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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seabed erodibility variations on the Louisiana continental shelf before and after the 2011 Mississippi River flood
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Seabed erodibility variations on the Louisiana continental shelf before and after the 2011 Mississippi River flood

机译：2011年密西西比河洪水前后路易斯安那州陆架的海床侵蚀性变化

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摘要

Erodibility is critical to the sediment resuspension process but has not been measured systematically in large river-dominated muddy continental shelves before. During early summer of 2011, the Mississippi River experienced a major flood event. This flood provided a unique opportunity to examine how shelf seabed erodibility responded to a large river flood, and the ultimate fate of flood deposition is important to geological and biogeochemical processes (e.g., stratal formation, carbon sequestration). A total of 106 sediment cores were collected on the Louisiana shelf during five cruises in 2010 and 2011, and a new dataset was used to evaluate the response of the seabed to the recent conditions. The localized flood deposit was mainly within tens of kilometers of river sources, and little sediment accumulated on the middle Louisiana shelf. Seabed erodibility was measured using a dual-core Gust Erosion Microcosm System. The erodibility of sediment collected in April 2011 exceeded that for August 2010 and August 2011. The springtime increase in erodibility seemed to be related to the recent presence of energetic waves that mobilized the seabed. Erodibility was highest on the inner shelf southwest of Atch-afalaya Bay, intermediate on the middle shelf, lowest in the Mississippi Canyon, and highly variable on the Mississippi subaqueous delta. These spatial patterns were influenced by proximity to river sources, flood-deposit thicknesses, intensity of wave-driven bed stresses, and bioturbation. The flood-deposit thickness itself, however, was not sufficient to explain all the spatial variations of erodibility after the peak of the Mississippi flood. Comparing values to published data, the depth-varying erodibility on the Louisiana shelf was close to the "low erodibility" level for the York River of Virginia, and similar to the data collected from Baltimore Harbor in Maryland and the main stem of upper Chesapeake Bay. Our findings promote understanding of the resuspension of fluffy organic-rich layer at the water-sediment interface, which influences sediment oxygen demand on the Louisiana shelf. This dataset is also valuable to observational and modeling studies of large river sediment dispersal systems worldwide.
机译：可蚀性对于沉积物的再悬浮过程至关重要，但以前尚未在大型河流为主的泥泞大陆架上进行过系统的测量。在2011初夏，密西西比河经历了一次重大洪水事件。这次洪水提供了一个独特的机会来研究陆架海床易蚀性如何应对大河洪水，洪水沉积的最终命运对于地质和生物地球化学过程（例如地层形成，碳固存）至关重要。在2010年和2011年的五次航行中，路易斯安那架子上总共收集了106个沉积物岩心，并使用一个新的数据集评估了海床对近期条件的响应。局部洪灾沉积物主要位于数十公里的河源内，路易斯安那州中部陆架上几乎没有沉积物。使用双核Gust Erosion Microcosm系统测量海床的侵蚀性。 2011年4月收集的沉积物的可蚀性超过了2010年8月和2011年8月的可蚀性。春季可蚀性的增加似乎与最近动员海床的高能波有关。可蚀性在Atch-afalaya湾西南的内陆架上最高，在中陆架上中等，在密西西比峡谷中最低，在密西西比水下三角洲上变化很大。这些空间格局受邻近河源，洪水沉积厚度，波浪驱动床应力强度和生物扰动的影响。然而，洪水沉积厚度本身不足以解释密西西比河洪峰之后侵蚀性的所有空间变化。将值与已发布的数据进行比较，路易斯安那架子上的深度可蚀性接近于弗吉尼亚约克河的“低可蚀性”水平，与从马里兰州巴尔的摩港和切萨皮克湾上游主干收集的数据相似。我们的发现促进了人们对水-沉积物界面上蓬松的富含有机物的层的重新悬浮的了解，这会影响路易斯安那架子上的沉积物需氧量。该数据集对于全球大型河流沉积物扩散系统的观测和建模研究也很有价值。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第5期|283-293|共11页
  • 作者

    K. Xu; D.R. Corbett; J.P. Walsh; D. Young; K.B. Briggs; G.M. Cartwright; C.T. Friedrichs; C.K. Harris; R.C. Mickey; S. Mitra;

  • 作者单位

    Department of Oceanography and Coastal Sciences, Louisiana State University, 2165 Energy, Coast and Environment Building, Baton Rouge, LA 70803, USA,Coastal Studies Institute, Louisiana State University, Baton Rouge, LA 70803, USA;

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, USA;

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, USA;

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, USA;

    Marine Geosciences Division, Naval Research Laboratory, Stennis Space Center, MS 39529, USA;

    Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, VA 23062, USA;

    Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, VA 23062, USA;

    Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, VA 23062, USA;

    College of Science, Coastal Carolina University, Myrtle Beach, SC 29528, USA;

    Department of Geological Sciences, East Carolina University, Greenville, NC 27858, USA;

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  • 正文语种 eng
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  • 关键词

    erodibility; sediment transport; Gulf of Mexico; Louisiana shelf; Mississippi River flood;

    机译：可蚀性泥沙输送;墨西哥湾;路易斯安那架子;密西西比河洪水;

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