为研究溢洪道水力特性，验证工程设计方案合理性。基于SolidWorks软件建立溢洪道三维数值模型，使用Fluent软件，运用VOF方法和RNG k-ε 湍流模型闭合N-S方程，对沟水坡水库溢洪道进行数值模拟。通过数值模拟得到的溢洪道水力特性数据与物理模型试验结果进行分析对比，并进一步分析溢洪道水流沿程变化规律，研究表明数值模型的可信度较高，可采用数值仿真方法对溢洪道结构进行优化。同时发现在30 a一遇洪水工况下溢洪道混凝土护坡高度不能满足正常泄洪的问题，提出在斜坡段设置两级水垫塘、加高消力池段护坡高度和缩短尾水渠长度的优化方案；利用数值模拟，分析验证了优化方案的可行性，为工程设计优化提供依据。研究成果为同类溢洪道工程采用数值仿真模拟提供了技术支撑。

The spillway is an important structure to ensure the safe discharge of the reservoir and the safe operation of the dam body. In order to ensure the safe operation of the spillway, the hydraulic characteristics of the spillway of the Goushuipo Reservoir reinforcement project were tested and studied, and the engineering design was validated and optimized. Based on SolidWorks software, the three-dimensional numerical model of the spillway of the Goushuipo Reservoir was established by the VOF method, and the closed N-S equation of RNG k-εturbulence model were used to simulate the spillway of the Goushuipo Reservoir reinforcement project by Fluent software. Based on the conditions of 30-year flood and 50-year flood, the data of spillway water surface line simulated by mathematical model was slightly different from that measured by physical model only in the silting pool, and the maximum deviation of water surface line was 9.2%. Using numerical simulation method to correct and simulate the original design scheme had higher simulation accuracy and reliability.The relation function of water level and discharge was established, and the variation law of water flow along the spillway was analyzed. Under the design conditions, the flood level of the stilling pool and the tail channel of the reservoir exceeded the top of the slope protection. The reason why the concrete slope protection height of the spillway could not meet the normal flood discharge under the 30-year flood condition of the Goushuipo reservoir reinforcement project was deeply analyzed. An optimization scheme was proposed to set two-stage water mat in the slope section of the reservoir, increase the slope protection height of the silencing pool section and shorten the length of the tail channel. The numerical simulation results showed that the rhomboid flow in the slope section of the spillway was destroyed, and the discharging energy of part of the flow was reduced. After the flood enters the silencing pool, the rolling degree of the flow was weakened, the flow state was relatively stable, and the energy dissipation effect was remarkable. The water surface line of steep slope section, stilling pool and sea section of bend did not exceed the top of slope protection. Based on the optimization scheme, the problem that the slope protection height of spillway can not discharge floodwater normally under the design condition was solved, and the scheme provided a reference for engineering optimization design.Through comparison and analysis of the numerical simulation results of the spillway of Goushuipo reservoir with the physical model test results, the numerical simulation method have high accuracy and reliability, and the numerical simulation method can be used to study and analyze the hydraulic characteristics of the spillway along the water surface elevation, flow velocity and flow pattern, pressure, discharge, and energy dissipation and erosion evolution law and to optimize the spillway structure in a targeted manner. The relationship function of water level and discharge obtained by fitting analysis provides a reference for design and operation. The research results provide technical support for numerical simulation of similar spillway projects.