干支流汇合口平面二维水沙数学模型研究  

The study of the two-dimensional mathematical model of water and sediment in the tributaries confluence

作　　者：林燕宁[1] 喻涛[1] 

机构地区：[1]重庆交通大学河海学院,重庆400074

出　　处：《吉林水利》2011年第9期14-19,共6页Jilin Water Resources

摘　　要：天然河流中存在着大量的干支流交汇的河段,一般交汇河段都具有复杂的水流条件和地形条件,对于交汇处复杂边界条件下所引起的水流运动及河床变形研究造成一定的困难。以长江和沱江汇合口为例,针对汇合口河段复杂的地形和河势,建立了贴体正交曲线坐标下的平面二维水沙数学模型,克服了边界复杂及计算域尺寸悬殊所引起的困难,采用欠松弛技术求解方法避免了截断误差引起的发散。通过对该河段水流泥沙运动进程进行复演,表明该模型能准确模拟该河段水流运动规律,不仅可以用于该河段复杂的冲淤变化模拟和预测,对其他汇合口河段数值模拟亦具有借鉴意义。There are a lot of intersection of the river tributaries in natural rivers, the river generally have acomplex intersection of flow conditions and terrain conditions, it caused the a certain amount of difficult for the study of flow movement and bed deformation under the complex boundary conditions for the interchange. Taking the mouth of Confluence of River Yangtze and River River as an example, for the complex terrain in the confluence of the rivers, it established a two-dimensional mathematical model of water and sediment under a body-fitted orthogonal curvilinear coordinates, which overcome difficulties caused by the complexity and cornputational domain size of the border, and avoided divergence with truncation error solution method of underrelaxation techniques. The repeating process of river flow and sediment movement has shown that the model can accurately simulate the movement law of river water, not only for changing simulation and prediction in the river erosion and deposition, but also has a significant reference for other river confluence numerical simula- tion.

关 键 词：汇合口 长江 沱江 数值模拟 

分 类 号：TV121.7[水利工程—水文学及水资源]