A review of sea level change during the flandrian period concludes that a bteady rather than oscillatory rise has occurred. In Britain the eustatic rise has been modified by isostatic effects; these are reflected in slightly different sea level curves for the Severn, Thames and Clyde estuaries. Higher undrained shear strengths recorded in the outer Thames estuary and taken to imply a transgressive/regressive sequence are inconclusive of an oscillatory curve; such desiccated horizons are not present in the Severn levels. The patternof sea level rise is reflected in the nature of the sediment. The characteristics of a silty sand deposited during a period of rapid sea level rise and overlain by a laminated mud/silty sand sequence with occasional peat horizonb are discussed. A proposed description for laminae thickness is presented. Bioturbation may modify the sediment character of tidal river environments. Tidal pills, common in salt marsh areas, are difficult to detect wheits infilled. The geotechnical affects of the features are related to their different consolidation properties and skin friction compared with the normally deposited (layered) sediments. The importance of laminations in soils to lateral pore water dissipation and the implications for road embankment construction are considered. (Author/TRRL)

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  • Supplemental Notes:
    • This paper was presented at the 19th Regional Conference of the Engineering Group of the Geological Society on the Engineering Geology of Tidal Rivers.
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    LONDON,   United Kingdom  W1V 0JU
  • Authors:
    • HAWKINS, A B
  • Publication Date: 1984

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  • Accession Number: 00395523
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Oct 31 1985 12:00AM