
Frequency and duration?
And the geographical extent?
Perfect! These characteristics are essential for effective disaster risk management. An acronym to remember these features is 'FACE' – Frequency, Area, Conditions, and Extent.
I like that! FACE can help us remember what to consider.
Yes! So, let's recap: Frequency, Area, Conditions, and Extent are the FACE of hazard features that affect risk management.
Potentially damaging events or actions that threaten lives and property.
Defined by the interaction of hazards, exposure, and vulnerability.
Events such as earthquakes, floods, and storms that originate naturally.
Man-made incidents causing harm.
Disasters have differing effects based on a community's economic status.
Example of Hydro-Meteorological Hazard: A severe flood causes displacement of communities and significant property loss.
Example of Geological Hazard: An earthquake leads to building collapses in densely populated areas causing casualties.
Example of Biological Hazard: An outbreak of a contagious disease affects vulnerable populations with limited healthcare access.
When rain comes down, floods abound, we learn from hazards all around.
Think of a community preparing for a storm; they check their resources, gather to inform, understanding hazards – their weathered norm.
Remember NHT for types of hazards: Natural, Human-made, Technological.
Use FACE to recall the features of hazards: Frequency, Area, Conditions, Extent.
Term
What defines a hazard?
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Term
What is the risk formula?
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Term
What types of hazards are there?
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A potentially damaging physical event or human activity that may cause loss of life, injury, and property damage.
The degree to which people or property are likely to be affected by a hazard.
The condition that influences the susceptibility of a community to hazards.
The potential for loss or damage when exposed to a hazard.
Hazards originating from natural processes such as earthquakes, floods, and storms.
Hazards resulting from technological or industrial activities.
Natural hazards primarily influenced by atmospheric and hydro-logical conditions.
Aspects related to economic and social conditions affecting community resilience and recovery.
This section discusses the concepts of hazards, risks, and environmental degradations associated with natural disasters.
The section explores the definitions of hazards and risks, categorizes various natural hazards (hydro-meteorological, geological, biological), and comments on the impact of socio-economic factors on disaster effects in different regions. It emphasizes that environmental degradations may lead to or exacerbate such disasters.
This section provides an in-depth look into the components of risk assessment related to environmental hazards. It begins by defining the core concepts: hazard, exposure, and vulnerability, which together shape our understanding of disaster risk.
Definition of Hazards: Hazards are defined as potentially damaging events or activities, which can lead to loss of life, property damage, and social disruption. It's emphasized that these can originate from natural processes (like earthquakes or floods), human activities, or environmental conditions.
Types of Hazards:
Socio-Economic Context: The section addresses that poorer populations are disproportionately affected by disasters as they often lack resources to respond to and recover from such events effectively.
Key Features of Hazards: It highlights important characteristics of hazards such as frequency, duration, and extent, which are pivotal in disaster risk management efforts.