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Laboratory Investigation of Dispersion under Interaction of Surface Waves and Flexible Stems

Hadian, Alireza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56968 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosadegh
  7. Abstract:
  8. This experimental study investigates the interaction between surface waves and flexible stems in aquatic environments, focusing on the case where the wave frequency is close to the natural frequency of the stems. Aquatic plants have significant structural and ecological effects on aquatic environments, inducing various changes in the flow passing through them. In this research, a polyurethane stem model is used, which is submerged and randomly placed in water. The oscillation amplitude and pollutant dispersion are investigated. The experiments were conducted at four frequencies of 0.7, 0.83, 1, and 1.125 Hz, two wave heights of 2 and 3 cm, and two densities of 0.8 and 1.2%. Image processing techniques are employed to analyze the experiments. In addition, a potassium permanganate solution was used as a colored tracer for pollutant dispersion. The results demonstrate that the oscillation amplitude of the stems is larger than the orbital movement of particles due to the wave presence within the resonance range. In this range, the width of the pollutant cloud increases over time, and the lateral dispersion coefficient increases by up to 40% compared to the non-resonance condition. Moreover, the lateral dispersion coefficient is directly related to the vegetation density, and it increases by approximately 15% with increasing density. These findings provide insights into the behavior of flexible plants in aquatic environments
  9. Keywords:
  10. Transverse Dispersion ; Sloshing ; Resonance ; Oscillations ; Flexible Stems ; Pollutants Dispersion

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