Effect of Submerged Flexible Vegetation on Vertical Mixing Coefficient

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Taheri Paqale, Ahmad | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47230 (09)
University: Sharif University of Technology
Department: Civil Engineernig
Advisor(s): Jamali, Mir Mosadegh
Abstract:
Environmental flows are seldom independent of plants impact. Aquatic canopies are mostly submerged and flexible; this causes a significant impact on Hydrodynamics of flow and mixing structure. Experimental and analytical investigation of vertical mixing in vegetation canopies with flexible submerged vegetation is the aim of this study. Most of the previous studies on flexible submerged vegetation were conducted to study the transverse and longitudinal mixing. In this study, flexible submerged vegetation in the density range of 2.8% to 4.2% was used to study the vertical mixing.The concentration profiles at four separate stations were obtained by image processing. The results for the vertical mixing coefficient were compared with analytical values. The experiments cover the range of 600-1600 for the Reynolds Number based on the stem diameter. 45 experiments were conducted for five discharges, three different height ratios, and three vegetation densities. It was observed that vertical mixing coefficient increases with an increase in both vegetation density and the Reynolds Number
Keywords:
Image Processing ; Vegetated Flow ; Mixing Process ; Vegetation ; Aquatic Flows ; Flexible Submerged Vegetation

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