Alluvial Cutoffs in Wales and the Borderlands

  1. J. D. Collinson and
  2. J. Lewin
  1. G. W. Lewis and
  2. J. Lewin

Published Online: 29 APR 2009

DOI: 10.1002/9781444303773.ch11

Modern and Ancient Fluvial Systems

Modern and Ancient Fluvial Systems

How to Cite

Lewis, G. W. and Lewin, J. (1983) Alluvial Cutoffs in Wales and the Borderlands, in Modern and Ancient Fluvial Systems (eds J. D. Collinson and J. Lewin), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444303773.ch11

Author Information

  1. Geography Department, University College of Wales, Aberystwyth SY23 3DB, UK

Publication History

  1. Published Online: 29 APR 2009
  2. Published Print: 7 FEB 1983

ISBN Information

Print ISBN: 9780632009978

Online ISBN: 9781444303773

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Keywords:

  • alluvial cutoffs in Wales and the borderlands;
  • cutoff types;
  • cutoff distribution;
  • cutoff dating and infill rates;
  • frequency of cutoffs for historically datable time periods

Summary

An extensive survey of 964 km of river valley identified 145 river channel cutoffs. Examination of historic map and air photograph evidence allows analysis of the development pattern and timing of many of the cutoffs, whilst results from additional ground survey of the sedimentary infill are also presented for 92 of the cutoffs. Most cutoffs (55%) are of simple chute type, 16% involve simple neck cutoffs, and 13% involve multiloop forms. ‘Mobile bar’ cutoffs account for 11%. The geographical distribution of cutoffs and cutoff types is discussed. Forty-five per cent of identified cutoffs can be dated to within approximately the last 100 yr, while infill sedimentation rates average 0·015 m yr−1.