摘要
在河口水流、泥沙数值计算时提出一、二维衔接的数学模型。根据一、二维水流连续方程、运动方程、悬沙扩散方程、两相流底沙运动方程、床面演变方程,对一维河道采用河网三级联解法、迎风差分格式,对二维海区采用有限元加权集中质量法、三角差分格式,建立水沙河口衔接数学模型。将此模型应用于天津泰达永定新河河口工程的研究上,经实测水沙资料验证,计算值与实测值基本吻合。为河口改造时引起的河道与海区的水流及泥沙稳定性问题提供了可行的研究方法。
A 1 - D and 2 - D combined numerical model is put forward during the numerical calculation of flow and sediment at an esturary. In accordance with the 1 - D and 2 - D dimensional flow continuity equation, the motion equation, the diffusion e- quation for the suspended sediment, the bed load movement equation for the two-phase flow and the equation for river bed evolution, the three-steps-solving method for river network and the upwind difference scheme are applied to the 1 - D river channel; while the FEM weighted lump-mass method and the triangle difference scheme are applied to the 2 - D coastal area. On the basis of this, a combined numerical model for the flow and sediment carrying estuary is established. During the application of this model to the study on the estuary project of Yongdingxinhe River in Tianjin, the calculated values coincides with the measured ones through the verification based on the measured data of both the flow and the sediment; which provides a feasible method for the study on the problems from the stabilities of the flow and the sediment in the river and the coastal area during the estuary improvement concerned.
出处
《水利水电技术》
CSCD
北大核心
2011年第1期32-36,共5页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(50679053)
关键词
河口一
、二维衔接模式
泥沙数学模型
两相流底沙运动
1 - D and 2 - D combined numerical model for estuary
sediment numerical model
two-phase flow bed load movement
