防潮闸启闭影响下的河口水流泥沙运动状态研究

Research on flow and sediment movement in estuary under the effect of tidal gate

为研究防潮闸启闭与跨水工程建设对河口地区水流泥沙运动状态的影响,以河口近闸跨水工程为背景,建立了以Godunov格式有限体积法为基础的二维浅水流动数学模型和基于固液二相流理论的二维水流泥沙数学模型,并以实测资料进行必要验证,结果较为吻合。在此基础上,建立了永定新河河口区域二维水沙数值模型,将该模型应用于滨海新区Z4线一期跨河工程段的水沙分析,并对工程建设后永定新河河口水流泥沙运动的变化趋势进行预报。结果表明永定新河河口二维全沙模型较为可靠,可为河口近闸跨水工程的相关分析提供研究思路和方法。

In order to study the influence of the opening and closing of the tidal gate and the construction of the water crossing project on the flow and sediment movement in the estuary, taking the near gate and water crossing project in the estuary as the case, a two-dimensional shallow water flow mathematical model based on Godunov scheme finite volume method and a two-dimensional flow sediment mathematical model based on solid-liquid two-phase flow theory are established. The necessary verification is carried out with the in-situ observations, and the results are in good agreement. On this basis, a two-dimensional numerical model of water-sediment in Yongding New River estuary area is established, which is applied to the water-sediment analysis of the first phase of the Z4 cross-river project in Binhai New Area, and the change trend of the water-sediment movement in the Yongding New River estuary is forecasted after the construction of the project.The results show that the two-dimensional total sediment model of Yongding New River estuary is more reliable, and can provide research ideas and methods for the relevant analysis of the near-gate cross-water project in the estuary.