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Development of a River Bridge Risk Assessment Using the AHP-PROMETHEE Method: A Case Study of Miho River Basin

Lee Jongso 1,  Pyo HeeJin 1,  Lee Sangeun 1

1국토연구원

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ABSTRACT

With the increase in both frequency and intensity of extreme rainfall caused by climate change, the risk of damage to people and infrastructure is also growing. This study aims to develop a risk assessment method for river bridges that considers both climate-related factors and the spatial characteristics of the structures. A multi-criteria decision making approach combining the Analytic Hierarchy Process (AHP) and Preference Ranking Organization Method for Enrichment Evaluation (PROMETHEE) has been applied to ensure an objective and quantitative evaluation of risk. The assessment framework includes ten indicators across three categories: functional adequacy, exposure characteristics, and spatial vulnerability. The relative weights of these indicators were determined through expert surveys. Using this method, eight high-risk bridges were initially selected from 41 bridges in the Miho River basin. Field surveys were then carried out to examine the actual risk factors, and three bridges were finally identified as the most high-risk. The proposed AHP–PROMETHEE based approach offers a practical and transparent tool for decision making. It may also be extended to other infrastructure management such as levees and steep slopes in future climate adaptation and maintenance planning.

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