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The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
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Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
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A wildfire vulnerability index for buildings.

M Papathoma-Köhle1, M Schlögl1, C Garlichs2

  • 1Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences, 1190, Vienna, Austria.

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Wildfire risk is increasing globally, threatening wildland-urban interface (WUI) areas. This study develops a physical vulnerability index for buildings, crucial for risk reduction where data is scarce.

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Area of Science:

  • Environmental Science
  • Risk Management
  • Civil Engineering

Background:

  • Wildfire events pose a significant threat to wildland-urban interface (WUI) areas globally.
  • Changing wildfire risk patterns necessitate better understanding of built environment vulnerability.
  • Limited studies exist on assessing building vulnerability to wildfires.

Purpose of the Study:

  • To develop an innovative physical vulnerability index for buildings exposed to wildfires.
  • To provide decision-makers with a tool for understanding and mitigating wildfire risk.
  • To create a transferable index for regions with limited empirical data.

Main Methods:

  • Utilized an all-relevant feature selection algorithm based on statistical relationships.
  • Employed permutation-based automated feature selection using random forests.
  • Analyzed data from the 2018 Mati wildfire in Greece to select and weight indicators.

Main Results:

  • Identified key building characteristics influencing wildfire vulnerability, including structural type, roof material, ground inclination, and surrounding vegetation.
  • Developed a physical vulnerability index integrating these selected features.
  • Demonstrated the index's applicability for risk assessment and reduction.

Conclusions:

  • The developed physical vulnerability index offers a novel approach to assessing building vulnerability to wildfires.
  • The index is adaptable for use in diverse geographical locations, particularly those lacking empirical data.
  • This tool supports informed decision-making for wildfire risk reduction in the face of climate change.