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Dynamics of bubble oscillation formed during underwater explosions were studied in a 2 m×2 m×2 m water tank. The theory of shock absorption when elastic wave transmits from high acoustic impedance material to low acoustic impedance material was used. The walls of the water tank were covered with a layer of material having low acoustic impedance. With this set up, the bubble oscillates without influence of the shock waves that reflected from the walls of the water tank. The pressure was measured by piezoelectric pressure transducers, and the explicit pictures of the bubble oscillations and water jet were captured by a digital high speed camera. Another experiment was carried out in an 8 kg test pond to validate the water tank experimental data. The results of the underwater explosion in a water tank are in good agreement with the results getting from the test pond, and the maximal relative deviations between two experimental results is 5.1%. This method is simple and efficient for studying bubble oscillation phenomena.
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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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