Recession of the Littoral Zone Cliffs of the Bristol Channel, U.K.

by A. T. Williams, Polytechnic of Wales, Pontypridd, United Kingdom,
N. R. Morgan, Polytechnic of Wales, Pontypridd, United Kingdom,
P. Davies, Polytechnic of Wales, Pontypridd, United Kingdom,

Document Type: Proceeding Paper

Part of: Coastal Zone '91


A recent investigation of the mass movement modified cliffs along the Bristol Channel coastline has been achieved by utilising ground survey data, historical and contemporary cartographic data and oblique aerial and terrestrial photographs. This has revealed that the solid geology annual recession rates are a result of a complex integration of sub-aerial and marine processes, through the mechanisms of translational and deep rotational sliding, small-scale sliding, flows, toppling and translational mode rock falls. Averaged annual recession rates of 20 cm for Triassic cliffs, 6 to 8 cm for Jurassic, 4 cm for Devonian and negligible values for Carboniferous equivalents were obtained.

Subject Headings: Littoral zones | Cliffs | Sliding effects | Shores | Ground motion | Aerial surveys | Surveys (non-geomatic) | Mapping

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