Summertime tidal flushing of Barataria Bay: Transports of water and suspended sediments
Summertime tidal flushing of Barataria Bay: Transports of water and suspended sediments
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DOI：
10.1029/2010jc006566
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发表时间：
2011-04-13
影响因子：
3.6
通讯作者：
Bargu, Sibel
中科院分区：
文献类型：
--
作者：
Li, Chunyan;White, John R.;Bargu, Sibel
入海口在限制性海湾和河口与沿海海洋之间提供了重要的生态联系。本研究提出了水沙净通量。这些通量的基础上获得的数据，从一个多学科的，完整的潮汐周期调查巴拉塔里亚通行证在路易斯安那州南部的7月31日至2008年8月1日。流速剖面的声学多普勒流速剖面仪安装在一艘小船上，不断穿过入口，其中包含快速和湍流的潮流。在24小时内，在三个离散的深度和三个位置的入口处收集了六次水样。观测描绘了一个明显的漩涡西侧的入口，导致低的R-2值的潮汐调和分析的边缘的入口。总悬浮泥沙的净通量的海湾被确定为8800吨，其中20%是有机物，表现出显着的有机物来源的沿海海洋碎屑食物链的基础。水和悬浮物的时间演变和净通量表明，净流量类似于常规河口环流模式，入口表面和浅端为净流出，中心和底部为净流入。入口中心。西侧的外向流量比东侧大得多，而东侧则更新鲜。这些差异表明，来自鸟足三角洲周围的路易斯安那沿岸流来自陆架水与密西西比河淡水的混合，可能已经进入海湾。在调查期间，这一定主要来自东侧，这导致东侧的外流较小。数值实验进一步证实了这一假设，并于2010年5月5日通过实地观测验证了该模型。
Inlets provide a critical ecological link between restricted bays and estuaries to the coastal ocean. The net fluxes of water and suspended sediment are presented in this study. These fluxes are obtained based on data from a multidisciplinary, full tidal cycle survey across Barataria Pass in southern Louisiana on 31 July to 1 August 2008. The velocity profiles were obtained with an acoustic Doppler current profiler mounted on a small boat continuously crossing the inlet, which contains swift and turbulent tidal currents. Water samples were collected six times in a 24 h period at three discrete depths and three locations across the inlet. The observations delineated a clear eddy on the western side of the inlet which causes a low R-2 value of the tidal harmonic analysis on the edges of the inlet. The net flux of total suspended sediment out of the bay was determined to be 8800 t of which 20% was organic matter, demonstrating a significant source of organic matter to the base of the coastal ocean detrital food chain. The time evolution and net fluxes of water, and suspended sediments showed that the net flow resembles conventional estuarine circulation patterns with net outward flow on the surface and shallow ends of the inlet and with net inward flow in the center and at the bottom of the center of the inlet. The west side has a much larger outward flow than the east side while the east side is fresher. These differences suggest that the Louisiana Coastal Current from around the Bird's Foot Delta derived from the mixing of shelf water with the Mississippi River freshwater may have entered the bay. This must have been mostly from the east side during the survey, which resulted in a smaller outward flow on the eastern side. A numerical experiment further confirmed this assumption and the model was verified by field observations on 5 May 2010.