中文摘要：

为阐明峡江水利枢纽截流河道水力特性，指导工程施工，采用峡江站水文资料及枢纽实测水位，在率定好截流时期一维数学模型的基础上，建立了赣江峡江段平面二维水流数学模型，定量计算单戗堤枢纽截流时期重要水域及过流建筑物水流形态，分析流场形态的变化特征和局部流态对枢纽尤其是围堰的影响，并将研究结果与物理模型试验结果做了对比分析，同时分析了双戗堤截流工况对改善龙lZl水利条件的影响程度．结果表明二维数学模型能较准确地计算截流时期围堰工程局部水位及流场变化情况，峡江枢纽大江截流施工方案可行．

英文摘要：

In order to guide the cofferdam construction, hydraulic characteristics of the river channel are simulated and analysed during the closure operation. After the verification of the one-dimensional mathematical model with hydrological data collected from Xiajiang hydrological station and the measured water level during the water control project construction, a two-dimensional numerical model is developed to simulate characteristics of waters around the water control project. The flow patterns around the closure berm are quantitatively calculated, the rariation characteristics of flow field and effects of local flow patterns on the closure berm especially the cofferdam are analyzed, and the research results are compared with the physical model tests. And then the results of the double closure berm are compared to these of the single closure berm. The results indicate that the two-dimensional mathematical model can accurately simulate the local water level and flow field the cofferdam, and that the closure construction scheme of the Xiajiang hydroproject is feasible and suitable.