A Study on the Estimation of Compound Natural Disaster considering Inter event time of Natural Disaster
By Duk-jin Jang, Hong-sang Lee
Although many studies on natural disasters are being conducted, there is a problem of underestimating the actual risk because each natural disaster is considered as independent subject. For solving the problem, concept of compound natural disaster has been presented and utilized. However, in defining a compound natural disaster, there is no methodology for quantitatively calculating the criteria for determining whether each disaster is independent.
Therefore, this study proposed a methodology to define Natural disaster InterEvent Time Definition (NIETD) using InterEvent Time Definition (IETD) used to separate long-term rainfall into individual rainfall events. That is to say, NIETD can be defined as the time window that two or more natural disasters are occurring and we tried to define NIETD in Korea. As a result of calculating NIETD using disaster related data provided by database of Ministry of the Interior and\ Safety, NIETD was determined as 8 days and compound natural disasters in South Korea were identified. compound natural disasters of 14 types were occurred in the period of 2010 to 2019, and among them, the highest number of compound natural disaster came from consecutively occurred heavy rainfall events. The compound natural disaster by continuous heavy rainfall events and typhoon gave us the biggest damage and victims. Therefore, we have known that the compound natural disasters had been frequently occurred in South Korea.
Key Words : Natural disaster, Compound natural disaster, InterEvent Time Definition, Natural disaster InterEvent Time Definition
A Study on the Estimation of Compound Natural Disaster considering Inter event time of Natural Disaster
By Duk-jin Jang, Hong-sang Lee
Although many studies on natural disasters are being conducted, there is a problem of underestimating the actual risk because each natural disaster is considered as independent subject. For solving the problem, concept of compound natural disaster has been presented and utilized. However, in defining a compound natural disaster, there is no methodology for quantitatively calculating the criteria for determining whether each disaster is independent.
Therefore, this study proposed a methodology to define Natural disaster InterEvent Time Definition (NIETD) using InterEvent Time Definition (IETD) used to separate long-term rainfall into individual rainfall events. That is to say, NIETD can be defined as the time window that two or more natural disasters are occurring and we tried to define NIETD in Korea. As a result of calculating NIETD using disaster related data provided by database of Ministry of the Interior and\ Safety, NIETD was determined as 8 days and compound natural disasters in South Korea were identified. compound natural disasters of 14 types were occurred in the period of 2010 to 2019, and among them, the highest number of compound natural disaster came from consecutively occurred heavy rainfall events. The compound natural disaster by continuous heavy rainfall events and typhoon gave us the biggest damage and victims. Therefore, we have known that the compound natural disasters had been frequently occurred in South Korea.
Key Words : Natural disaster, Compound natural disaster, InterEvent Time Definition, Natural disaster InterEvent Time Definition