Spatial and temporal variations in soft-cliff erosion along the Holderness coast, East Riding of Yorkshire, UK

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• 作者：K. Pye ; S. J. Blott
• 关键词：Holderness ; East Riding ; Yorkshire ; Soft cliffs ; Erosion
• 刊名：Journal of Coastal Conservation
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：19
• 期：6
• 页码：785-808
• 全文大小：20,646 KB
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• 作者单位：K. Pye (1) (2)
  S. J. Blott (1)
  
  1. Kenneth Pye Associates Ltd, Blythe Valley Innovation Centre, Blythe Valley Park, Solihull, B90 8AJ, UK
  2. Faculty of Engineering and the Environment, University of Southampton, University Road, Highfield, Southampton, SO17 1BJ, UK
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Nature Conservation
  
• 出版者：Springer Netherlands
• ISSN：1874-7841

文摘

The Holderness coast is composed largely of ‘soft-Quaternary sediments, mainly glacial till, which form cliffs up to 38 m high. Cliff erosion rates have shown a complex pattern of spatial and temporal variation over the past 160 years which reflects interaction of natural processes and human interventions, notably building of coastal defences at Bridlington, Hornsea, Withernsea, Mappleton, and Easington. A former single coastal cell, extending between Flamborough Head and the Spurn Peninsula, is breaking down into a series of separate sub-cells defined by sections of defended coast. Between these ‘hard points-the shoreline is developing as a series of shallow bays which are deepest immediately to the south (downdrift) of the defences. Superimposed on this pattern are smaller-scale variations which reflect the effects of dynamic beach features on wave energy exposure at the cliff toe. Cliff recession rates can exceed 4 m a? when beach troughs lie in front of the cliff toe but may fall close to zero as a sand wave passes. Erosion rates on the undefended coast showed an increase in the period 1989-013 compared with earlier epochs and further increases can be anticipated due to sea level rise over the course of the next century. The effects of climate change on storminess remain uncertain but any increase would further enhance the erosional trend. The implications are future increased rates of cliff top recession and increased risk to infrastructure close to the coast in the medium to longer term. Increased erosion rates will increase the rate of sediment supply to the nearshore system, but it is unclear how much of the fine sediment released will be transported into the Humber estuary to maintain tidal flats and saltmarshes, and how much of the sand and gravel will travel along the beach system to sustain the Spurn Peninsula. Keywords Holderness East Riding Yorkshire Soft cliffs Erosion