An Approach to Flood Hazard Mapping for the Chao Phraya River Basin Using Rainfall-Runoff-Inundation Model
October 1, 2022 - Sriariyawat, Anurak; Kimmany, Bounhome; Miyamoto, Mamoru; Kakinuma, Daiki; Shakti, P. C.; Visessri, Supattra
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EmailJournal or Book Title: JOURNAL OF DISASTER RESEARCH
Abstract: Flooding is a major natural hazard that can cause significant damage to socioeconomic and ecological systems. This study presents an approach to pro-ducing the maximum flood inundation and flood duration maps over the Chao Phraya River Basin (CPRB), Thailand. An integrated numerical model and spatial analysis tool were utilized in this study. The Rainfall-Runoff-Inundation (RRI) model was first used to simulate both river discharge and inunda-tion depth. Then, the maximum flood inundation and flood duration maps with different return periods were estimated using a Geographical Information Sys-tem (GIS) tool. The results illustrate that the flood in-undation areas were spread out, starting from Nakhon Sawan Province, which is located in the central part of the basin. The maximum flood inundation depth could reach up to approximately 7.71, 8.28, and 8.78 m for the flood return periods of 50, 100, and 200 years, re-spectively. The results also indicate that the inunda-tion areas over the CPRB could cover approximately 21,837, 23,392, and 24,533 km2 for flood return peri-ods of 50,100, and 200 years, respectively. The longest flood durations for return periods of 50, 100, and 200 years were approximately 159, 177, and 198 days, respectively. The longest flood duration occurred in the vicinity of the Nakhon Sawan. This study sug-gests that flood inundation areas and duration map-ping could provide supporting information regarding the impacts caused by varying degrees of flood haz-ards and can be used to enhance comprehensive disas-ter risk management planning.
Type of Publication: Article