| Summary: | 碩士 === 國立高雄科技大學 === 海洋環境工程系 === 107 === In this study, the effect of wave-reducing energy reduction after rigid waves through rigid artificial vegetation and rigid submerged dikes is investigated by hydraulic test.
The reflectance and transmittance of the ultrasonic wave are measured to further understand the scattering effect of the wave field.
The wave-forming conditions of this test are set at a water depth of 0.25 m, a wave height of 0.025 m and a period of 0.65 sec to 1.1 s. Waves are generated by regular waves, and the rigid artificial vegetation model is arranged in a neat and regular manner.
According to Chen (2016) test results, it is suggested that the multi-row wave-reducing effect will be the best overall. Therefore, the test model is set to have a width of 0.3 m, 0.6 m, 1.2 m, 1.8 m, 2.4 m, and 3.0 m.
It is found that the average reflectivity of flexible artificial vegetation is reduced by 15% compared with rigid artificial vegetation, the average transmittance is reduced by 10%, and the effect in the shorter wave is more significant and consistent with the results of Chen (2016), while the rigid submerged reflection The rate and transmittance will be oscillating, and the transmittance will be around 0.8. It will not have a better effect as the levee width increases.
Therefore, the increase of the artificial vegetation model levee width does have better wave-reducing effect, and the flexible artificial vegetation can reduce the reflectivity and reduce the transmittance at the same time compared with the rigid artificial vegetation, but the endless increase It is not economical.
Therefore, the future will continue to find the best model design for future coastal protection design applications.
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