溢流坝的差动式挑流鼻坎,由于其消能效果好,原为工程界乐于采用的消能方式.根据一些试验资料,其冲坑深度可比连续式鼻坎小50%左右.柘溪水电站溢流坝下游消能也采用了差动式挑流鼻坎,经几次洪水过流,均发生了较严重的气蚀.虽经采用各种方法进行修补,终未找到较为妥善的减免气蚀的措施.后来,工程界曾普遍出现了一种否定差动式鼻坎的趋势,还有人建议将柘溪差动式鼻坎改建成连续式鼻坎.1978年6月在南京举行的全国高速水流学术讨论会上,华东水利学院提出了一篇讨论差动式鼻坎气蚀特性的论文,引起与会代表的关注;但考虑到气蚀现象的复杂性,会议建 Due to its good energy dissipating effect, the overflow pick-up nose of overflow spillway was originally a energy-dissipating mode that is favored by the engineering industry.According to some test data, the depth of scouring pit can be about 50% smaller than that of continuous nose ridge. In the downstream of the overflow dam of Xiaoxi Hydropower Station, a differential pick-and-flow nose ridge was adopted for energy dissipation. After several floods overcurrent, serious cavitation occurred, and although various methods were used to remedy the problem, no satisfactory results were found Later, there was a general trend in the engineering industry to negate the differential nasal cannula. Others suggested the conversion of the Suixi differential nasal ridge into a continuous nasal ridge. It was held in Nanjing in June 1978 Of the National Symposium on High-Speed ​​Flow, Huadong Hydraulic Institute presented a paper discussing differential cavitation cavitation characteristics of the thesis, aroused the concern of delegates; but considering the complexity of cavitation phenomenon, the conference built