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首页> 外文期刊>Estuarine Coastal and Shelf Science >Contribution of aeolian sand to backbarrier marsh sedimentation
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Contribution of aeolian sand to backbarrier marsh sedimentation

机译：风沙对后屏障沼泽沉积的贡献

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摘要

The frequency of island overwash is commonly assumed to be the main factor regulating sand flux to backbarrier marshes; however, aeolian transport of sand across a barrier has received little attention in saltmarsh research. The contribution of aeolian sand to backbarrier marshes is examined here with marsh cores and measurements of wind-blown sediment transport across transgressive and regressive parts of a barrier island. Backbarrier marshes fronted by a wide washover fan or a high-elevation dune ridge were supplied with aeolian sand that significantly contributed to vertical accretion, especially near the marsh - barrier island edge. The percent volume of the marsh originating from aeolian sand, based on the upper 1 cm of marsh sediment, decreased by an order of magnitude only ～ 20 m from the dune -marsh boundary. Sandy beds sampled in every marsh core at depth are composed of aeolian sand and were likely emplaced over time after storms deposited a sandy washover fan near the marsh and/or reduced vegetation cover across the island. Sand beds preserved within backbarrier marsh deposits are commonly thought to have been emplaced rapidly during a storm; however, post-storm aeolian transport should also be considered as an important mechanism for forming sand beds over a longer period of time within saltmarsh strata. The contribution of aeolian sand to backbarrier marsh accretion should increase as sea level continues to rise causing many barrier islands to narrow thereby reducing transport distances between the dune and marsh. Along developed coastlines, however, anthropogenic factors associated with increased development largely decrease the connectivity between the dunes and backbarrier marsh.
机译：通常认为，岛状溢流的频率是调节沙流向后屏障沼泽的主要因素。但是，通过障碍物进行风沙运输在盐沼研究中很少受到关注。这里用沼泽岩心和风屏障沉积物跨过隔离岛的海侵和海退部分的风吹沉积物测量来研究风沙对后屏障沼泽的贡献。由宽幅冲刷风扇或高海拔沙丘山脊构成的后屏障沼泽地被风化砂供给，这极大地促进了垂直积聚，特别是在沼泽-屏障岛边缘附近。以沙丘-沼泽边界为界，以风沙的上部1 cm为基础，源自风沙的沼泽的体积百分比仅下降了约20 m。在每个沼泽深处采样的沙床都是由风沙组成的，在暴风雨在沼泽附近沉积沙质冲刷扇和/或减少全岛植被覆盖之后，随着时间的流逝，这些沙床很可能被放置。人们普遍认为，在暴风雨期间，在后垒沼泽沉积物中保存的沙床已经被迅速放置。然而，暴风雨后的风沙运移也应被视为在盐沼地层中较长时间形成沙床的重要机制。随着海平面的不断上升，风沙对背壁沼泽增生的贡献应增加，从而导致许多屏障岛变窄，从而缩短了沙丘与沼泽之间的运输距离。然而，沿着发达的海岸线，与人为发展相关的人为因素大大降低了沙丘和后壁沼泽之间的连通性。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第20期|248-259|共12页
  • 作者

    Antonio B. Rodriguez; Stephen R. Fegley; Justin T. Ridge; Beth M. VanDusen; Noel Anderson;

  • 作者单位

    University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell St., Morehead City, NC 28557, USA;

    University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell St., Morehead City, NC 28557, USA;

    University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell St., Morehead City, NC 28557, USA;

    University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell St., Morehead City, NC 28557, USA;

    University of North Carolina at Chapel Hill, Institute of Marine Sciences, 3431 Arendell St., Morehead City, NC 28557, USA;

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  • 正文语种 eng
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  • 关键词

    salt marsh; barrier island; dune; overwash; washover fan; paleotempestite;

    机译：盐沼屏障岛沙丘;过度清洗;冲洗风扇;古白云母;

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