永定新河入海口滩涂改造工程的防洪影响评价

调查研究了永定新河相关流域、河道资料及工程建设资料，用普里斯曼四点隐式差分法对圣维南方程进行离散求解，建立了洪水演进的水力数学模型。对滩涂改造工程所产生的永定新河壅水进行分析评价，并将其与永定新河的防洪标准相结合，论证结果表明滩涂改造建设项目实施后，沿永定新河所产生的壅水高度是非常小的，对永定新河及其附近区域防洪形势的影响是非常有限的，因此该工程的实施不会影响到永定新河的防洪泄洪。

Flood Prevention Influence Evaluation of New Developed Area in YongDingXin river

This paper investigates the related datums of the river basin and the channel of YongDingXin river, and also the project, introduces the empirical formulas in brief, discusses the using of implicit four-point finite difference scheme proposed by Preissmann to discretize the governing equations, and establishes the numerical model of flood moving . This thesis use the later method to estimate the swelling of YongDingXin river, and combines it with the flood prevention standards, the result of which indicates that after actualizing the project of the alteration of the bottomland, the swelling height cause by which is very small, its effects to YongDingXin river and its neighborhood is very finite, therefore, actualizing of this project will not affect the prevention of YongDingXin river.