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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 43010 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Jamali, Mirmossadegh
- Abstract:
- Preservation and survival of ecological systems by vegetation is important. A study focusing on the hydrodynamics of these complex ecosystems could help to explain the filtering ability of vegetation in wetlands and estuaries. Wetlands assist in flood control, shoreline protection, and groundwater recharge. In addition, they play a purification role in removing sediments and contaminants from polluted waters, nutrient uptake, and oxygen production.
Laboratory experiments have been designed to study the influence of marsh vegetation on lateral dispersion in flexible vegetation that has been modelled with inclined cylinder. The flow through vegetation is modelled by a circulating flow going through an array of plastic dowels in an experimental flume. The study included flow discharges ranging from laminar to turbulent (90≤Red<400) and dowel densities ranging from sparse to dense (0.009≤Φ≤0.035). The lateral dispersion coefficient, Dy, has been estimated by releasing dye upstream of the array and measuring time series of concentration downstream of the array using image processing technique. The purpose of the present work is to estimate the required spatial and temporal scale for developing the lateral dispersion in vegetated flow. For Red<200, Experimental results indicate a decrease in non dimensional lateral dispersion coefficients with increasing Reynolds number in channel flow. Also the results show that by increasing the bending angle, the lateral dispersion coefficient, Dy increases. Theoretical predictions have good consistency with experimental results - Keywords:
- Lateral Dispersion Coefficient ; Emergent Vegetation ; Reynolds Number ; Flexibility ; Flexible Vegetation ; Wetlands
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