Flood Hazard Mapping using Hydraulic Model and GIS: A Case Study in Mandalay City, Myanmar

Authors

  • Kyu Kyu Sein Department of Meteorology and Hydrology, Ministry of Transport Office No.5, Ministry of Transport, Nay Pyi Taw, Myanmar
  • Thida Myint Department of Meteorology and Hydrology, Ministry of Transport Office No.5, Ministry of Transport, Nay Pyi Taw, Myanmar

Keywords:

Flood frequency, HEC-RAS, Flood hazard, Return period, GIS.

Abstract

This paper presents the use of flood frequency analysis integrating with 1D Hydraulic model (HEC-RAS) and Geographic Information System (GIS) to prepare flood hazard maps of different return periods in Ayeyarwady River at Mandalay City in Myanmar. Gumbel’s distribution was used to calculate the flood peak of different return periods, namely, 10 years, 20 years, 50 years, and 100 years. The flood peak from frequency analysis were input into HEC-RAS model to find the corresponding flood level and extents in the study area.
The model results were used in integrating with ArcGIS to generate flood plain maps. Flood depths and extents have been identified through flood plain maps. Analysis of 100 years return period flood plain map indicated that 157.88 km2 with the percentage of 17.54% is likely to be inundated. The predicted flood depth ranges varies from greater than 0 to 24 m in the flood plains and on the river. The range between 3 to 5 m were identified in the urban area of Chanayetharzan, Patheingyi, and Amarapua Townships. The highest inundated area was 85 km2 in the Amarapura Township.

References

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Published

2022-11-24

How to Cite

Kyu Sein, K. ., & Myint, T. . (2022). Flood Hazard Mapping using Hydraulic Model and GIS: A Case Study in Mandalay City, Myanmar. Suan Sunandha Science and Technology Journal, 3(1), 14–20. Retrieved from https://li02.tci-thaijo.org/index.php/ssstj/article/view/270

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Section

Research Articles