Journal ArticleDOI
Block removal and step backwearing as erosion processes on rock shore platforms: a preliminary case study of the chalk shore platforms of south‐east England
Uwe Dornbusch,David Robinson +1 more
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In this paper, a combination of soft copy photogrammetry, ortho-rectification, geo referencing and field measurement of step height are linked in a GIS environment to measure step retreat on chalk shore platforms at sample sites in the south of England over two periods, 19732001, 20012007.Abstract:
Shore platforms frequently exhibit steps or risers facing seaward, landwards or obliquely across-shore. A combination of soft copy photogrammetry, ortho-rectification, geo referencing and field measurement of step height are linked in a GIS environment to measure step retreat on chalk shore platforms at sample sites in the south of England over two periods, 19732001, 20012007. The methods used allow for the identification, delineation and measurement of historic change at high spatial resolution. The results suggest that while erosion of chalk shore platforms by step backwearing is highly variable, it appears to be of similar magnitude to surface downwearing of the same platforms measured by micro-erosion meters (MEMs) and laser scanning, in a range equivalent to 00006 00050my-1 of surface downwearing. This equates to annual chalk volume loss from the platforms, by the two erosion processes combined, of between 00012m3m-2 and 00100m3m-2. Results from the more recent years' data suggests that step retreat has variability in both space and time which does not relate solely to climatic variability. The results must be viewed with caution until much larger numbers of measurements have been made of both downwearing and step erosion at higher spatial and temporal resolution.read more
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Boulders as a signature of storms on rock coasts
TL;DR: In this paper, the authors present a review of the current state of knowledge about boulder dynamics, boulder responses to storms and boulders as sedimentary signatures of storm events and identify gaps in our conceptual and quantitative understanding.
Journal ArticleDOI
Reconceptualising the role of organisms in the erosion of rock coasts: A new model
TL;DR: In this paper, the authors reconceptualise the biological contributions to erosion of rock coasts into direct and facilitative types, and discuss the need for more appropriate reporting of rates of bioerosion.
Journal ArticleDOI
Recent acceleration in coastal cliff retreat rates on the south coast of Great Britain
Martin D. Hurst,Martin D. Hurst,Dylan H. Rood,Michael A. Ellis,Robert S. Anderson,Uwe Dornbusch +5 more
TL;DR: Past cliff retreat rates over millennial time scales for chalk cliffs on the south coast of Great Britain are derived by coupling high-precision cosmogenic radionuclide geochronology and rigorous numerical modeling to suggest acceleration is the result of thinning of cliff-front beaches, exacerbated by regional storminess and anthropogenic modification of the coast.
Journal ArticleDOI
Rocky coast processes: with special reference to the recession of soft rock cliffs
TL;DR: The findings are presented on (1) the temporal change in cliffline recession mode and (2) the effect of beach sediment at the cliff base on the cliff erosion.
Journal ArticleDOI
Late Holocene sea-cliff retreat recorded by 10Be profiles across a coastal platform: Theory and example from the English Channel
Vincent Regard,Thomas Dewez,Didier Bourlès,H. Anderson,Anne Duperret,Stéphane Costa,Laëtitia Léanni,Eric Lasseur,Kevin Pedoja,Grégoire M. Maillet +9 more
TL;DR: In this article, the authors explore a new method for documenting the long term retreat rate of sea cliffs based on measurements and modeling of 10Be concentration transects across present-day shore platforms.
References
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Hydraulic geometry and maximum flow efficiency as products of the principle of least action
He Qing Huang,Gerald C. Nanson +1 more
TL;DR: In this paper, a channel form factor (width/depth ratio) was introduced to explain the self-adjusting mechanism of alluvial channels, which can be illustrated directly with the basic flow relations of continuity, resistance and sediment transport.
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Rock coast geomorphology: Recent advances and future research directions
TL;DR: There have been considerable advances in rock coast research in the past decade as mentioned in this paper, as measured in terms of the number of active researchers and in a number of research papers being produced, highlighting many of the improvements that have been made in our ability to identify and measure the processes shaping rock coasts, at a range of spatial and temporal scales.
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Rates and patterns of erosion on inter-tidal shore platforms, Kaikoura Peninsula, South Island, New Zealand
Wayne J. Stephenson,R. M. Kirk +1 more
TL;DR: In this article, measured rates of erosion on shore platforms at Kaikoura Peninsula, South Island, New Zealand were measured with a micro-erosion meter and traversing micro-eomerosion meter, and the mean lowering rate was 1·130 mm a−1.
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Tidal wetting and drying on shore platforms: An experimental assessment
TL;DR: In this paper, the authors obtained 675 cores and cubes from basalts, sandstones, and argillites from shore platforms in eastern Canada, which were exposed to about 700 cycles over 12 months.
Journal ArticleDOI
Shore platforms; a neglected coastal feature
TL;DR: The first studies specifically concerned with British shore platforms are less than twenty years old as discussed by the authors, and they were mainly concerned with determining whether platforms are the product of wave erosion or weathering processes.