闽江水口水电站下游航道设计最低通航水位确定方法

为了给闽江航道整治、码头建设、防洪、船闸设计提供技术参数，在外业资料缺乏情况下，采用数值模拟、外业观测、相关分析相结合的方法计算闽江水口水电站下游航道设计最低通航水位。基于非结构网格、有限体积法建立闽江干流水口水电站至马尾河段的二维水动力数学模型，通过数学模型推算闽江水口水电站下游航道沿程临时站点逐时水位，将沿程临时站点逐时水位与竹岐站、文山里站、白岩滩站等长期水文站(基准站)水位建立相关关系，采用累积频率法计算低潮累积频率90%的水位特征值作为基准站设计最低通航水位，通过该相关关系计算沿程临时站设计最低通航水位。计算结果表明，临时站逐时水位与基准站逐时水位线性相关关系较好，相关系数基本在0.9以上，由该相关关系及基准站设计最低通航水位获得的闽江干流水口水电站下游航道设计最低通航水位值相对合理可靠。

Calculation method of design lowest navigable water level for downstream channel of Minjiang Shuikou Hydropower Station

In order to provide technical parameters for waterway regulation, wharf construction, flood control and lock design of the Minjiang River, in the absence of field data, numerical simulation, field observation and correlation analysis were used to calculate the lowest navigable water level in the downstream channel of Minjiang Shuikou Hydropower Station. Based on unstructured grid and finite volume method, a two-dimensional hydrodynamic numerical model was established from Shuikou Hydropower Station at the Minjiang River to the Mawei River, which was used to calculate the hourly water level at the downstream channel of the hydropower station. The hourly water level of the downstream channel was used to establish the correlation with the water level of Zhuqi, Wenshanli, Baiyantan and other long-term hydrological stations (base station). The cumulative frequency method is used to calculate the water level characteristic value of 90% of the cumulative frequency of the low tide as the design lowest navigable water level of the reference station. The calculation results show that the linear relationship of the hourly water level is well correlated between base stations and temporary stations with a correlation coefficient higher than 0.9, indicating a rational and reliable design lowest navigable water level.