KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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Influence of Wave Chamber Slab on Wave Pressure on First and Second Wall of Perforated Caisson Breakwater

유수실 상부 덮개가 유공 케이슨 방파제의 전면벽 및 후면벽 파압에 미치는 영향

  • Received : 2013.06.11
  • Accepted : 2013.09.17
  • Published : 2013.11.30
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Abstract

In this study, the effect of wave chamber slab on wave pressure along the first and second wall of the perforated caisson breakwater was investigated by performing physical experiment. The experiment was performed without and with the wave chamber slab of the perforated caisson by varying the front wall porosity. The discrepancy in magnitudes of the measured wave pressure along the both walls of the perforated caisson was apparent according to the existence of the wave chamber slab as significantly greater pressures were acquired for all the test cases when the wave chamber was closed upward by the slab. As a result, the magnitudes of the total wave force calculated by integration of the measured wave pressure also were much larger for the caisson breakwater having the wave chamber slab, exceeding the value based on the well known Takahashi's formula (Takahashi and Shimosako, 1994). With respect to the porosity of the front wall, meanwhile, higher pressures were obtained with a larger porosity, at both the first and second wall of the breakwater.

이 연구에서는 수리모형실험을 통해 유수실 상부 덮개가 유공 케이슨 방파제 전면벽 및 후면벽에서의 파압에 미치는 영향을 고찰하였다. 수리모형실험은 유공 케이슨의 유수실 상부 덮개가 있는 경우 및 없는 경우에 대해서 전면벽 유공률을 변화시키면서 이루어졌다. 유수실 상부가 덮개로 막혀 있을 때에는 모든 실험 조건에서 유의미하게 더 큰 파압이 취득되었으며 따라서 유수실 상부 덮개 존재에 따른 두 벽에서의 계측 파압 차이는 매우 뚜렷하게 나타났다. 그 결과 계측 파압을 적분하여 계산된 전파력의 크기 역시 상부 덮개가 있는 케이슨 방파제의 경우가 더 컸으며, 이 경우 잘 알려진 Takahashi의 파압식에 근거한 파력값을 상회하였다. 한편, 전면벽 유공률에 따라서는 방파제 전면벽 및 후면벽에서 모두 유공률이 클수록 더 큰 파압이 계측되었다.

Keywords

References

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