STUDY ON WAVE-INDUCED FLOW AROUND A SAND PROTECTOIN WORK OF ARTIFICIAL TAIDAL FLAT

This study investigates experimentally the wave-induced flow field formed on an artificial tidal flat. At the offshore edge of the tidal flat, submerged dike are often constructed to protect sand erosion, which affects the flow field. Hydraulic model experiments have been conducted to investigate the flow distribution and wave height distribution. It is found that circulating currents are formed around a submerged dike. The circulation flow is revealed to depend on the wave steepness and relative opening width of the dike to the wavelength. Results also show that the strong flow is formed in the vicinity of the opening of the dike, which suggests the local scour and countermeasures against the scour may be necessary.