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首页> 外文期刊>Journal of offshore mechanics and arctic engineering >A Flow-Sediment Numerical Model Using One and Two Dimensions for the Yongding New Estuary
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A Flow-Sediment Numerical Model Using One and Two Dimensions for the Yongding New Estuary

机译：永定新河口一维二维水沙数值模型

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摘要

This paper derived the continuity and momentum equations of solid-liquid two-phase flows using infinitesimal body analysis and obtained well-posed equations of two-dimensional (2D) flow-sediment movement. Based on the theory of solid-liquid two-phase flow, the momentum equations of the bedload sediment were deduced and a closed form of the 2D total sediment model equations was established. Then, the exchange mechanism of suspended sediment and bedload sediment and their computational method were elaborated on in great detail. Combined with the basic theory of one-dimensional (1D) flow-sediment movement, a flow-sediment numerical model of one and two dimensions was established for the region of Yongding New Estuary. A series of model verifications were carried out, which showed that the model can be adopted to simulate the flow-sediment movement in this region. This model was then applied for the environmental assessment of Taida Sea Reclamation Project. The conclusions indicate that the backwater effects of the proposed construction scheme would be fairly small and that the deposition amount in the river would be greatly reduced owing to the source of alongshore sediment transport being blocked by the project. This study provides a scientific model and method for the feasibility study and environmental assessments of construction projects.
机译：本文利用无穷小体分析推导了固液两相流的连续性和动量方程，并获得了二维（2D）沉积物运动的良好方程组。基于固液两相流理论，推导了床荷沉积物动量方程，建立了二维全沉积物模型方程的闭合形式。然后，详细阐述了悬浮泥沙与基床泥沙的交换机理及其计算方法。结合一维（1D）水沙运动的基本理论，建立了永定新河口区域一维和二维的水沙数值模型。进行了一系列的模型验证，表明可以采用该模型来模拟该区域的流-沙运动。该模型随后被用于台达海垦项目的环境评估。结论表明，由于沿岸沉积物运输的源头被该项目阻塞，拟议的施工方案的回水影响将相当小，河流中的沉积量将大大减少。该研究为建设项目的可行性研究和环境评价提供了科学的模型和方法。

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