SETTLEMENT OF ROCK SEAWALL ON ERODING FORESHORE OF SAND BEACH

摘要

The effectiveness of structures placed on the foreshore of a sand beach and a berm was tested and confirmed to reduce wave overtopping and sand overwash, expanding upon the previous comparison test conducted by Kim et al. (2016) with using sand and two different sizes of stones shown in Table 1. Test contains two test series of a rock seawall (Series R) and a dune with a buried seawall (Series B) on the foreshore as shown initial of the two structures in Figure 1 which reduced both wave overtopping and sand overwash even after its deformation. Damage was inflicted upon these two structures which seems to be caused by either stone displacement or structure settlement. To find out which was the case, detailed analysis has been conducted, along with an application of the cross-shore numerical model CSHORE (Kobayashi 2016) for the purpose of simulating sand and stone interactions in the swash zone on the sand beach.