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Hydrodynamic response of the Breton Sound estuary to pulsed Mississippi River inputs

机译：布列塔尼河河口对密西西比河脉冲输入的水动力响应

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摘要

Pulsed re-introduction of Mississippi River water into the deltaic plain has been proposed as a wetland restoration strategy for coastal Louisiana. In this study, the hydrodynamic response of the Breton Sound estuary to a two-week pulse of Mississippi River water via the Caernarvon river diversion structure was investigated using a barotropic, three-dimensional, Finite-Volume Coastal Ocean Model (FVCOM). The numerical model was driven by tidal and subtidal forcing at the open Gulf boundary, freshwater discharge from the Caernarvon river diversion structure, as well as wind stress at the water surface. After successfully validating the model with field observations, three numerical experiments were run to assess the response of current, water level, and marsh flooding to different diversion discharge scenarios. The three scenarios considered were: a pulsed scenario of ~200 m~3 s~(-1) corresponding to the actual diversion discharge in March 2001, a constant discharge scenario of 40 m~3 s~(-1) corresponding to the annually averaged discharge of 2001, and a scenario with no discharge. Numerical simulation results indicated that constant 40 m~3 s~(-1) discharge caused little change in wetland inundation comparing to the no discharge case and, thus, inter-exchange between deep channels and the wetlands was not improved by this rate of diversion discharge. In contrast, the two-week ～200 m~3 s~(-1) discharge caused enhanced water exchange between wetlands and adjacent water bodies, substantially increasing water velocity in the bayous and channels of the upper estuary. These effects occurred in the estuary to about 20-25 km from the diversion structure, and caused a noticeable increase in down-estuary residual current with a significant reduction of local estuarine residence times for the whole estuary. Beyond 30 km from the diversion structure, the impact of high water discharge was small and the hydrodynamics was mostly controlled by tides and wind.
机译：已经提出将脉冲状的密西西比河水重新引入三角洲平原作为路易斯安那州沿海地区的湿地恢复策略。在这项研究中，使用正压三维有限体积沿海海洋模型（FVCOM），研究了布雷顿河河口对经由Caernarvon河改道结构的密西西比河河水两周脉冲的水动力响应。该数值模型是由海湾开放边界处的潮汐和潮汐强迫，卡那封河引水结构的淡水排放以及水面的风应力驱动的。在通过现场观察成功验证该模型后，进行了三个数值实验，以评估水流，水位和沼泽洪水对不同引水排放情景的响应。所考虑的三种情况是：对应于2001年3月实际分流流量的〜200 m〜3 s〜（-1）的脉冲场景，对应于每年的40 m〜3 s〜（-1）的恒定流量的场景。 2001年的平均排放量，以及无排放的情况。数值模拟结果表明，与不排水相比，恒定的40 m〜3 s〜（-1）流量引起的湿地淹没变化很小，因此，这种分流速率并不能改善深水通道与湿地之间的相互交换。排出。相比之下，两周〜200 m〜3 s〜（-1）的排放导致湿地与邻近水体之间的水交换增强，大大增加了上河口的海湾和河道中的水流速度。这些影响发生在河口，距分流结构约20-25 km，并导致河口下游剩余电流显着增加，整个河口的本地河口停留时间显着减少。在距引水结构30公里以外的地方，高排水量的影响很小，水动力主要受潮汐和风的控制。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2011年第1期|p.216-231|共16页
  • 作者

    Haosheng Huang; Dubravko Justic; Robert R. Lane; John W. Day; Jaye E. Cable;

  • 作者单位

    Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, 320 Howe-Russell Ceosdence Complex, Baton Rouge, LA 70810, United States;

    Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, 320 Howe-Russell Ceosdence Complex, Baton Rouge, LA 70810, United States;

    Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, 320 Howe-Russell Ceosdence Complex, Baton Rouge, LA 70810, United States;

    Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, 320 Howe-Russell Ceosdence Complex, Baton Rouge, LA 70810, United States;

    Department of Oceanography and Coastal Sciences, School of the Coast and Environment, Louisiana State University, 320 Howe-Russell Ceosdence Complex, Baton Rouge, LA 70810, United States;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    river diversion; wetlands; hydrodynamics; water currents; residence time; USA, louisiana, breton sound estuary;

    机译：引水湿地流体力学水流停留时间;美国;路易斯安那州;布列塔尼河口;

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