JDR Vol.15 No.3 pp. 277-287
doi: 10.20965/jdr.2020.p0277


Developing Flood Inundation Map Using RRI and SOBEK Models: A Case Study of the Bago River Basin, Myanmar

Zin Mar Lar Tin San*,†, Win Win Zin*, Akiyuki Kawasaki**, Ralph Allen Acierto***, and Tin Zar Oo*

*Department of Civil Engineering, Yangon Technological University
Gyogone, Insein Road, Yangon 11011, Myanmar

Corresponding author

**Department of Civil Engineering, The University of Tokyo, Tokyo, Japan

***Institute of Industrial Sciences, The University of Tokyo, Tokyo, Japan

August 1, 2019
February 27, 2020
March 30, 2020
Bago River Basin, RRI model, SOBEK model, flood discharge, inundation area

The Bago River Basin in Myanmar is highly flood-prone. To develop a flood forecasting system, an inundation map of the Bago River Basin is required. This study applied the Rainfall-Runoff-Inundation (RRI) model and SOBEK model to simulate flood discharges and inundation to determine the model most suitable for analysis of the study basin in terms of user friendliness, cost, type of output, and correlation between simulated and observed data. In this study, five flood events were selected to calibrate and validate the models, using discharge data measured at Bago station. The Nash–Sutcliffe efficiency (ENS) and coefficient of determination (R2) were used to evaluate the performance of the models. The simulated flood inundation area was validated with satellite images. According to the comparison, the SOBEK model is more accurate than the RRI model, and the simulated and observed discharges are closely related. However, when the calculation time and cost are included in the consideration, the RRI model is preferable, as it is faster and freely available. For the Bago River Basin, the RRI model is efficient in predicting the potential flood duration and areas of inundation in near-real time, whereas the SOBEK model is useful for floodplain management. This study shows that the RRI and SOBEK models are applicable to any basin in Myanmar that is similar to the Bago River Basin.

Cite this article as:
Z. San, W. Zin, A. Kawasaki, R. Acierto, and T. Oo, “Developing Flood Inundation Map Using RRI and SOBEK Models: A Case Study of the Bago River Basin, Myanmar,” J. Disaster Res., Vol.15 No.3, pp. 277-287, 2020.
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