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首页> 外文期刊>Estuaries and coasts >A Modeling Study of the Impacts of Mississippi River Diversion and Sea-Level Rise on Water Quality of a Deltaic Estuary
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A Modeling Study of the Impacts of Mississippi River Diversion and Sea-Level Rise on Water Quality of a Deltaic Estuary

机译：密西西比河转移和海平面上升对红细胞水质影响的建模研究

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Freshwater and sediment management in estuaries affects water quality, particularly in deltaic estuaries. Furthermore, climate change-induced sea-level rise (SLR) and land subsidence also affect estuarine water quality by changing salinity, circulation, stratification, sedimentation, erosion, residence time, and other physical and ecological processes. However, little is known about how the magnitudes and spatial and temporal patterns in estuarine water quality variables will change in response to freshwater and sediment management in the context of future SLR. In this study, we applied the Delft3D model that couples hydrodynamics and water quality processes to examine the spatial and temporal variations of salinity, total suspended solids, and chlorophyll-alpha concentration in response to small (142 m(3) s(-1)) and large (7080 m(3) s(-1)) Mississippi River (MR) diversions under low (0.38 m) and high (1.44 m) relative SLR (RSLR = eustatic SLR + subsidence) scenarios in the Breton Sound Estuary, Louisiana, USA. The hydrodynamics and water quality model were calibrated and validated via field observations at multiple stations across the estuary. Model results indicate that the large MR diversion would significantly affect the magnitude and spatial and temporal patterns of the studied water quality variables across the entire estuary, whereas the small diversion tends to influence water quality only in small areas near the diversion. RSLR would also play a significant role on the spatial heterogeneity in estuary water quality by acting as an opposite force to river diversions; however, RSLR plays a greater role than the small-scale diversion on the magnitude and spatial pattern of the water quality parameters in this deltaic estuary.
机译：河口淡水和沉积物管理影响水质，特别是在红外河口。此外，气候变化诱导的海平面上升（SLR）和土地沉降也通过改变盐度，循环，分层，沉降，腐蚀，停留时间和其他物理和生态过程来影响河水水质。然而，关于如何在未来SLR的背景下响应淡水和沉积物管理的次数和河豚水质变量中的次要和空间和时间模式知之甚少。在这项研究中，我们应用了Delft3D模型，以耦合流体动力学和水质过程，检查盐度，总悬浮固体和叶绿素-α浓度的空间和时间变化，响应于小（142米（3）S（-1） ）和大（7080米（3）S（-1））密西西比河（MR）降低（0.38米）和高（1.44米）的相对SLR（RSLR = EUSTATIC SLR +沉降）情景，路易斯安那州，美国。通过在河口的多个站点的现场观察校准流体动力学和水质模型。模型结果表明，大的MR转移会显着影响整个河口的研究水质变量的幅度和空间和时间模式，而小转移往往会影响水质，只能在转移附近的小区域中影响水质。 RSLR也将在河流分流的相反力量方面对河口水质的空间异质性作出重要作用;然而，RSLR比在这种尖端河口中水质参数的幅度和空间模式上的小规模转移起了更大的作用。

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