三峡两坝间水田角河段航道整治三维水流数学模型应用研究

水田角河段水流湍急,流态紊乱,船舶航行较困难,是三峡两坝间河段急需整治的重点河段之一。基于平面正交坐标和立面σ坐标拟合河道平面形态、地形和自由水面的不规则分布,建立了三维紊流数学模型。采用物理模型实测的三维流速分布对模型进行验证,模拟的流速值与实测值吻合良好,将模型应用于水田角河段航道整治工程实施前、后的三维流场计算,给出了水田角河段的分层和断面二次流流速分布。分析结果表明,炸礁、抛填等整治措施的综合利用能有效调整河段流速分布,是有效的整治方案,可供设计参考。

Three-dimensional flow mathematical model for channel regulation of the Shuitianjiao reach between the Three Gorges Dam and Gezhou Dam

The flow is rapid and flow pattern is out of order in the Shuitianjiao reach.So it is difficult for shipping and urgently need to be regulated.The three-dimensional mathematical model was proposed,which based on the orthogonal and σ grid systems in horizontal and vertical direction respectively to fit the irregular distribution of channel plane,bed topography and water surface.It was well validated by measured data from the physical model.Then it was used to simulate the flow characteristics without and with the channel regulation.The simulated results show that it is effective about reef blasting and dumped fill which may get good flow pattern.The analyzed results will have a good preference for designing of channel regulation in the Shuitianjiao reach.