Abstract
Inundation damage occurs in urban regions due to short flood reach time and increased surface runoff caused by urbanized impervious areas. Furthermore, heavy rainfall frequency has increased because of climate change, thus exceeding the design frequency and resulting in sewer pipes’ lack of flood control capacity, with damage expanding from low-lying areas. Despite many urban disaster-mitigation policies, complex causes and uncertainties make reducing urban inundation damage difficult. This study established a rainfall-related disaster-prevention standard by time duration considering rainfall characteristics targeting urban disaster-induced inundation damage. Based on the South Korean urbanization rate and population, seven target regions were selected. Rainfall by time duration was analyzed with respect to disaster length (number of days) from 2010–2017. The average rainfall for durations from 1–24 h were analyzed according to disaster length (1–13 days). Using the results, an equation was proposed for rainfall estimation by length of disaster resulting in urban inundation damage, through multiple regression analysis. An equation was developed for rainfall-related disaster-prevention in urban areas considering the length of disaster and rainfall duration. This was accomplished by selecting a duration whereby the average rainfall of duration corresponded to 50% of total rainfall during the disaster period.
Highlights
IntroductionUrban areas developed for convenience and safety as a result of social and economic changes [1,2]
Urban areas developed for convenience and safety as a result of social and economic changes [1,2].They result from spatial changes based on population concentrations, and typical urban development activities include industrial construction, residential expansion, and maintenance of traffic networks for product transportation
The damage caused by natural disasters occurred 159 times over eight years in the target urban regions, and various rainfall characteristics were investigated in terms of disaster length in days and time duration in hours
Summary
Urban areas developed for convenience and safety as a result of social and economic changes [1,2]. They result from spatial changes based on population concentrations, and typical urban development activities include industrial construction, residential expansion, and maintenance of traffic networks for product transportation. Such urban infrastructures are called “gray urbanization” because they are constructed using highly durable cement and asphalt [3,4,5]. Many human lives have been lost and large financial losses have occurred because of urban inundation damage worldwide [8,9], including in the United States, Japan, Singapore, the United Kingdom, China, Italy, and South Korea [10,11,12,13]
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