三溪浦水库组合结构型式溢洪道水工模型试验研究

Hydraulic Model Test Study on the Combined Type Spillway of the Sanxipu Reservoir

浙江省鄞州区三溪浦水库为一座中型水库,溢洪道采用开敞式布置,溢流堰由正堰和侧堰组成,进口结构型式及水流条件复杂,理论计算较难把握。为验证维修加固工程溢洪道水力计算的合理性,按SL 253—2000《溢洪道设计规范》要求进行了模型试验研究。通过各工况下过流能力、水流流态、压力分布、流速分布、水流空化数等方面的综合分析研究,率定出了较为翔实可靠的流量系数、泄槽边墙高度、明渠底坡等设计参数,为优化调整设计和今后水库科学调度提供了可靠依据。

The Sanxipu Reservoir in Yinzhou district,Zhejiang province is a medium reservoir.Its spillway is adopted with open type,and the overflow weir is composed of the positive weir and the side weir.The theoretical calculation is difficult to grasp because of the structural type and flow condition of the inlet are complicated.In order to verify the rationality of the hydraulic calculation of the spillway for the maintenance and reinforcement engineering,the model test is carried out according to the requirements of the spillway design specification（SL 253—2000）.Through a comprehensive analysis and research under the condition of flow capacity,flow pattern,pressure distribution,velocity distribution and flow cavitation number,this paper determinesa more accurate and reliable flow coefficient,the height of the side wall of the discharge chute and the bottom slope of the open channel.And also provides a reliable basis for optimizing the adjustment design and the future reservoir scientific scheduling.