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The use of video in the study of sandbar dynamics
Mallet, C.; Kingston, K.S.; Davidson, M.A.; Huntley, D.A. (2000). The use of video in the study of sandbar dynamics, in: Trentesaux, A. et al. Marine Sandwave Dynamics, International Workshop, March 23-24 2000, University of Lille 1, France. Proceedings.
In: Trentesaux, A.; Garlan, T. (Ed.) (2000). Marine Sandwave Dynamics, International Workshop, March 23-24 2000, University of Lille 1, France. Proceedings. Université de Lille 1: Lille. ISBN 2-11-088263-8. 240 pp., meer
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Documenttype: Congresbijdrage
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  • Mallet, C.
  • Kingston, K.S.
  • Davidson, M.A.
  • Huntley, D.A.
Abstract
    This contribution demonstrates the utility of video imaging techniques for nearshore studies with particular reference to the measurement of nearshore sandbar dynamics. The system is capable of obtaining quantitative measurements over a broad range of length scales (101 to 103m) and time scales (days to decades). Data is presented from a video site located at the mouth of an estuary at Teignmouth (S. Devon, England). This environment is characterised by the cyclical evolution of a sandbar system in the mouth of the estuary. External forcing factors for the sandbar evolution includes tides (meso- to macrotidal), wind-driven waves and to a lesser extent fresh water discharge from the Teign river. Ongoing video measurements beginning in February 1999 allow a qualitative representation of the dynamics of this sandbar system. Dramatic changes in the morphology of the ebb delta have occurred within the last nine months including the rapid accretion of sediment on two outer sandbars around the main channel. The appearance of these sandbars was accompanied by the simultaneous evolution of another sandbar system close to the beach, which is cross-shore oriented in February and long-shore oriented in November. Quantification of these processes is currently under investigation with the objective of studying the coastal evolution over several months.
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