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Numerical and Laboratory Modeling of the Movement of Stems of Aquatic Plants under the Effect of Waves

Khaleghi Nezhad, Hojat | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58157 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosadegh
  7. Abstract:
  8. Studying the dynamics of submerged and semi-submerged plant stems in shallow waters is important because it affects environmental processes and the stability of coastal ecosystems. The stems play a key role in ecosystem management by influencing wave energy dissipation. One of the effective parameters in stem dynamics is structural damping, which hasn't really been included in numerical models describing stem behavior before. In this research, two numerical models were developed to study the stem motion under waves; one model was for small deformations and the other one for large deformations. The results showed that both models predicted the stem dynamic behavior with quite good accuracy. The average error in predicting the natural frequency of stem oscillation was around 5%. Free oscillation tests in still water revealed that the added mass coefficient was around 1.25 and the drag coefficient was about 3.49. Including damping in the models decreased the error of amplitude and period in single-stem experiments by roughly 2%. The numerical model was able to predict resonance in stem oscillations. Adding damping also reduced the RMSE error index by around 7% in resonance tests. The experiments showed that increasing vegetation density reduces wave energy and stem oscillation amplitude. The sensitivity analysis of the large-deformation model showed it is more sensitive to changes in drag coefficient, added mass, and wave height, while its sensitivity to lift coefficient, body friction coefficient, and damping was less
  9. Keywords:
  10. Aquatic Plants ; Flexible Vegetation ; Structural Damping ; Surface Waves ; Large Deformation ; Aquatic Stem Dynamics

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