Following the Sand Grains
Following the Sand Grains
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DOI：
10.3390/jmse10050631
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发表时间：
2022-05-01
影响因子：
2.9
通讯作者：
Novak, Alyssa
中科院分区：
文献类型：
--
作者：
FitzGerald, Duncan M.;Hughes, Zoe J.;Novak, Alyssa
当沿岸输运系统遇到潮汐入口时，复杂的机制涉及绕过沙到下漂障碍物。在这里，这一过程是在梅岛湾和埃塞克斯，马萨诸塞州，美国的Inlets检查。这项研究的一个主要发现是，沙子被转移沿着海岸，特别是在潮汐入口的包裹，在离散的步骤，并在十年尺度的时期。梅岛湾主落潮水道的向南方向，加上从落潮三角洲到下漂城堡颈障壁岛中部的沙洲向陆迁移，形成了一个海滩隆起。在施工阶段，沙子被隔离在突起处，障碍物的吐端变得缺乏沉积物，导致海岸线后退，并在埃塞克斯湾（城堡颈的下漂侧）口处扩大吐平台。风暴引起的沙嘴和整个沙嘴平台的侵蚀输沙被冲入埃塞克斯湾，填充渠道和扩大洪水三角洲。这项研究说明了沙传输的途径和过程沿着海岸线的屏障岛/潮汐入口系统，并提供了一个重要的例子，未来的流体动力学和沉积物输运模拟应努力复制的过程。
When longshore transport systems encounter tidal inlets, complex mechanisms are involved in bypassing sand to downdrift barriers. Here, this process is examined at Plum Island Sound and Essex Inlets, Massachusetts, USA. One major finding from this study is that sand is transferred along the coast-especially at tidal inlets-by parcels, in discrete steps, and over decadal-scale periods. The southerly orientation of the main-ebb channel at Plum Island Sound, coupled with the landward migration of bars from the ebb delta to the central portion of the downdrift Castle Neck barrier island, have formed a beach protuberance. During the constructional phase, sand is sequestered at the protuberance and the spit-end of the barrier becomes sediment starved, leading to shoreline retreat and a broadening of the spit platform at the mouth to Essex Bay (downdrift side of Castle Neck). Storm-induced sand transport from erosion of the spit and across the spit platform is washed into Essex Bay, filling channels and enlarging flood deltas. This study illustrates the pathways and processes of sand transfer along the shoreline of a barrier-island/tidal-inlet system and provides an important example of the processes that future hydrodynamic and sediment-transport modeling should strive to replicate.