Modelling self-weight consolidation in Holocene sediments

Tovey, Keith; Paul, Michael A.

doi:10.1007/s100640100126

Cited by 16 publications

(13 citation statements)

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“…There is no commonly accepted methodology that is used to correct sea-level index points for autocompaction (e.g., Pizzuto and Schwendt, 1997;Paul and Barras, 1998;Rybczyk et al, 1998;Tovey and Paul, 2002;Williams, 2003;Bird et al, 2004;Massey et al, 2006b;Edwards, 2006). This is in part due to the lack of geotechnical models capable of dealing with the complex stratigraphies found in coastal sediments (Allen, 1999;Massey et al, 2006b;Shennan et al, 2006).…”

Section: Introductionmentioning

confidence: 98%

Relative sea‐level change and postglacial isostatic adjustment along the coast of south Devon, United Kingdom

Massey

Gehrels

Charman

et al. 2008

J Quaternary Science

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2008. Relative sea-level change and postglacial isostatic adjustment along the coast of south Devon, United Kingdom. ABSTRACT: Previous sea-level studies suggest that southwest Britain has the fastest subsiding coastline in the United Kingdom, but tide-gauge data, GPS and gravity measurements and geophysical models show little evidence of anomalous subsidence in this region. In this paper we present 15 new sea-level index points from four coastal barrier systems in south Devon. Eight are from compaction-free basal sediments and others were corrected for autocompaction. Our data suggest that relative sea level along the south Devon coastline has risen by 21 AE 4 m during the past 9000 years. Sea-level rise slowed during the middle and late Holocene and a rise of 8 AE 1 m has occurred since ca. 7000 cal. yr BP. Anomalous ages for many rejected points are attributed to sediment reworking during barrier transgression. The relative sea-level history during the early and middle Holocene shows a good fit with geophysical model predictions, but the geological and modelled data diverge in the later Holocene. Unlike the geophysical models, sea-level index points cannot differentiate between late Holocene relative sea-level histories of south Devon and southwest Cornwall. It is suggested that this discrepancy can be resolved by obtaining additional high-quality sea-level index points covering the past 4000 years.

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Section: Introductionmentioning

confidence: 98%

Relative sea‐level change and postglacial isostatic adjustment along the coast of south Devon, United Kingdom

Massey

Gehrels

Charman

et al. 2008

J Quaternary Science

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“…Numerical models represent valuable tools useful for understanding and predicting peat compaction at a range of spatial and temporal resolutions. Existing models allow calculating syn‐depositional compaction in aggrading successions of different composition [e.g., Paul and Barras , 1998; Tovey and Paul , 2002; Meckel et al , 2007]. But, like many other peat compaction models (for an overview see van Asselen et al [2009]) these models have critical shortcomings considering their application to Holocene fluvial‐deltaic settings containing peat.…”

Section: Introductionmentioning

confidence: 99%

Contribution of peat compaction to relative sea-level rise within Holocene deltas

Asselen

Karssenberg

Stouthamer

2011

Geophys. Res. Lett.

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[1] Modern and forecasted flooding of deltas is accelerated by subsidence of Holocene deposits. Subsidence caused by tectonics, isostasy, sediment compaction and anthropogenic processes, combined with eustatic sea-level rise, results in drowning and increased flood risk within densely populated deltas. Many deltaic sedimentary successions include substantial amounts of peat, which is highly compressible compared to clay, silt and sand. Peat compaction, therefore, may contribute considerably to total delta subsidence. Existing studies are inadequate for quantifying peat compaction across deltas. We present a numerical peat compaction model calibrated with an extensive field dataset. The model quantifies spatial and temporal trends in peat compaction within fluvial-dominated Holocene flood basin sequences of different compositions. Subsidence due to peat compaction is highly variable in time and space, with local rates of up to 15 mm/yr, depending on sedimentary sequence. This is extremely important information for developing sound delta management strategies. Artificial groundwater table lowering may cause substantial additional subsidence. Subsidence due to peat compaction might even exceed estimates of relative sea-level rise, and thus, may seriously increase the risk of delta drowning and human vulnerability to flooding.Citation: van Asselen, S., D. Karssenberg, and E. Stouthamer (2011), Contribution of peat compaction to relative sea-level rise within Holocene deltas, Geophys. Res. Lett., 38, L24401,

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“…Sediment subsamples of known (dry) weight were burned at 550˚C for 4 h to calculate the percentage of organic mass loss. Bulk density was calculated to reconstruct stratigraphic changes through the core and detect possible auto compaction through overburden (Tovey and Paul, 2002;Brain et al, 2011). Sand content was also measured following Barnett et al (2016).…”

Section: Methodsmentioning

confidence: 99%

Reconstructing late Holocene relative sea‐level changes at the Magdalen Islands (Gulf of St. Lawrence, Canada) using multi‐proxy analyses

Barnett

Bernatchez

Garneau

et al. 2017

J Quaternary Science

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Proxy records of late Holocene relative sea‐level changes are important for our understanding of mechanisms that drive contemporary sea‐level trends. In the Gulf of Saint Lawrence (eastern Canada), the Magdalen Islands currently experience higher than global average rates of relative sea‐level rise. This article presents original reconstruction data of sea‐level changes from the Magdalen Islands over the past few millennia collected from a variety of coastal deposits and proxy records including salt‐marsh foraminifera, testate amoebae and plant macrofossils. Reconstructed late Holocene relative sea‐level trends are between 1.3 and 2.0 mm a−1 for the past 2000 years. When combined with contemporaneous trends in tide‐gauge data from Cap‐aux‐Meules (Magdalen Islands), multi‐proxy data show acceleration in the rate of relative sea‐level rise to over 4 mm a−1 during the 20th century. This signal corresponds to similar inflexions also registered in salt marshes and tide‐gauge data along the east coast of North America.

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Modelling self-weight consolidation in Holocene sediments

Cited by 16 publications

References 0 publications

Relative sea‐level change and postglacial isostatic adjustment along the coast of south Devon, United Kingdom

Relative sea‐level change and postglacial isostatic adjustment along the coast of south Devon, United Kingdom

Contribution of peat compaction to relative sea-level rise within Holocene deltas

Reconstructing late Holocene relative sea‐level changes at the Magdalen Islands (Gulf of St. Lawrence, Canada) using multi‐proxy analyses

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