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JDR Vol.17 No.6 pp. 901-912
(2022)
doi: 10.20965/jdr.2022.p0901

Paper:

Probable Flood Inundation Depth and Extent in the Chao Phraya River Basin for Different Return Periods

Shakti P. C.*1,†, Mamoru Miyamoto*2, Daiki Kakinuma*2, Ryohei Misumi*1, Anurak Sriariyawat*3, and Supattra Visessri*3,*4

*1National Research Institute for Earth Science and Disaster Resilience (NIED)
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan

Corresponding author

*2International Centre for Water Hazard and Risk Management under the auspices of UNESCO (ICHARM),
Public Works Research Institute (PWRI), Tsukuba, Japan

*3Department of Water Resource Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand

*4Disaster and Risk Management Information Systems Research Unit, Faculty of Engineering, Chulalongkorn University, Bangkok, Thailand

Received:
December 1, 2021
Accepted:
August 12, 2022
Published:
October 1, 2022
Keywords:
return period rainfall, hyetograph, hydrological simulation, flood inundation, Chao Phraya
Abstract

Understanding the potential flood inundation depth and extent over river basins can provide a reference for understanding and mitigating the flood risk. However, the development of design hyetographs for the evaluation of flood inundation under extreme rainfall is challenging. We evaluated the flood inundation depth and extent in the Chao Phraya River Basin, one of the largest river basins in Asia, which is often vulnerable to water-related disasters. Rainfall data from 119 stations within the basin were collected for a frequency analysis. After processing the 36-year daily rainfall data, a frequency analysis of the maximum monthly rainfall was performed at each station using the Gumbel distribution. The maximum monthly rainfall for various return periods varied substantially among stations. For an inundation analysis over the entire river basin, we produced design hyetographs by integrating extreme rainfall values for each month according to the return period. These design hyetographs were included in a rainfall-runoff-inundation model to simulate the maximum inundation depth profile over the basin for different return periods. The Maximum inundation depths were 8.3, 9.0, 9.7, and 10.5 m for return periods of 50, 100, 200, and 500 years, respectively, over the Chao Phraya River Basin. Similarly, approximately 16.3%, 17.1%, 17.8%, and 18.6% of the basin area was inundated (depth > 0.5 m) over the return periods, respectively. The results of this study provide a good reference for risk analyses and evaluations of the Chao Phraya River Basin.

Cite this article as:
Shakti P. C., M. Miyamoto, D. Kakinuma, R. Misumi, A. Sriariyawat, and S. Visessri, “Probable Flood Inundation Depth and Extent in the Chao Phraya River Basin for Different Return Periods,” J. Disaster Res., Vol.17 No.6, pp. 901-912, 2022.
Data files:
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