사석방파제 사면상의 최대유속 발생특성에 관한 연구

Abstract

In this study, the maximum water particle velocity on the slope of rubble mound breakwaters is numerically computed to investigate the stability of rubble mound breakwaters due to the water level change. Two-dimensional numerical wave flume based on the VOF method was used. Numerical model was calibrated against the data from hydraulic model experiments. The main results are summarized as follows: 1) Variation of the maximum velocity on slope tends to be decreased as the relative crest height become smaller. However, at the location in front of the cap-concrete, the maximum velocity is increased as the water level become larger. 2) The points occurred the maximum velocity are moved from the slope to the crest in front of the cap-concrete as the water level increase. 3) The maximum velocity is increased as the surf similarity parameter is larger. The dimensionless maximum velocity was below 0.5 on slope, and the maximum velocity was occurred at the crest in front of the cap-concrete. These results emphasize that the location in front of cap-concrete of the rubble mound structures is the weakest part on their stability by the water level change.