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On the basis of plane shock wave hypothesis, the characteristics of local cavitation and bulk cavitation formation subjected to underwater explosion were theoretically and experimentally studied. The effects of structure dimensions and shock wave parameters on the cavitation formation were analyzed theoretically. Aiming at validating the local cavitation theory, an underwater explosion experiment in a 5-m diameter columned water tank was carried out. The explosion layout was as follows: 50-g TNT charge was placed at a 1-m stand-off away from a 1-m square and 2-mm thick steel plate. Results show that different structure dimensions can affect significantly the formation of local cavitation under the same shock wave parameters, and the quantity and depth of charges play an important role in the bulk cavitation formation. The experimental results basically agree with those of theoretical analysis.
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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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