A geotechnical correction for post‐depositional sediment compression: examples from the Forth valley, Scotland

Paul, Michael A.; Barras, Beverley F.

doi:10.1002/(sici)1099-1417(199803/04)13:2<171::aid-jqs369>3.3.co;2-q

Cited by 27 publications

(42 citation statements)

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“…The problem of compaction of sediments within sea-level research has not been fully resolved. The majority of sediments used as index points have been subjected to post-depositional displacement in altitude largely as a result of compaction of the underlying peat, clay and silt (Allen, 1995(Allen, , 1999(Allen, , 2000Paul and Barras, 1998;Shaw and Cemen, 1999;Shennan et al, 2000b). Shennan et al (2000b) reviewed some of the literature on this topic and stressed that compaction of deposits with a high sand fraction is very low, whereas compaction of peat may be as high as 90% by volume.…”

Section: The Data Bank Of Radiocarbon Dated Sea-level Index Pointsmentioning

confidence: 99%

“…Paul and Barras, 1998) are rarely applied. However, an alternative approach to reduce the problem of sediment compaction is to select subsets of sealevel index points that are relatively resistant to compaction.…”

Section: The Data Bank Of Radiocarbon Dated Sea-level Index Pointsmentioning

confidence: 99%

“…3), both for the maximum RSL values, from sites under thickest ice in Scotland, and for minimum RSL values, from sites bordering the southern North Sea. For the latter, the majority of index points come from thick sequences of unconsolidated estuarine sediments, mainly peat, silt and clay, and sediment consolidation may be significant (Allen, 1995(Allen, , 1999(Allen, , 2000Paul and Barras, 1998;Shennan et al, 2000b). Recent comparisons of model predictions and RSL observations (Peltier et al, 2002;Shennan et al, 2002a) make allowance for this by seeking best-fit solutions that lie through the scatter of index points from basal peats.…”

Section: Contrasts With Modelsmentioning

confidence: 99%

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Holocene land‐ and sea‐level changes in Great Britain

Shennan

Horton

2002

J Quaternary Science

479

342

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Analysis of more than 1200 radiocarbon dated samples that constrain relative sealevels in Great Britain over the past 16 000 yr provides estimates of current land-level changes (negative of relative sea-level change). Maximum relative land uplift occurs in central and western Scotland, ca. 1.6 mm yr −1 , and maximum subsidence is in southwest England, ca. 1.2 mm yr −1 . Sediment consolidation, arising from autocompaction as the sediment accumulates and from land drainage, increases the subsidence in areas with thick sequences of Holocene sediments, with an average effect equivalent to at least an extra ca. 0.2 mm yr −1 land subsidence, but more in parts of southeast England, 0.5-1.1 mm yr −1 . Modelled changes in tidal range during the mid-to late Holocene in eastern England suggest that the calculated rate of land subsidence is overestimated unless such changes are quantified. The effect is most significant for large coastal lowlands, the Fenland and Humber (ca. 0.5 and 0.6 mm yr −1 ), that were tidal embayments during the mid-to late Holocene.

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Section: The Data Bank Of Radiocarbon Dated Sea-level Index Pointsmentioning

confidence: 99%

Section: The Data Bank Of Radiocarbon Dated Sea-level Index Pointsmentioning

confidence: 99%

Section: Contrasts With Modelsmentioning

confidence: 99%

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Holocene land‐ and sea‐level changes in Great Britain

Shennan

Horton

2002

J Quaternary Science

479

342

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“…Autocompaction was calculated in two cores from North Sands and two cores from Blackpool Sands using the Paul and Barras (1998) model. Methods and classifications are based on standard techniques (e.g.…”

Section: Geotechnical Correctionmentioning

confidence: 99%

“…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: 99%

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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Holocene relative sea-level curves for the German North sea coast

Bungenstock

Weerts

2011

Int J Earth Sci (Geol Rundsch)

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A geotechnical correction for post‐depositional sediment compression: examples from the Forth valley, Scotland

Cited by 27 publications

References 0 publications

Holocene land‐ and sea‐level changes in Great Britain

Holocene land‐ and sea‐level changes in Great Britain

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

Holocene relative sea-level curves for the German North sea coast

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