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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Responses of estuarine circulation and salinity to the loss of intertidal flats - A modeling study
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Responses of estuarine circulation and salinity to the loss of intertidal flats - A modeling study

机译：河口循环和盐度对潮间带损失的响应-模型研究

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Intertidal flats in estuaries are coastal wetlands that provide critical marine habitats to support wide ranges of marine species. Over the last century many estuarine systems have experienced significant loss of intertidal flats due to anthropogenic impacts. This paper presents a modeling study conducted to investigate the responses of estuarine hydrodynamics to the loss of intertidal flats in Whidbey Basin of Puget Sound on the northwest coast of North America. Changes in salinity intrusion limits in the estuaries, salinity stratification, and circulation in intertidal flats and estuaries were evaluated by comparing model results under the existing baseline condition and the no-flat condition. Model results showed that loss of intertidal flats results in an increase in salinity intrusion, stronger mixing, and a phase shift in salinity and velocity fields in the bay front areas. Model results also indicated that loss of intertidal flats enhances two-layer circulation, especially the bottom water intrusion. Loss of intertidal flats increases the mean salinity but reduces the salinity range in the subtidal flats over a tidal cycle because of increased mixing. Salinity intrusion limits extend upstream in all three major rivers discharging into Whidbey Basin when no intertidal flats are present. Changes in salinity intrusion and estuarine circulation patterns due to loss of intertidal flats affect the nearshore habitat and water quality in estuaries and potentially increase risk of coastal hazards, such as storm surge and coastal flooding. Lastly, model results suggested the importance of including intertidal flats and the wetting-and-drying process in hydrodynamic simulations when intertidal flats are present in the model domain. (C) 2015 Elsevier Ltd. All rights reserved.
机译：河口的潮间带是沿海湿地，它们提供了重要的海洋栖息地，以支持各种海洋生物。在上个世纪，许多河口系统由于人为因素而遭受潮间带大面积损失。本文提出了一项建模研究，以研究北美西北海岸普吉特海湾惠德比盆地河口水动力对潮间带损失的响应。通过比较现有基线条件和不平坦条件下的模型结果，评估河口盐分侵入极限，盐度分层以及潮间带和河口环流的变化。模型结果表明，潮间带的损失导致盐度侵入增加，混合更强，以及海湾前缘盐度和速度场发生相移。模型结果还表明，潮间带滩涂的丧失增强了两层环流，尤其是底部水侵入。潮间带的损失增加了平均盐度，但由于混合增加，潮汐带下潮间带的盐度范围减小了。在没有潮间带滩涂的情况下，盐度侵入极限在所有排入惠德比盆地的三大主要河流的上游。潮间带损失造成的盐度入侵和河口环流模式的变化会影响河口的近岸生境和水质，并可能增加诸如风暴潮和沿海洪水之类的沿海灾害的风险。最后，模型结果表明，当模型域中存在潮间带时，在水动力模拟中包括潮间带以及湿润和干燥过程的重要性。 （C）2015 Elsevier Ltd.保留所有权利。

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