Abstract
Flume experiments were performed to test four plant mimics with different stiffness to reveal the effect of plant stiffness on the wave dissipation and turbulence process. The mimics were built of silica gel rod groups, and their bending elastic modulus was measured as a proxy for stiffness. The regular wave velocity distribution, turbulence characteristics, and wave dissipation effect of different groups were studied in a flume experiment. Results show that, when a wave ran through the flexible rod groups, the velocity period changed gradually from unimodal to bimodal, and the secondary wave peak was more apparent in the more flexible mimics. The change in the turbulence intensity in the different rod groups showed that the higher the rod stiffness, the greater the turbulence intensity. With an increase in the bending elastic modulus of a rod group, the wave dissipation coefficient increased. The increase in the wave dissipation coefficient was not linearly correlated with the bending elastic modulus, but it was sensitive within a certain range of the elastic modulus.
Highlights
Waves are one of the most important hydrodynamic force in coastal environments [1,2,3].The reduction of coastal erosion induced by waves is an important topic for coastal protection and morphological changes [4,5,6]
The planting of forests for wave attenuation in front of seawalls can reduce the arrival of waves, reduce the impact force of waves, and enhance the security of dams
(2) wave streaming causes turbulence when the wave propagates in in group means that the propagates from one intense interface to another interface, which can result the middle of the rod group
Summary
Waves are one of the most important hydrodynamic force in coastal environments [1,2,3]. It is known that different plant properties (e.g., density, stiffness, flexibility, arrangement mode, degree of submergence, and other factors) produce different influences on momentum transfer and the turbulence structure in canopy flow [7,8,9,10,11,12]. These related processes can lead to different sediment deposition patterns, which can influence the coastal morphology. Wave interactions between plants with varied stiffness have not been fully understood To investigate these interactions, Huang et al [17] designed a physical model with a rigid main trunk and flexible branches and leaves. The knowledge obtained by this study may provide a scientific reference for the planning and design of coastal protection projects
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