Effect of Flexible Vegetation and their Variation Density Through Water Depth on Vertical Diffusion

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Sahebi, Reza | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46324 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Jamali, Mirmosadegh
Abstract:
Nowadays, vegetations have an important role in protecting ecological systems. One of the impacts of vegetation in water system is pollution diffusion. The physical characteristics of plants, affect how vegetation influence the diffusion phenomenon. Plants’ flexibility may change the drag force and pollution diffusion. Also density variations of vegetation in depths have important affects on flow characteristics.
In this study we investigate experimentally the affects of flexible vegetations and their density changes in depths on vertical mass transport. Thus the current flume has modeled for crossing flow through the plants. To model the steep plants, inclined rigid cylinders have been used, the densities of which vary depending on depth. Vertical diffusion coefficient was calculated by injecting dye discharged in canopy and image processing techniques in MATLAB. Experimental results indicate that vertical diffusion coefficient is much more in inclined plants and also the coefficient id smaller in the more dense layers than the less dense layers
Keywords:
Vertical Diffusion ; Vegetated Flow ; Density Variation ; Image Processing

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