A numerical investigation of salinity variations in the Barataria Estuary, Louisiana in connection with the Mississippi River and restoration activities
A numerical investigation of salinity variations in the Barataria Estuary, Louisiana in connection with the Mississippi River and restoration activities
复制标题
对路易斯安那州巴拉塔里亚河口与密西西比河和恢复活动相关的盐度变化进行数值调查
DOI：
10.1016/j.ecss.2020.107021
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Zang, Zhengchen
中科院分区：
文献类型：
--
作者：
Ou, Yanda;Xue, Z. George;Li, Chunyan;Xu, Kehui;White, John R.;Bentley, Samuel J.;Zang, Zhengchen
将三维数值模型应用于墨西哥湾北部的巴拉塔里亚河口，研究其盐度变化以及密西西比河排放和拟议河流改道的影响。模型与观测的比较表明，该模型能够在潮下到季节时间尺度上再现水动力场。巴拉塔里亚河口盐度秋季高、夏季低，下河口的盐度变化大于上河口。虽然河口上游的盐度受到当地淡水改道排放的控制，但河口下游的盐度主要受到通过南部潮汐入口输送的密西西比河混合水的影响。密西西比河流量与河口盐度的相关性表明，低盐度的密西西比河水可以通过中部和东部入潮口侵入河口。进行了敏感性测试，以评估密西西比河排放和拟议的巴拉塔里亚河口中部沉积物转移的影响。模型结果表明，河口盐度对密西西比河流量的增加比减少更敏感。拟议的巴拉塔里亚中部沉积物转移可能会导致下游河口盐度急剧下降。密西西比河流量波动以及拟议的河流改道对生态系统的影响需要进一步调查。
A three-dimensional numerical model was applied to the Barataria Estuary in the Northern Gulf of Mexico to study its salinity variations as well as the impacts from the Mississippi River discharges and proposed river diversions. Model-observation comparison showed that the model was able to reproduce the hydrodynamic fields on subtidal to seasonal time scales. Salinity in the Barataria Estuary was high in fall and low in summer, with a greater variability in the lower estuary than the upper estuary. While salinity in the upper estuary was controlled by discharges from a local freshwater diversion, salinity in the lower estuary was mostly affected by the mixed Mississippi River water transported via the tidal inlets in the south. The correlation between Mississippi River discharge and estuarine salinity indicated that low salinity Mississippi River water could intrude into the estuary through the middle and east tidal inlets. Sensitivity tests were performed to assess the impacts from the Mississippi River discharges and proposed mid-Barataria Estuary sediment diversion. Model results illustrated that salinity in the estuary was more sensitive to an increase of Mississippi River discharge than a decrease. The proposed mid-Barataria sediment diversion was likely to induce a dramatic decrease of salinity in the lower estuary. The ecosystem consequences of the fluctuation of Mississippi River discharge as well as that of the proposed river diversions need further investigations.
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影响因子：
3.2
作者：
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DOI：
10.3133/wri874173
发表时间：
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期刊：
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影响因子：
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作者：
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作者：
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影响因子：
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作者：
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DOI：
--
发表时间：
1990
期刊：
影响因子：
--
作者：
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