Modelling the effects of sediment compaction on salt marsh reconstructions of recent sea-level rise
Modelling the effects of sediment compaction on salt marsh reconstructions of recent sea-level rise
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DOI：
10.1016/j.epsl.2012.06.045
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发表时间：
2012-09-01
影响因子：
5.3
通讯作者：
Parnell, Andrew C.
中科院分区：
文献类型：
--
作者：
Brain, Matthew J.;Long, Antony J.;Parnell, Andrew C.
本文量化了沉积物压实对世纪海平面上升幅度的潜在影响，如盐沼沉积物重建。本文首先建立了低能潮滩和盐沼沉积物的物理和压缩特性数据库。关键的压缩参数由有机物含量（烧失量）控制，但压缩性受局部尺度过程的调节，特别是沉积物干燥的可能性。使用这个数据库和标准的岩土工程理论，我们使用的数值模拟方法来生成，随后“分解”的理想化的潮间带地层的范围。我们发现，压缩可以显着有助于重建加速度在最近的海平面，特别是在海侵地层。根据地层柱的厚度，这种影响的幅度足以使当地海平面每年上升0.1至0.4毫米。与此相反，来自浅层的记录（
This paper quantifies the potential influence of sediment compaction on the magnitude of nineteenth and twentieth century sea-level rise, as reconstructed from salt marsh sediments. We firstly develop a database of the physical and compression properties of low energy intertidal and salt marsh sediments. Key compression parameters are controlled by organic content (loss on ignition), though compressibility is modulated by local-scale processes, notably the potential for desiccation of sediments. Using this database and standard geotechnical theory, we use a numerical modelling approach to generate and subsequently 'decompact' a range of idealised intertidal stratigraphies. We find that compression can significantly contribute to reconstructed accelerations in recent sea level, notably in transgressive stratigraphies. The magnitude of this effect can be sufficient to add between 0.1 and 0.4 mm yr(-1) of local sea-level rise, depending on the thickness of the stratigraphic column. In contrast, records from shallow (