Mapping flood inundation in the Bago River Basin, Myanmar | |
| Author | Aung Myo Khaing |
| Call Number | AIT Thesis no.WM-14-01 |
| Subject(s) | Rain and rainfall--Simulation methods--Bago River Basin (Myanmar) Floods--Simulation methods--Bago River Basin (Myanmar) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | This study presents the generating of the flood inundation map in the flood plain area where data is limited in Myanmar. Bago river basin (5058 km2) is mountainous in the upstream portion and low land in the downstream and so flood occurs yearly including urban area of Bago city. There are 9 reservoirs, 1 diverted weir, many irrigation canals, gauged canals and sluice gates in the flood plain. The flood plain and east bank of Bago city were protected by earth embankments, levees. But the area of west bank of Bago city, some portion of Yangon-Mandalay highway in Bago city, many rural area and many crop lands are flooded every year in the raining season. There is a lack of study about flood mapping with hydrologic models and GIS environment in the area. Watershed of Bago river basin with accurate stream networks could not delineate from downloaded 30m ASTER and 90m SRTM DEM. The 10m resolution DEM was created in ArcGIS by using contour lines, point elevations, stream networks and channel survey maps of Bago River. The elevation data of contour lines and point elevations were digitized from topographic map of Survey Department and channel survey maps of DWIR, Myanmar. All data were combined and created DEM in ArcMap 10.1. The accuracy of created DEM was checked by comparing the stream networks and elevation points. That created DEM was applied in Soil and Water Assessment Tool, SWAT, to simulate discharge of Bago River. SWAT discharge value was checked with reservoir and without reservoir, Zuangtu reservoir. The model performance was checked with observed data of two stations, Zaungtu and Bago stations. Flood inundation map was generated for the area near Bago city, 30 km upstream and 35 km downstream of Bago city. Hydrodynamic 1-D model, HEC-RAS was applied to compute water surface elevation of Bago river and calibrated with observed water level data of Bago station. GIS environment, HEC-GeoRAS was applied to generate flood inundation map. The model result of flood inundation map was validated with ALOS PALSAR image of JAXA for the year 2006. The flood inundation map was classified for the degree of hazard based on flood depth. The return period flood was considered for 2, 5, 10, 50, 100, 200, 500 and 1000 years. Gumbel’s distribution method was applied in the return period calculation and peak discharge was calculated. Finally, flood hazard maps of different return periods were generated with HEC-GeoRAS. |
| Year | 2014 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Kawasaki, Akiyuki; |
| Examination Committee(s) | Babel, Mukand S.;Sutat Weesakul;Shrestha, Sangam;Kay Thwe Hlaing; |
| Scholarship Donor(s) | Ministry of Foreign Affairs, Norway; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2014 |