Sediment transport over an accretional intertidal flat with influences of reclamation, Jiangsu coast, China

摘要: This paper focuses on the hydrodynamic and suspended sediment transport processes in response to sequential reclamations over intertidal flat, Jiangsu coast, which used be one of widest flats China. Investigations into patterns reveal that net fluxes increased from 102 kg m?1 upper flat 103–4 lower per tidal cycle. variation was caused mainly by phases current velocity, concentration (SSC), local bed geomorphology, inundation patterns, extreme weather conditions. The longshore component currents intensifies seaward flat. Extreme conditions (e.g. storms) strong winds were important factors affecting velocity structures, intensity residual currents, SSCs. SSCs characterized several peaks throughout These associated with combined wave-current interactions intense turbulences due initial flood surge. Furthermore, finer contained more clay materials during phase cycle, than ebb. Fine particles transported within water column landward but coarse currents. Overall, apt fine-grained coarse-grained seaward. pattern indicates are highly variable column, even for very shallow environments. cross-shore accounted only a small percentage total flux. However, this part supply dominated accretion has become narrower steeper, following reclamations. A negative feedback process existed maintain convex profile shape, although human activities (i.e. reclamation) could have modified natural process. surficial tended mid-upper coarser reclamations, reduction zone enhancement wave action Accretion, high rates, maintained sediment. In such an accretional system influences reclamation, width or slope is adjusted continuously. Before cease unable achieve equilibrium shape.