Theoretical and Experimental Assessment of Exchange Flow Between Canopy and Open Area

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Marvi, Samaneh | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39526 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Jamali, Mirmosaddegh
Abstract:
Wetlands and aquatic systems are abundant on the earth. Since many biological and chemical processes take place in aquatic regions, an understanding of hydrodynamics of flow in these areas is essential. Exchange flows or gravity currents driven by horizontal density gradients constitute a significant transfer mechanism in many lentic systems. Light blockage by emergent vegetations, which are a common feature of littoral zones, leads to a horizontal density gradient and hence an exchange flow between the vegetated and the open area. Also, existence of vegetations affects the behavior of the flow by inserting the drag force to the system and damping its energy. Previous studies have modeled the open water as a homogenous fluid (fully-heated open water column). However in reality, turbidity limits the depth of light penetration. So in this study, the problem of lock-exchange flow between canopy and partially-heated open water is modeled as a two-layer fluid. The objective of this thesis is to study the characteristics of the flow, including the flow rate, the toe velocity and the interface height at the junction and their dependency on a dimensionless drag parameter and light penetration depth
Keywords:
Drag Coefficient ; Exchange Flow ; Light Penetration Depth ; Vegetated Flow

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