亚热带浅海湾在极端偶发性洪水作用下的快速形态沉积发展

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY Continental Shelf Research Pub Date : 2024-07-01 DOI:10.1016/j.csr.2024.105252
Ryan Beecroft , Remo Cossu , Nathaniel Deering , Nicholas Hutley , Simon Albert , Paul Maxwell , Alistair Grinham
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引用次数: 0

摘要

沿岸带陆地沉积物供应量的变化对沉积物输运过程和生态依赖性产生影响。这项研究调查了 2020 平方公里浅水沼泽地在洪水诱发沉积物供应后的表层沉积物分布和迁移情况。在 2015 年至 2019 年的后续调查期间,对 221 个常见地点进行了广泛的实地取样,发现细沉积物组分显著减少,表层泥覆盖面积减少了 367 平方公里。风-波沉积物迁移过程控制了细沉积物的空间分布,从浅层沉积带输出了 2300 万吨泥浆。在更广泛的范围内,海草草甸等敏感的底栖栖息地显示出栖息地重新定居的迹象,这与淤泥含量减少的区域相吻合。尽管这些短期前景看好,但已制定的细沉积物预算表明,持续的陆地沉积将耗尽莫尔顿湾内的主要沉积物汇,从而有效降低该系统缓冲未来沉积事件的能力。
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Rapid morphosedimentary development of a shallow subtropical embayment in response to extreme episodic flooding

Variability in supply of terrestrial sediments to the coastal zone impacts sediment transport processes and ecological dependencies. This study investigated surface sediment distribution and transportation within a 2020 km2 shallow embayment following a period of flood induced sediment supply. Extensive field sampling of 221 common sites between 2015 and the 2019 follow-up survey presented, identified significant reduction in fine sediment fractions, evident through a 367 km2 decrease in surface mud coverage. Wind-wave sediment transport processes controlled the spatial distribution of fine sediments, exporting 23 million tonnes of mud from the shallow sedimentation zones. In a broader context, sensitive benthic habitats such as seagrass meadows exhibited signs habitat recolonisation coinciding with areas of reduced mud content. Despite these promising short-term outlooks, the developed fine sediment budget suggests ongoing terrestrial sedimentation will exhaust key sediment sinks within Moreton Bay, effectively reducing the system's ability to buffer future sedimentation events.

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来源期刊
Continental Shelf Research
Continental Shelf Research 地学-海洋学
CiteScore
4.30
自引率
4.30%
发文量
136
审稿时长
6.1 months
期刊介绍: Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.
期刊最新文献
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