ERTH 2415 Lecture Notes - Lecture 10: Return Period, Avalanche, Transport Corridor
28 Aug 2018
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Document Summary
Natural disaster: an extreme natural event in which a large amount of energy is released in a short time with catastrophic consequences for life and infrastructure in the vicinity. In the middle: disasters occur when hazards meet vulnerability, natural hazards -> vulnerability -> disaster, likelihood that a community will suffer, both in terms of fatalities and physical damage, when exposed to hazards in the environment. Risk levels, probability of fatality and physical damages. Won"t be affected by the strong winds, ice rain . Vulnerability because of the natural causes from the ground. Frequency: metrics to describe hazard levels, number of similar events per unit time, example, on average, 4 former tropical cyclones affect atlantic. Canada every year: frequency = 4 occurrences per year. Inverse is return period: the number of occurrences in a given length of time, example, the earth experiences on great earthquake per year. Return period = year or 6 months: on average, four former tropical cyclones affect.
