潮下海草(Zostera marina)草甸中相对暴露在海浪中的沙质沉积物分类

IF 2.6 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

海草通过影响当地的水动力、地貌和沉积物特性,对沉积潮间带和潮下带生态系统产生影响。海草对流体力学的影响是降低海草冠层中的流速,从而导致净沉积速率增加和粒径减小。对海草-水动力-沉积物反馈系统的大多数研究都是在潮汐主导条件下的淤泥床和细沙床进行的,主要是在潮间带。在这里,我们使用了来自斯illy 岛一个相对暴露于海浪的潮下海草(Zostera marina)草甸的沉积学数据,该草甸上有中细沙床,结果表明海草草甸内的沙子确实比邻近未植被区域的沙子更细。不过,与以往研究不同的是,这并不是因为海草草甸内的泥/淤泥含量增加,而是整个沙粒部分的沉积物粒径中值发生了近 0.1 毫米的变化,从 0.25 毫米(细沙到中沙)变为 0.35 毫米(中沙)。所研究的海草草甸具有明显的空间结构特征,包括植被 "山脊 "和裸沙 "山谷"。即使是海草草甸中的裸沙山谷,其沙质也比相邻的植被山脊粗得多,这进一步证实了海草草甸中海浪过程对沉积物分选的效率。结论是,任何涉及与海草环境相关的沉积物输运过程的数值建模都必须考虑到纹理特征的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sediment sorting within a relatively wave-exposed and sandy subtidal seagrass (Zostera marina) meadow

Seagrasses impact on sedimentary intertidal and subtidal ecosystems by affecting local hydrodynamics, geomorphology and sediment properties. Their influence on hydrodynamics is to reduce flow velocities in their canopies, and this leads to increased net sedimentation rates and reduction of the grain size. Most investigations of the seagrass-hydrodynamics-sediment feedback system has been carried out over silt and fine-sand beds under tide-dominated conditions, mostly in the intertidal zone. Here, we use sedimentological data from a relatively wave-exposed and subtidal seagrass (Zostera marina) meadow in the Isles of Scilly with a fine-to-medium sand bed and show that the sand within the seagrass meadow is indeed finer than in adjacent, unvegetated regions. However, in contrast to previous studies, this is not due to increased mud/silt content within the seagrass meadow, but an almost 0.1-mm shift in the median sediment size across the sand fraction from 0.25 mm (fine to medium sand) to 0.35 mm (medium sand). The studied seagrass meadow is characterised by a distinct spatial structure comprising of vegetated ‘ridges’ and bare sand ‘valleys’. Even the bare sand valleys within the seagrass meadow are characterised by significantly coarser sand than the adjacent vegetated ridges, providing further confirmation of the efficiency of sediment sorting by wave processes that takes place within seagrass meadows. It is concluded that any numerical modelling involving sediment transport processes associated with seagrass environments must account for variability in the textural characteristics.

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来源期刊
Marine Geology
Marine Geology 地学-地球科学综合
CiteScore
6.10
自引率
6.90%
发文量
175
审稿时长
21.9 weeks
期刊介绍: Marine Geology is the premier international journal on marine geological processes in the broadest sense. We seek papers that are comprehensive, interdisciplinary and synthetic that will be lasting contributions to the field. Although most papers are based on regional studies, they must demonstrate new findings of international significance. We accept papers on subjects as diverse as seafloor hydrothermal systems, beach dynamics, early diagenesis, microbiological studies in sediments, palaeoclimate studies and geophysical studies of the seabed. We encourage papers that address emerging new fields, for example the influence of anthropogenic processes on coastal/marine geology and coastal/marine geoarchaeology. We insist that the papers are concerned with the marine realm and that they deal with geology: with rocks, sediments, and physical and chemical processes affecting them. Papers should address scientific hypotheses: highly descriptive data compilations or papers that deal only with marine management and risk assessment should be submitted to other journals. Papers on laboratory or modelling studies must demonstrate direct relevance to marine processes or deposits. The primary criteria for acceptance of papers is that the science is of high quality, novel, significant, and of broad international interest.
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