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To extend the effective wave attenuation period range of free surface breakwaters, a study on the wave attenuation performance of a combined structure consisting of multiple surface-piercing boxes and submerged bars was conducted using Bragg resonance. A numerical wave flume was constructed utilizing the Desingularized Boundary Integral Equation Method (DBIEM) based on time-domain potential flow theory, and the interaction between regular waves and the combined structure of multiple equally spaced free surface boxes with submerged bars was calculated numerically. The occurring condition of Bragg resonance, reflection strength and wave attenuation performance of the combined structure were analyzed through reflection and transmission coefficients. The effectiveness of the numerical calculation method in this paper was verified by comparing the numerical results with existing literature data. The variation trend of transmission and reflection coefficients with 2S/λ (S is the center distance of adjacent structures, λ is the incident wavelength) is given. The results indicate that Bragg resonance occurs when regular waves propagate through multiple structures, and the wave attenuation performance of these multiple structures is significantly better than that of single structures. For multiple structures, as the number, width, and immersion depth of the boxes increase, the reflection intensity of Bragg resonance also increases. This not only reduces the transmission coefficient but also enhances the ability to dissipate long-period waves. Furthermore, increasing the gap between adjacent combined structures mainly aims to expand the effective range of the wave attenuation period. The submerged bars improve the wave-dissipating efficacy against long-period waves. This study provides valuable insights for the design of composite breakwaters.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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