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Generation of overrides and compound tides in Amazon estuary

机译：在亚马逊河口生成覆盖和复合潮

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摘要

Tidal propagation in estuaries is affected by friction and fresh water discharge, besides changes in the depth and morphology of the channel. Main distortions imply variations in the mean water level and asymmetry. Tidal asymmetry can be important as a mechanism for sediment accumulation and turbidity maximum formation in estuaries, while mean water level changes can affect navigation depths. Data from several gauges stations from the Amazon estuary and the adjacent coast were analyzed and a 2DH hydrodynamic model was configured in a domain covering the continental shelf up to the last section of the river where the tidal signature is observed. Based on data, theoretical and numerical results, the various influences in the generation of estua-rine harmonics are presented, including that of fresh water discharge. It is shown that the main overtide, M_4, derived from the most important astronomic component in the Amazon estuary, M_2, is responsible for the tidal wave asymmetry. This harmonic has its maximum amplitude at the mouth, where minimum depths arc found, and then decreases while tide propagates inside the estuary. Also, the numerical results show that the discharge does not affect water level asymmetry; however, the Amazon river discharge plays an important role in the behavior of the horizontal tide. The main compound tide in Amazon estuary, Msf, generated from the combination of the M_2 and S_2, can be strong enough to provoke neap low waters lower than spring ones. The results show this component increasing while going upstream in the estuary, reaching a maximum and then slightly decaying.
机译：除了河道的深度和形态变化外，河口的潮汐传播还受到摩擦和淡水的影响。主要失真意味着平均水位和不对称性的变化。潮汐的不对称性可能是重要的机制，它是河口沉积物堆积和最大浊度形成的一种机制，而平均水位变化会影响航行深度。分析了来自亚马逊河口和邻近海岸的几个水位站的数据，并在覆盖大陆架的区域配置了2DH流体动力学模型，直到观察到潮汐特征的河道的最后一段。基于数据，理论和数值结果，提出了对河口谐波产生的各种影响，包括淡水排放的影响。结果表明，主要潮汐M_4源自亚马逊河口M_2中最重要的天文分量，是造成潮汐不对称的原因。该谐波在口处具有最大振幅，在此处发现了最小深度，然后在潮汐在河口内传播时减小。数值结果还表明，放电不会影响水位的不对称性。然而，亚马逊河的流量在水平潮汐的行为中起着重要的作用。由M_2和S_2的组合产生的亚马逊河口主要复合潮汐Msf可能足以引起比春季低的低潮位。结果表明，该成分在河口上游时增加，达到最大值，然后略有衰减。

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  • 来源
    《Ocean Dynamics》 |2005年第6期|441-448|共8页
  • 作者

    Marcos Nicolas Gallo; Susana Beatriz Vinzon;

  • 作者单位

    Coastal and Oceanographic Engineering Area, Ocean Engineering Program/COPPE, Federal University of Rio de Janeiro, CT C203 Cx Po 68508, 21945-970, Rio de Janeiro, Brasil;

    rnCoastal and Oceanographic Engineering Area, Ocean Engineering Program/COPPE, Federal University of Rio de Janeiro, CT C203 Cx Po 68508, 21945-970, Rio de Janeiro, Brasil;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    tidal propagation; tidal asymmetry; shallow-water harmonics; amazon estuarv;

    机译：潮汐传播潮气不对称浅水谐波;亚马逊河;

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