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The Effect of Wind on the Oscillation of Stems of Semi-submerged Aquatic Plants

Behnamtalab, Mohsen | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58504 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosadegh
  7. Abstract:
  8. This study aimed to analyze the oscillatory behavior of semi-submerged plant stems under wind action in aquatic environments. In the first stage, a numerical model based on the finite difference method was developed to simulate the dynamic response of the stems under the influence of wave and current forces, followed by the incorporation of wind effects. The numerical model results were validated against experimental data obtained from laboratory flume tests. The comparison indicated that the model was capable of predicting stem displacements with a mean error of approximately 15–20%. In the experimental phase, the natural frequency and oscillation amplitude of the stems were examined under various wind speeds and water depths. The findings revealed that wind can, under certain conditions, shift the oscillation frequency of the stems closer to their natural frequency. The average deviation between the natural frequency and the oscillation frequency during wind exposure was less than 5% across different water depths. Analysis of oscillation amplitudes along the vegetative canopy showed that mid-canopy stems exhibited larger oscillation amplitudes than edge stems, while the wind influence diminished toward the downstream end of the canopy. Increasing wind speed from 3 to 7 m/s resulted in a significant amplification of stem oscillations, with mean amplitude increases of approximately 216% at a water depth of 18 cm and 115% at 26 cm. This indicates that the sensitivity of oscillation amplitude to wind speed at shallower depths was about 50% greater than at deeper ones. Furthermore, the oscillation frequency analysis within the vegetative canopy demonstrated that upstream stems generally had lower oscillation frequencies than those located at the downstream end. Overall, the findings of this research contribute to a deeper understanding of the interactions between vegetation and hydrodynamic conditions in wetlands and natural aquatic environments and can be utilized to optimize the design of engineered ecosystems
  9. Keywords:
  10. Natural Frequency ; Numerical Modeling ; Oscillation Amplitude ; Semi-Submerged Plants ; Stability in Aqueous Medias

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