中文摘要：

为优化峡江水利枢纽大江截流施工方案,通过赣江峡江段平面二维水流数学模型对截流施工比选方案进行了数值模拟.采用峡江站水文资料及枢纽实测水位对模型进行率定,定量计算了两种不同截流施工方案坝址水域及过流建筑物水流形态,并分析了流场形态的变化特征和局部流态对枢纽尤其是龙口的影响程度.数值模拟结果显示,采用直线进占时,泄水流态差,围堰上游水位较高;折线进占虽流线流畅,上游主河道流速增大,但龙口泄流能力较差.研究结果为实际截流施工提供了论证和指导.

英文摘要：

In order to optimize the closure construction scheme of Xiajiang hydro -junction on Ganjiang River, a 2D flow mathematical model was established and calibrated by hydrological data at Xiajiang station and water level at the dam site, then, flow patterns around the diversion structures for two closure construction schemes were analyzed quantitatively, also the variation characteristics of flow field and influence of local flow state at closure gap were studied. The study results show that the discharge flow pattern is adverse and water level of upstream cofferdam is higher for the closure scheme of linear advancing; meanwhile, for the closure scheme of fold - line advancing, the flow pattern is smoother with higher flow velocity in upstream main channel, how- ever the discharge capacity is worse.