Abstract
In this paper, we propose a method of calculation to predict quantitatively the onshoreoffshore sand movement and the wave deformation on a wave-current coexistent system by making certain assumptions about a river mouth. Results calculated by this method were compared with experimental data obtained for the coexistent system in a two-dimensional wave tank.
The distribution of wave height on the breaker zone, which was required for calculation of the sand transport rate, was analyzed by the use of a BORE MODEL. The model was established on the assumption that the value of energy loss in a breaking wave was equivalent to one of bore. The wave height distribution on the offshore side of the breaking point was presumed for the third order approximate solution of Stokian waves on the coexistent system. The breaking point was obtained by use of Miche's criteria equation.
The local sand transport rate could be calculated by use of a POWER MODEL. The predominant direction of sand transport was recognized using a judgment equation derived from the experimental results.
Using the calculated distributions of the wave height and the sand transport rate, the transformation of sea and river bottom was estimated on the basis of the equation of continuity of the sand transport rate.
The results obtained by these analytical methods agreed well with the experimental results.
