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三峡大坝施工过程中,土石围堰及其它水工建筑物将改变原有河道水流结构分布,水动力条件的改变是工程较为关注的问题之一。本文通过曲线网格拟合天然河道边界建立二维数值计算模型,模型经实测资料验证后预测了施工期在典型流量条件下流场的改变,为工程有关实际问题的决策提供了依据。
During the construction of the Three Gorges Dam, the earth-rock cofferdam and other hydraulic structures will change the distribution of the original river flow structure. The change of hydrodynamic conditions is one of the more concerned issues in the project. In this paper, a two-dimensional numerical model is established by fitting curve boundaries to natural river boundaries. The model is verified by measured data to predict the change of flow field under typical flow conditions during the construction period, which provides the basis for engineering decision-making on practical problems.