A case study on estimating the flood severity using flood hydrographs for small ungauged catchments in Korea

Title
A case study on estimating the flood severity using flood hydrographs for small ungauged catchments in Korea
Author(s)
최현일김응석[김응석]
Keywords
FLASH FLOODS; RAINFALL
Issue Date
201302
Publisher
MAEJO UNIV
Citation
MAEJO INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY, v.7, no.1, pp.94 - 106
Abstract
Local floods with rapid run-off and debris flow have posed a great potential threat of danger to life and property in recent years. Previous studies have examined the flash flood index determined by the characteristics of observed flood hydrographs such as rising limb, peak discharge and time to peak. To estimate the flood severity for small watersheds in Korea where the observed hydrograph is usually not available, this study proposes a flood hazard index (FHI) based on hydrographs generated from a rainfall runoff model for the annual maximum rainfall series of long-term observed data. The FHI is obtained by summing the relative severity factors measured by the ratios of characteristics of each flood to the highest recorded maximum value and implemented for two selected small ungauged basins in Korea. This study also presents regression equations between FHI and rainfall characteristics to predict the severity of flooding in small catchments. A stronger relation between FHI and maximum rainfall over a short interval demonstrates that heavy or excessive rainfall in a short period of time can cause a serious local flood in small watersheds.
URI
http://hdl.handle.net/YU.REPOSITORY/26618
ISSN
1905-7873
Appears in Collections:
공과대학 > 건설시스템공학과 > Articles
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