The wave-induced evolution of the surface profile of an artificial shallow is investigated experimentally in terms of temporal changes in bottom flow velocity on the surface of the shallow and pore-water pressure inside the surface layer of the shallow. Experimental results show that the relative vertical effective stress ratio is always negatively correlated with the Shields parameter defined as positive landward, and suggest that offshore sediment transport can be accelerated regardless of the profile evolution of the shallow. Moreover, it is found that sediment transport on the shallow can always be assessed reasonably well using a Shields parameter modified to consider pore-water pressure on the surface layer of the shallow, and consequently the consideration of the pore-water pressure is essential to assess the topographic change of the shallow.
