Performance of FLO-2D software on flood inundation analysis

Date

2016

Author

Şahin, Ahmet Nazım

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Yeşilçay river basin is one of the main sources of İstanbul urban water supply system through the “Yeşilçay Drinking Water Plan”. Construction of two dams: Sungurlu Dam on Sungurlu stream and Osmangazi Dam on Göksu River have started to provide domestic and industrial water, flood control and energy production. Ağva is a small town which has population of about 2,500 in winter time but hosts around 15,000 people in the summer time located on the intersection of Göksu and Sungurlu streams called Yeşilçay river basin. In this study, the flood routing model applications for the Sungurlu and Osmangazi Dams are studied in order to identify risk areas and decide the strategies for flood prevention and protection for the Town Ağva. Interrelation between the variables such as computational grid size, DEM resolution, computation time and flood area is discussed after 150 runs of FLO-2D software with different settings. Twenty water level control points are set to record flood water levels and velocities. Around 1046 pieces of settlement is defined to the model by assigning reduction factors to the mesh elements. Furthermore, dam breach modeling results are also evaluated for different scenario and flood hazard maps are created by the mapper tool for each scenarios. The results represented that on the center of the Ağva for 100 years return peiod the average flow depth can be 1.5 m for Sungurlu Dam flood model and 2 m for Osmangazi Dam flood model. Also the backwater flooding occurrence on the river basin and the requirement of early warning system were observed.

Subject Keywords

Floods., Flood control., Flood routing., Flood dams and reservoirs.

URI

http://etd.lib.metu.edu.tr/upload/12620513/index.pdf
https://hdl.handle.net/11511/25923

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. N. Şahin, “Performance of FLO-2D software on flood inundation analysis,” M.S. - Master of Science, Middle East Technical University, 2016.