Abstract
In order to explore the hydrodynamic characteristics of roughness elements in a natural riverway and probe their influences on the habitat of aquatic organisms, a hydrodynamic mathematical model was constructed with a cylindrical roughness element as an example to carry out a three-dimensional (3D) numerical flow model research. Moreover, the reliability of this model was verified through a physical model experiment. Research results showed that when water flowed through the cylindrical roughness element, a low-velocity region was formed in front of this element due to the water-resistance of obstacles. This region developed towards two sides at the back of this cylindrical roughness element, thus forming a local high-velocity region. Finally, a low-velocity wake flow region was formed in the rear, presenting evident Karmen vortex street characteristics. The relevant research results will provide a reference for governing the ecological environment of riverways and improving the habitat of aquatic organisms.
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