Observations of oceanic-forced subtidal elevations in a convergent estuary

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• 作者：Jamie MacMahan ^{jhmacmah@nps.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Subtidal ; Coastal downwelling ; Columbia river ; Tide ; River ; Estuary
• 刊名：Estuarine, Coastal and Shelf Science
• 出版年：2016
• 出版时间：5 November 2016
• 年：2016
• 卷：181
• 期：Complete
• 页码：319-324
• 全文大小：1340 K

文摘

Remotely-forced downwelling events are found to generate oceanic subtidal elevations along the Pacific Northwest that are transmitted upstream in a large, river-tide, convergent Columbia River estuary (CRE). The oceanic subtidal generation mechanism was evaluated using NOAA tidal and USGS river gage station data along the northern California, Oregon, and Washington estuaries and throughout the Columbia River and the NOAA Coastal Upwelling Index. Oceanic downwelling-induced subtidal motions propagate upstream with a slight decrease in amplitude. River discharge pulses also generate subtidal motions that propagate downstream with decreasing amplitude. The relative oceanic subtidal motions represent 90% of the total subtidal contribution near the entrance that decrease to 40% at 169 km upstream.