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Today, we are going to examine the components of disaster risk using the formula: Risk = Hazards × Exposure × Vulnerability. Can anyone tell me what each term means?
Hazards refer to potential threats, right?
And exposure means how many people are at risk from those hazards!
Vulnerability is how susceptible those people are to harm.
Exactly! Let's remember this with the acronym HEV for Hazards, Exposure, and Vulnerability. Each factor must be evaluated to understand the overall risk.
So if one of those factors changes, the risk can change too?
Yes, that's right! Changes in any given factor can alter the level of risk faced by a community.
Let’s analyze a scenario near Roorkee, where a stone might fall from a mountain. How do we assess the risk here?
If there are no people around, it's not a disaster risk!
But if there’s someone at the foothill, that changes everything!
Correct! Having a person there increases 'Exposure', hence increasing risk significantly. Now, how does rainfall affect this risk?
Rain could cause a landslide, making it even more dangerous!
Right! That’s why understanding the interaction between hazards and exposure is crucial for effective risk assessment.
Now, let’s think about landslides. Would the risk assessment differ at nighttime versus daytime?
Yes! At night, people are likely asleep and less aware, making it riskier.
During the day, people are probably outside, but that could make them vulnerable to falling debris too.
Excellent observations! Depending on time and setting—urban vs. rural—the risk factors drastically shift. That’s why local context is key in risk assessments.
Risk is like a game of dice; hazards, exposure, and vulnerability entice.
Imagine a village near a mountain. With rain, a rock may fall, if no one’s there, it’s no harm at all. But if the village sleeps tight at night, that rock could cause quite a fright!
HEV - Hazard, Exposure, Vulnerability - to remember the key components of disaster risk.
When assessing risks, think 'HEV' for Hazards, Exposure, and Vulnerability.
Term
What is a hazard?
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Term
What does exposure refer to?
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Term
How is vulnerability defined?
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A potential threat that can cause harm or adverse effects.
The degree to which people or assets are subjected to hazards.
The susceptibility of a population or community to be harmed by hazards.
The likelihood of a hazard causing harm considering exposure and vulnerability.
This section explores disaster risk assessment through the components of hazard, exposure, and vulnerability, illustrated with examples.
The section discusses key factors contributing to disaster risk, including hazards, exposure levels, and vulnerability. It uses practical scenarios, such as landslide risks in different contexts, to assess how these factors interact and influence risk perception and evaluation.
In this section, we delve into the fundamental components of disaster risk, which are captured by the formula: Risk = Hazards × Exposure × Vulnerability. Prof. Subhajyoti Samaddar illustrates how these components manifest in various real-world situations, such as the risk associated with falling stones in Uttarakhand, the impact of rainfall on landslides, and how the presence of human settlements affects risk assessment. Students are encouraged to consider how factors like time of day and urban versus rural settings can heighten or mitigate risks, guiding discussions on assessing disaster risks effectively.