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Outline
The near-seabed explosion shock wave can cause serious damage to such facilities as submarine optical cables and pipelines. The spatiotemporal evolution of the underwater explosion shock wave can be affected by the impedance of different types of substrate. Therefore, it is of great significance to study the near-seabed explosion shock wave load under different substrate conditions. Based on the coupled Eulerian-Lagrangian (CEL) method, a numerical model of near seabed explosion is established to investigate the effect of seabed material on the shock wave load of near seabed explosions. The results show that the seabed material significantly affects the peak pressure of the shock wave within a certain range of measuring point angles of 20°–50°. The reflection effect of the near seabed increases with the increase of the explosion distance ratio within a certain range of measurement point angles of 20°–50°. When the measurement point angle exceeds this range, this phenomenon gradually disappears. The effect regions of these two types of seabed sediment are similar while their reflection coefficients are significantly different. When the seafloor sediment is soft, the reflection coefficient near seafloor ranges from 0.81 to 1.05. However, when the seafloor sediment is hard, the reflection coefficient near seafloor ranges from 0.98 to 1.33. The water depth has little effect on the peak pressure of the shock wave.
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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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