Journal of Marine Sciences ›› 2019, Vol. 37 ›› Issue (4): 48-59.DOI: 10.3969/j.issn.1001-909X.2019.04.005

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Experimental investigation on irregular wave attenuation under the effects of vegetation with roots, stems and canopies

CHEN Jie1,2, GONG Shang-peng2, GUAN Zhi-xin3, ZHANG Zhu4, XIE zhen-dong2, LEI Jia-xin2, PENG Hao2   

  1. 1. Key Laboratory of Water Science and Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China;
    2. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China;
    3. Hunan Provincial Communications Planning, Survey & Design Institute Co. ,Ltd. , Changsha 410008, China;
    4. Department of Architectural Engineering, Hunan Technical College of Water Resources and Hydropower, Changsha 410131, China
  • Received:2019-06-03 Revised:2019-08-30 Online:2019-12-15 Published:2022-11-10

Abstract: Based on the theoretical analysis, wave flume experiments were carried out employing vegetation models with quantifiable root, stem and canopy. The attenuation characteristics of irregular wave height within the vegetation filed was investigated by a combination of water depth, incident wave height and vegetation distribution density. Variation of wave spectra associated with vegetation was studied using FFT. The results show that the vegetation models in this experiment have good wave-absorbing effect, but the boundary effect of vegetation wave attenuation is rare. The variation of irregular wave height along the flora is inconsistent with Mendez's theoretical curve most of the time. At the same time, there is no fixed variation of wave energy loss within different sections of the vegetation filed. In addition, the attenuation of wave energy is concentrated at the peak frequency, and increasing incident wave height result in a bigger difference between spectra values of transmitted wave and incident wave at peak frequency, while spectra of both transmitted wave and incident wave show similar bands. This study can provide a theoretical basis for using coastal vegetation to reduce shoreline erosion by surface waves.

Key words: irregular wave, vegetation, wave height attenuation, FFT

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