Fine particle retention and deposition in regions of cyclonic tidal current rotation

Fine particle retention and deposition in regions of cyclonic tidal current rotation
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气旋潮流旋转区域的细颗粒滞留和沉积

DOI:
10.1016/j.margeo.2019.01.006
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发表时间:
2019
期刊:
影响因子:
2.9
通讯作者:
Williams M
Williams M
中科院分区:
地球科学2区
文献类型:
--
作者:
Williams M

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大陆架海底沉积物控制着各种海洋地球化学过程,但其组成,特别是细颗粒沉积物的组成,仍然很难预测。泥浆或细颗粒沉积物沉积和滞留的机制尚未完全了解。使用沉积物数据和西北欧陆架海的水动力模型,细底栖沉积物组成和气旋潮流旋转区域之间存在的关系。与反气旋情况相比,气旋潮汐底栖边界层的厚度减小,促进了细沉积物的沉积和再悬浮物质的捕获。增加海底边界层厚度的影响,椭圆率的影响或没有,揭示了一些局限性的方法只侧重于床剪切应力和沉积物的路径,以预测泥沉积的位置。一个潮汐边界层预测,包括椭圆率沿潮流大小和深度被证明在空间上同意与地图的泥沉积。
Benthic sediments in continental shelf seas control a variety of biogeochemical processes, yet their composition, especially that of fine sediment, remains difficult to predict. Mechanisms for mud or fine sediment deposition and retention are not fully understood. Using sediment data and a hydrodynamic model of the Northwest European shelf seas, a relationship is shown to exist between fine benthic sediment composition and regions of cyclonic tidal current rotation. The reduced thickness of cyclonic tidal benthic boundary layers compared with the anticyclonic case promotes deposition of fine sediment and trapping of resuspended material. Adding the effects of the benthic boundary layer thickness, as influenced by ellipticity or not, sheds some light on the limitations of approaches only focusing on bed shear stress and sediment pathways to predict the location of mud deposits. A tidal boundary layer predictor that includes ellipticity alongside tidal current magnitude and depth was shown to spatially agree with maps of mud deposits.
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