Assessment of peat compressibility: is there an easy way?

Price, Jonathan S.; Cagampan, Jason P.; Kellner, Erik

doi:10.1002/hyp.6068

Cited by 69 publications

(62 citation statements)

References 20 publications

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“…Leonard and Luther, 1995) create more open microstructures compared to those observed in tidal flat environments, where flow velocities are greater (Burland, 1990). Less dense sediments are more prone to compression than their denser equivalents (Burland, 1990;Price et al, 2005;Skempton, 1970). In addition, organic-rich sediments are more prone to compression than their minerogenic equivalents, since organic matter is compressible (Head, 1988).…”

Section: Controls On Compression Behaviourmentioning

confidence: 99%

Modelling the effects of sediment compaction on salt marsh reconstructions of recent sea-level rise

Brain

Long

Woodroffe

et al. 2012

Earth and Planetary Science Letters

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. (2012) 'Modelling the eects of sediment compaction on salt marsh reconstructions of recent sea-level rise.', Earth and planetary science letters., 345-348 . pp. 180-193. Further information on publisher's website:http://dx.doi.org/10.1016/j.epsl.2012.06.045Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Earth and Planetary Science Letters. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. A denitive version was subsequently published in Earth and Planetary Science Letters, 345348, 2012Letters, 345348, , 10.1016Letters, 345348, /j.epsl.2012 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThis 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 (< 0.5 m) uniform-lithology stratigraphies, or shallow near-surface salt marsh deposits in regressive successions, experience negligible compaction. Spatial variations in compression could be interpreted as 'sea-level fingerprints'that might, in turn, be wrongly attributed to oceanic or cryospheric processes. However,

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Section: Controls On Compression Behaviourmentioning

confidence: 99%

Modelling the effects of sediment compaction on salt marsh reconstructions of recent sea-level rise

Brain

Long

Woodroffe

et al. 2012

Earth and Planetary Science Letters

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“…The level of decomposition can provide an indication of the likely geotechnical properties, with more decomposed peats generally less compressible and also less prone to further consolidation (Price et al, 2005). The structural rearrangement of the peat fibres and the manner in which pore water is held and expelled between micro-and macro-pores (O'Kelly, 2013) has been linked to high secondary compression in peat (Hobbs, 1986;Mesri and Ajlouni, 2007).…”

Section: Introductionmentioning

confidence: 99%

Stimulated decomposition in peat for engineering applications

Pichan

O’Kelly

2013

Proceedings of the Institution of Civil Engineers - Ground Impr

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Peat deposits are highly compressible, undergoing significant long-term settlement, particularly for fibrous peat.Since decomposition of organic matter can have a significant effect on compression behaviour, the ability to artificially stimulate and pre-decompose a bearing peat stratum prior to the main construction works may mitigate against increased compression rates reported to occur over the design life. This paper presents a feasibility trial of a technique that accelerates the decomposition process in peat prior to entering into full laboratory and field testing.The main decomposition limiting factors of pH and carbon:nitrogen (C:N) ratio are adjusted by adding sufficient amounts of basic and nitrogenous materials. The proposed technique can be tailored for specific peat deposits and can also be achieved in a more sustainable manner. In the trial on moderately decomposed fibrous Sphagnum peat, different peat blends were prepared using additives of peat pulverised fuel ash (PPFA) and urea. Optimum C:N ratio and pH for decomposition were achieved by adding ,21 kg PPFA and ,1 . 5 kg urea per cubic metre of wet peat. The availability of natural decomposers in the peat was also confirmed pre-and post-treatment using a plate count technique, with measured microorganism populations of the order of 10 5 colony-forming units (CFU)/g dry peat.

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“…Based on observations of bulk densities of peat, we assume that ρ max is 140 kg m −3 (Price et al, 2005). The MW C term converts the expression into mol C m −2 , the SiBCASA internal units for carbon.…”

Section: Dynamic Solmentioning

confidence: 99%

The importance of a surface organic layer in simulating permafrost thermal and carbon dynamics

Jafarov

Schaefer

2016

The Cryosphere

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Abstract. Permafrost-affected soils contain twice as much carbon as currently exists in the atmosphere. Studies show that warming of the perennially frozen ground could initiate significant release of the frozen soil carbon into the atmosphere. Initializing the frozen permafrost carbon with the observed soil carbon distribution from the Northern Circumpolar Soil Carbon Database reduces the uncertainty associated with the modeling of the permafrost carbon feedback. To improve permafrost thermal and carbon dynamics we implemented a dynamic surface organic layer with vertical carbon redistribution, and introduced dynamic root growth controlled by active layer thickness, which improved soil carbon exchange between frozen and thawed pools. These changes increased the initial amount of simulated frozen carbon from 313 to 560 Gt C, consistent with observed frozen carbon stocks, and increased the spatial correlation of the simulated and observed distribution of frozen carbon from 0.12 to 0.63.

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Assessment of peat compressibility: is there an easy way?

Cited by 69 publications

References 20 publications

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

Stimulated decomposition in peat for engineering applications

The importance of a surface organic layer in simulating permafrost thermal and carbon dynamics

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