Effect of Mimic Vegetation with Different Stiffness on Regular Wave Propagation and Turbulence
1
Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510630, China
2
School of Marine Sciences, Sun Yat-sen University, Guangzhou 518000, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(1), 109; https://doi.org/10.3390/w11010109
Received: 28 September 2018 / Revised: 25 December 2018 / Accepted: 29 December 2018 / Published: 10 January 2019
(This article belongs to the Special Issue Coastal Vulnerability and Mitigation Strategies: From Monitoring to Applied Research
)
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.
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Keywords:
vegetation stiffness; bending elastic modulus; velocity distribution; turbulence intensity; wave dissipation
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MDPI and ACS Style
Tan, C.; Huang, B.; Liu, D.; Qiu, J.; Chen, H.; Li, Y.; Hu, Z. Effect of Mimic Vegetation with Different Stiffness on Regular Wave Propagation and Turbulence. Water 2019, 11, 109.
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