Dune Migration on Macrotidal Flats Under Symmetrical Tidal Flows: Garolim Bay, Korea

摘要

Intertidal dunes provide crucial information on sand movements and hence the present state of growth or decay of the particular tidal flats. However, evaluation of sand transport based merely on the dune configuration, emerging on subaerially exposed intertidal flats or ancient deposits, could be misleading without considering the degree of tidal asymmetry. Given the literature focused mostly on dune migration by predominant tidal currents, quantitative relationships between dunes and overlying flows need to be established for tidal flats governed by strong, symmetrically reversing tidal currents. To fulfill such a requirement, a field experiment site on macrotidal and symmetrically tidal flats in Garolim Bay, Korea, was chosen and investigated for the mechanical processes of dune migration.