Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi Üniversitesi, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2014
Student: NAZLI PALAMUT
Supervisor: MÜSTEYDE BADUNA KOÇYİĞİT
Open Archive Collection: AVESIS Open Access Collection
Abstract:Dam Break Analysis is an important and essential study in determining flood behavior and defining risks on residential, commercial or agricultural areas located in dam's downstream regions. In the scope of this thesis, Dam Break Analysis of Rahmanlar Dam, which is under construction in Ödemiş, İzmir with 3 villages in the downstream area, has been carried out with one and three dimensional numerical models. The main purpose of these simulations was to define whether or not the flood wave after dam break reaches to the villages. For one dimensional analysis, the HEC-RAS (Hydrologic Engineering Centers River Analysis System) software developed by US Army Corps of Engineers National Weather Service and for three dimensional analyses, the FLOW-3D Computational Fluid Dynamics software developed by Flow Science has been used. The results of one dimensional dam break analysis obtained from HEC-RAS model set up under different scenarios have shown that some residential areas in the downstream region of the Rahmanlar Dam could be under water due to flooding arising from the dam failure. However, since the flow is assumed to proceed straightly from one section to another section along flood path in one dimensional dynamic analysis, three dimensional modeling enables improved representation of physical properties/characteristics of topography and boundaries, thus describing the flood flow in detail and more realistically. Due to increased computational effort, only the most critical dam break scenario according to one dimensional simulation results has been analyzed with FLOW-3D. Flooded areas have been mapped according to the results of both analysis obtained by one and three dimensional simulations and the residential areas, the maximum water surface elevations and the time of occurrence of peak discharges have thus been determined. It can be concluded that one dimensional models can safely be used in an emergency case of dam break to determine the areas that could be under treat while three-dimensional models can be applied when sufficient time and resources are available for more detailed investigations and risks.