Abstract
This paper proposes a new approach to consider the uncertainties for constructing flood hazard maps for levee failure. The flood depth, velocity, and arrival time were estimated by the 2-Dimensional model and were considered as flood indices for flood hazard mapping. Each flood index predicted from the 2-D flood analysis based on several scenarios was fuzzified to reflect the uncertainties of the indices. The fuzzified flood indices were integrated using the Fuzzy TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution), resulting in a single graded flood hazard map. This methodology was applied to the Gam river in South Korea and confirmed that the Fuzzy MCDM (Multiple Criteria Decision Making) technique can be used to produce flood hazard maps. The flood hazard map produced in this study compared with the current flood hazard map of MOLIT (Ministry of Land, Infrastructure and Transports). This study found that the proposed methodology was more advantageous than the current methods with regard to the accuracy and grading of the flood areas, as well as in regard to an integrated single map. This report is expected to be expand upon other floods, including dam failure and urban flooding.
Highlights
Hazard maps aim to provide residents with information on the range of possible damage and disaster prevention activities [1]
This study aims to improve the methodology that is currently used to construct the flood hazard map in South Korea
Several flood hazard maps are produced for each flood frequency by overlaying the maximum flood depth and extent derived from flood inundation analysis and this methodology does not consider the uncertainties of flood indices
Summary
Hazard maps aim to provide residents with information on the range of possible damage and disaster prevention activities [1]. Flood hazard maps are among the representative nonstructural measures for reducing flood potential. Such maps are produced and utilized in different forms (i.e., flood trace maps, emergency action plan maps, and flood information maps) and for diverse purposes. Flood hazard mapping studies have been conducted in various countries as national research projects. In the United States, flood hazard mapping is an important part of the National Flood Insurance. Flood Insurance Rate Maps (FIRMs) are maintained and updated by FEMA’s (Federal Emergency Management Agency) flood hazard mapping program, which are called Risk
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