태풍시 방파제의 소파블록 거동에 관한 연구

Abstract

In this study, the basic research was conducted to determine the impact on the stability of wave dissipation blocks installed in the breakwaters of existing ports and shorelines against the increase of external force due to climate change. The purpose of this study is to investigate the long-term changes in sea level in coastal areas and to develop the movement analytical model of the breakwater dissipation block during high wave invasion caused by the typhoon. The results obtained in this study are summarized as follows. A tetrapod (TTP) installed on the coast of Busan showed that the design wave heights of non-breaking and breaking waves were 3.66–6.44 and 3.5–6.25 m, respectively. According to an analysis of the annual mean sea level over 11 years on the coast of Busan, In Ulsan, sea level is down to -1.5 mm/year, while Busan and Geoje islands are rising to 2.1 mm/year and 5.0 mm/year, respectively. thus, Dissipation blocks in the rubble mound breakwater will be affected by future increases in external coastal forces and countermeasures should be implemented. Hydraulic modeling (via numerical analysis) reproduced and visualized the movements of the TTP in the breakwater of the port of Namhae Mulguen. It was confirmed that the TTP deviated from the position where the maximum horizontal flow velocity in the direction of the offshore (-) and upward () direction occurred, and the maximum uplift pressure increased with the change of depth of water and typhoon. Finally, It is believed that the results of this study can be used as basic data for design to secure the stability of the breakwater in the future and for establishing mid- to long-term measures to reduce damage from the dissipation blocks in the event of a typhoon.