Numerical modeling of tidal propagation and frequency responses in the Guadalquivir estuary (SW, Iberian Peninsula)

IF 2.1 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research Pub Date : 2024-07-03 DOI:10.1016/j.csr.2024.105275

P. Muñoz-Lopez , I. Nadal , J. García-Lafuente , S. Sammartino , A. Bejarano

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Abstract

A three-dimensional numerical model, based on Delft3D code, has been implemented and calibrated in the mesotidal Guadalquivir Estuary (Spain), a tidally-driven estuary due to the reduced freshwater discharges (25 m³s^-1 year-round average), which are subject to human regulation at the dam located at its head. The model has been applied to study in detail some estuarine features for low freshwater discharges: the first one is the non-linear interaction of semidiurnal constituents, which results in a tidal amplification factor (ratio of local amplitude to the amplitude at the mouth) that depends on the spring-neap tidal cycle, with markedly larger values during neap tides. The second one is the analysis of tidal resonance in the estuary, extending previous studies on the topic, which shows that resonance occurs at near-diurnal frequencies. The peak of resonance decreases in magnitude and shifts towards lower frequencies as friction increases, either by increasing the friction coefficient itself or the amplitude of the tide.

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瓜达尔基维尔河口（伊比利亚半岛西南部）潮汐传播和频率响应的数值模拟

基于 Delft3D 代码的三维数值模型已在介潮汐瓜达尔基维尔河口（西班牙）实施并校准，由于淡水排放量减少（常年平均 25 立方米/秒），该河口受潮汐驱动，位于河口的大坝对其进行人为调节。应用该模型详细研究了淡水排放量较低时的一些河口特征：首先是半日成分的非线性相互作用，这导致潮汐放大系数（当地振幅与河口振幅之比）取决于春-夏潮汐周期，潮汐放大系数在夏潮期间明显增大。其次是对河口潮汐共振的分析，扩展了之前的相关研究，结果表明共振发生在近日频率。随着摩擦力的增大，共振峰值的幅度会减小，并向低频移动，这可能是摩擦系数本身增大或潮汐振幅增大所致。

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.