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首页> 外文期刊>International journal of river basin management >Practical modelling of tidal propagation under fluvial interaction in the Mekong Delta
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Practical modelling of tidal propagation under fluvial interaction in the Mekong Delta

机译：湄公河三角洲河流相互作用下潮汐传播的实用模拟

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Estuarine/river engineers often encounter a problem that it is hard to specify an upstream boundary of a delta in the numerical modeling because of lack of good quality discharge data. This paper proposes a practical procedure to simulate tidal propagation and damping over a river stretch using a commonly used shallow-water equation model without imposing an upstream discharge boundary. The interaction between tides and river flows could be easily evaluated by applying seasonally-varying Manning's n friction values. The Hau River, one of the main streams of the Mekong River, is studied by analyzing water levels measured at three different locations in the estuary. The nearly straight-line geometry of the Hau River allows us to neglect flood plain sinuosity, making it possible to extract tidal damping induced purely by fluvial influence. A series of analyses, including spectrum analysis and hydrodynamic simulation, suggests that tidal damping in the estuary of the Mekong Delta can be readily reproduced using the numerical model with Manning's n values of 0.025-0.032 [s m"1/3] for the flood season and 0.018-0.025 for the dry season. The present study demonstrates that changes in Manning's n value according to river flow conditions result in more reliable estimations than simply using a constant value throughout the year. The proposed procedure will be of great benefit not only for tidal modeling but also river and urban flood simulations, saline intrusion modeling and sea-level rise projections in the estuary of the Mekong River.
机译：河口/河道工程师经常遇到这样的问题：由于缺乏优质的排放数据，很难在数值模型中指定三角洲的上游边界。本文提出了一种实用的程序，可使用常用的浅水方程模型模拟河流沿线的潮汐传播和衰减，而无需施加上游排放边界。通过应用随季节变化的曼宁n摩擦值，可以轻松地评估潮汐与河流流量之间的相互作用。通过分析河口三个不同地点的水位来研究湄公河主要河流之一的后河。 Hau河的近似直线几何形状使我们可以忽略洪泛平原的弯曲度，从而有可能提取出单纯由河流影响引起的潮汐阻尼。包括频谱分析和流体动力学模拟在内的一系列分析表明，使用洪水期间曼宁n值为0.025-0.032 [sm“ 1/3]的数值模型，可以很容易地再现湄公河三角洲河口的潮汐阻尼。本研究表明，根据河流流量情况，曼宁n值的变化比一年中仅使用一个恒定值更可靠，因此，所建议的程序不仅将对潮汐模型，以及湄公河河口的河流和城市洪水模拟，盐分入侵模型以及海平面上升预测。

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