Abstract
Water energy is a conventional source of source that is widely available in nature. It can be easily converted into high quality secondary energy-electric energy through hydroelectric power stations. Hydropower is not only a widely used conventional energy source, but also a renewable energy source. Moreover, hydroelectric power has no pollution to the environment. Therefore, water energy is an inexhaustible and high-quality energy source among many energy sources in the world. However, vegetation can change flow structure and turbulence characteristics, impacting the use of water energy. In previous researches, few studies have focused on the comparison of velocity and turbulence influenced by various vegetations. Therefore, laboratory experiments were carried out to investigate hydrodynamics affected by submerged rigid vegetation (reed and wooden stick) and merged flexible vegetation (grass and chlorella) under different conditions. The time-averaged velocity distributions of planted floodplain are not logarithmic. Instead, reed and wooden stick followed an “S-shape” profile, but for grass and chlorella, they presented reverse S-shape profile. For all cases, turbulence is not isotropic and the change law of turbulence intensity is different in different sections.
Highlights
The vegetation, as a significant ecological element of natural rivers and riparian systems, plays an important role in the river bio-engineering. It can generally have an important role in altering the flow resistance, the flow structure and distribution, as well as sediment suspension and transport rate and impacting on the ecosystem and morphology greatly [1][2][3]
The primary objective of this study was to investigate the influence of various vegetation on the hydrodynamic characteristics of vegetated channel
The magnitude of the mean velocity for the wooden stick is more than others because the wooden stick consumes much less energy and momentum from the flow through the generation of turbulence
Summary
The vegetation, as a significant ecological element of natural rivers and riparian systems, plays an important role in the river bio-engineering. It can generally have an important role in altering the flow resistance, the flow structure and distribution, as well as sediment suspension and transport rate and impacting on the ecosystem and morphology greatly [1][2][3]. Aquatic and riparian vegetation has recently garnered considerable attention in the management and restoration of rivers and coastal ecologies [4] [5]. Effects of vegetation on flow have drawn wide attentions. In this paper, the flow velocity and turbulence intensity of various types of vegetations under different hydrodynamic conditions were investigated and compared
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