• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Propagation of subtidal sea level oscillations in the river channel: A case study of the St. Johns River, Florida, USA
【24h】

Propagation of subtidal sea level oscillations in the river channel: A case study of the St. Johns River, Florida, USA

机译：河道中潮间带海平面振荡的传播：以美国佛罗里达州圣约翰斯河为例

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Analysis of water level and river discharge time series collected at three locations in the St. Johns River, FL reveals that subtidal variability with periods of several days is associated with long waves propagating from the ocean into the river channel. These dynamics are similar to tidal wave propagation: both tidal and subtidal frequency bands have the same ratio of free surface-to-discharge standard deviations, which is not the case on oceanic shelves. However, important differences also. emerge: as waves pass through the river mouth, tidal oscillations exhibit much stronger attenuation, while subtidal oscillations propagate at a lower speed. Further upstream, where the channel cross-sectional area contracts (between Palatka and Buffalo Bluff), the waves in two frequency bands adjust differently: tidal waves are amplified and continue upstream, while a significant fraction of subtidal energy is reflected. The amplification of tidal waves occurs mostly through the generation of overtides. Also, tidal wave attenuation in the river relative to the mouth is nearly constant over the observation period, while the attenuation of subtidal waves exhibits strong changes. Variations in subtidal attenuation are linked to the influence of the river discharge: higher discharge (relative to the subtidal water level variability) causes stronger attenuation of subtidal waves. (C) 2015 Elsevier Ltd. All rights reserved.
机译：对佛罗里达州圣约翰斯河三个地点收集的水位和河水排放时间序列的分析表明，潮汐变化的持续时间为几天，这与从海洋向河道传播的长波有关。这些动力学与潮汐波传播相似：潮汐波带和潮汐带下的自由表面排放标准偏差比率相同，而在海洋架上则并非如此。但是，重要的区别也是如此。出现：当波浪通过河口时，潮汐振荡表现出更强的衰减，而潮汐振荡则以较低的速度传播。在更上游的地方，通道的横截面收缩（在Palatka和Buffalo Bluff之间），两个频带中的波调整不同：潮汐波被放大并继续向上游传播，而大部分的潮下能量被反射。潮汐波的放大主要通过潮汐的产生而发生。此外，在观察期内，河水相对于河口的衰减几乎是恒定的，而潮下波的衰减表现出很强的变化。潮汐衰减的变化与河流流量的影响有关：较高的流量（相对于潮汐水位变化）导致潮汐波衰减更大。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号