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      Modelling the effects of tidal range and initial bathymetry on the morphological evolution of tidal embayments

      van Maanen, Barend; Coco, Giovanni; Bryan, Karin R.
      DOI
       10.1016/j.geomorph.2013.02.023
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      van Maanen, B., Coco, G., & Bryan, K. R. (2013). Modelling the effects of tidal range and initial bathymetry on the morphological evolution of tidal embayments. Geomorphology, first published online 4 March 2013.
      Permanent Research Commons link: https://hdl.handle.net/10289/7471
      Abstract
      Tidal embayments are characterized by a wide variety of landscape features, often including either complex tidal channel networks or extensive flood-tidal deltas. The origin of these features and the influence of hydrodynamic drivers and initial geological setting on their long-term characteristics are essentially unexplored. A model was applied to simulate the long-term morphological evolution of tidal embayments, with the purpose of providing insight into the environmental conditions that lead to the differences in tidal embayment morphology. Numerical simulations indicated that the interaction between hydrodynamics, sediment transport, and the evolving topography gives rise to the formation of channel networks. The tidal range and the depth of the initially unchannelized tidal basin controlled the way in which the morphology evolved and determined the timescale over which channels and intertidal areas developed. Channel network formation occurred more rapidly when the tidal range increased and/or when the initial basin depth decreased. Tidal basins with a large initial depth showed the development of a flood-tidal delta and for these deep basins channel incision could remain absent over long timescales. Both tidal range and initial bathymetry affected final basin hypsometry and channel network characteristics, including the channel density and the fraction of the basin occupied by the channels. All the simulated morphologies, with different combinations of the tidal range and depth of the basin, evolved towards a state of less morphodynamic activity for which the relative intertidal area was proportional to the ratio of tidal amplitude to basin depth.
      Date
      2013
      Type
      Journal Article
      Publisher
      Elsevier
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      • Science and Engineering Papers [3086]
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