Abstract
Abstract. This study proposes an improved group decision making (GDM) framework that combines the VIKOR method with data fuzzification to quantify the spatial flood vulnerability including multiple criteria. In general, GDM method is an effective tool for formulating a compromise solution that involves various decision makers since various stakeholders may have different perspectives on their flood risk/vulnerability management responses. The GDM approach is designed to achieve consensus building that reflects the viewpoints of each participant. The fuzzy VIKOR method was developed to solve multi-criteria decision making (MCDM) problems with conflicting and noncommensurable criteria. This comprising method can be used to obtain a nearly ideal solution according to all established criteria. This approach effectively can propose some compromising decisions by combining the GDM method and fuzzy VIKOR method. The spatial flood vulnerability of the southern Han River using the GDM approach combined with the fuzzy VIKOR method was compared with the spatial flood vulnerability using general MCDM methods, such as the fuzzy TOPSIS and classical GDM methods (i.e., Borda, Condorcet, and Copeland). As a result, the proposed fuzzy GDM approach can reduce the uncertainty in the data confidence and weight derivation techniques. Thus, the combination of the GDM approach with the fuzzy VIKOR method can provide robust prioritization because it actively reflects the opinions of various groups and considers uncertainty in the input data.
Highlights
In South Korea, flood mitigation policy is not controlled by only one organization
The proposed fuzzy group decision making (GDM) approach can reduce the uncertainty in the data confidence and weight derivation techniques
Approach with the fuzzy VIKOR method can provide robust prioritization because it actively reflects the opinions of various groups and considers uncertainty in the input data
Summary
In South Korea, flood mitigation policy is not controlled by only one organization. The Ministry of Land, Infrastructure, Transport and Tourism (MLIT) has developed the comprehensive water resources plan of large dams and rivers to mitigate the flood damage and protect people’s properties and damages. Flood vulnerability can be effectively identified if multi-criteria decision-making (MCDM) techniques are employed to aggregate various opinions and factors. G. Lee et al.: Group decision-making approach for flood vulnerability conflicting and uncertain, based on the aggregated opinions of all stakeholders. The VIKOR (VlseKriterijumska Optimizacija I Kompromisno Resenje in Serbian) method is another MCDM method that employs aggregating functions; it focuses on compromising solutions for a prioritization problem with conflicting criteria, which can help decision makers obtain final solutions (Opricovic and Tzeng,2007). This approach was subsequently employed to quantify the flood vulnerability of the southern Han River basin in South Korea where.
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