Abstract
In the Khlong Wan coast, coastal erosion had occurred due to the construction of two offshore fishing ports till nine years ago. Although 11 detached breakwaters were constructed, the recovery of the beach is insufficient. Especially, the opening area between the groin of the old fishing port and one detached breakwater is dangerous to coastal erosion and wave overtopping.
Therefore, in this paper, the mechanism of the coastal erosion was confirmed by the examination using one-line simulation. Then, the safety at the most dangerous section (320 - 400m in longshore distance) by existing countermeasures was clarified and three improvement plans for raising the safety to coastal disaster were examined. The models of Ca et al. and Yamamoto et al. were used to evaluate the coastal erosion and scour during one storm surge, and the equations of Van der Meer et al. and Yamamoto & Horikawa's were used to evaluate the wave overtopping rates. As conclusion, the comprehensive comparison of examination results made it clear that the sand nourishment is the most proper countermeasure.
