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Investigating Sediment Transport in Deep Reservoirs Using the 3D Numerical Model MIKE3

Eydpour, Danial | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55329 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Shamsai, Abolfazl; Ghaemial, Mohsen
  7. Abstract:
  8. Nowadays, in the world and our country, Iran, sediment transport and the phenomenon of sedimentation are of great importance. The entry of water flow with suspended sediments into the dam reservoir by floods with different return periods during the initial period of dam construction causes a considerable part of the helpful volume of the reservoir to be filled with sediments. As a result, the discharge of these sediments and the methods that exist in this field should be studied so that a large volume of reservoir water is not wasted during the discharge of these sediments. In this research, the opening time and extent of the bottom outlets of Qeshlaq Dam when the flood enters the reservoir of the dam has been investigated with the help of the 3D MIKE 3 model. So far, a suitable method for discharging the sediments of the Qeshlaq Dam has not been studied. The sediment discharging methods in this dam has caused a significant volume of water to be released from the reservoir. The QUICKEST third-order finite difference scheme was used to solve the diffusion and transmission equations. The Qeshlaq dam reservoir has been evaluated using floods with return periods of 2, 5, and 10 years. The most optimal mesh was determined using sensitivity analysis. The results of the research showed that in the amount of exploitation of 1535 meters, the time for the flow with suspended sediments to reach the dam for two and 5-year floods is 30.5 and 29 hours, respectively, and also in the amount of exploitation of 1545 meters, for floods of 2 5 and 10 years old are 31.5, 30 and 28 hours, respectively. In the amount of 1,535 meters for two and 5-year floods, the opening rate of the first outlet is determined as 25 and 30 percent, respectively. In the amount of 1545 meters, the opening percentage for the 2-year flood, 70% opening of the first outlet; 5-year flood, 55% opening of the first outlet and 100% opening of the second outlet; And for a 10-year flood, 75% of the opening of the first outlet and 100% of the opening of the second outlet have been determined. To ensure the accuracy of the results, the results obtained from the numerical model were compared with the results measured by the Iranian Water Resources Management Development Company. Statistical errors were calculated in four groups, and the results show the capability of the MIKE 3 three-dimensional model in simulating sediment and its transfer rate in the Qeshlaq dam reservoir
  9. Keywords:
  10. Flooding ; Sediment Transport ; Mike 3 Flow Model ; Particle Dilution Efficiency ; Finite Volume Method ; Discharge Coefficient ; Lower Outlets

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