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Accident pump-stopping water hammer is a technical problem that needs to be highly valued in long-distance pressurized water diversion projects. This paper carried out calculation and analysis of hydraulic transition process on the Oujiang River Diversion Project. The loss of power accident of four pumps under maximum lift was taken as control condition, and the loss of power accident of single pump was taken as verification conditions. The optimization of pump outlet valve closing law was taken as the main water hammer protection measure. The research shows that when the butterfly valve at the outlet of the pump refuses to operate, the pressure and flow in the pipeline fluctuate more violently than that of the single pump during pump trip accident, and the reverse speed of the pump does not meet the specification requirements. By adopting the two-stage broken line closing law of the pump outlet butterfly valve, a better water hammer protection effect can be obtained.
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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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