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    Numerical Rehabilitation in Stream Crossings After the February 6, 2023 Earthquakes
    (2025) AYDOGDU, MAHMUT
    Earthquakes can cause topographic changes and increase the risk of flooding by changing the structure and route of the river channel. The Pazarcık and Elbistan earthquakes that occurred on February 6, 2023, were also flood-triggering earthquakes. In this study, numerical solutions were performed with the HEC-RAS software as a rehabilitation study against the flood-triggering effect of earthquakes. The Sarsap Train Station region located in Yazıhan, Malatya was selected as the study area. As there was no road for vehicle connection before, after the earthquake to provide a non-stop connection with the station a bridge structure on the Eskiköprü Stream (Kuruçay) was modeled in the HEC-RAS environment. Firstly, flood recurrence flow rates were calculated using the DSI Synthetic Method. Then, the Manning roughness coefficient (n) was found according to the Modified Cowan Method. In the HEC- RAS calculation, 33 cross-sections were taken at 20 m intervals from downstream to upstream. Additionally, a bridge section with 6 gaps and 26 m width was defined to the software at Km: 0+175.00 which is the section at the most suitable distance to the station. As the result of the solutions made according to the 100-year flood flow, water surface profiles were obtained both in the bridge section and all other sections, and it was seen that the flood flow rate conveniently passed through all sections, including the bridge section. It can be said that in the rehabilitation works that will be carried out in the region, especially about the flood risk after the earthquake, this study will both reduce the risk of flood and provide a smooth connection to the station with the highway.
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    Testing the Reliability of Numerical Model Studies for a Broad-Crested Weir
    (2024) AYDOGDU, MAHMUT
    The increase in population causes the need for water to increase day by day. The fact that water resources are limited further emphasizes the effective use of water. For this purpose, level-flow control of water transmitted through open channels is very important. Broad-crested weir types are widely used in these controls carried out through weirs. This study used a newly designed broad-crested weir type that had not been used before. The model created in the laboratory environment was tested for Q=7.84 l/s and Q=14.86 l/s flow rates. The experiments measured water surface profile, flow depths, and velocity values. The same model was tested in the numerical environment under similar flow conditions. For this purpose, three-dimensional solutions were performed with Ansys-Fluent software. The Realizable k-? turbulence model, which has been tested for reliability in previous studies and is suitable for this type of broad- crested weir flows, was preferred. In the numerical solution, the VOF method was used for the water-air interface. Thus, the data belonging to the numerical model was verified using experimental data. In general, it was observed that there was an agreement between the experimental and numerical data in terms of water surface profile, flow depths and velocities. As a result of this study, it can be said that it allows different broad-crested weir designs to be tested with less cost before moving on to field applications.