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Comparison of Lateral Dispersion in Flexible and Semi-Rigid Emergent Aquatic Canopies with Staggered, Random, and In-Line Arrangements

Bakhshandeh Nowruz Mahalleh, Fatemeh | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55850 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jamali, Mirmosadegh
  7. Abstract:
  8. Hydrodynamics of flow is affected by physical and biological interactions between flow and aquatic vegetation. This study represents the role of array distribution on lateral dispersion in emergent aquatic vegetation using two flexible and semi-rigid models. Experiments were carried out with three different arrangements, including random, staggered, and in-line. The Reynolds numbers at the stem scale ranged from 120 to 690, and the stem densities were 1% and 1.44%. Furthermore, the effects of stem flexibility and, specifically, stem resonance on lateral dispersion were examined. An image processing technique was used to measure plume width and calculate lateral dispersion. It was found that the staggered arrangement had the largest lateral dispersion coefficient, followed by random and then in-line arrangement. For flexible canopies, dispersion increased with Reynolds numbers. However, in semi-rigid stems, this was independent of Reynolds numbers for Reynolds numbers above 370. Moreover, the lateral dispersion coefficient increased with vegetation density as well as stem flexibility. Canopies in a resonance state had a significantly higher coefficient when the vortex shedding frequency matched the natural frequency of stems
  9. Keywords:
  10. Lateral Dispersion Coefficient ; Image Processing ; Flexible Vegetation ; Wetlands ; Resonance ; Flexible Emergent Canopy ; Aquatic Plants ; Canopy Arrangement

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