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Empirical Formula for Wave Runup of Rubble-Mound Structure Covered by Tetrapods: Effects of Front Slope and Armour Layer Thickness

TTP로 피복된 경사식구조물의 처오름높이 산정식: 사면경사 및 피복층 두께 효과

  • 이종인 (전남대학교 공학대학 해양토목공학과) ;
  • 배일로 (전남대학교 대학원 건설환경공학과)
  • Received : 2015.06.11
  • Accepted : 2015.07.06
  • Published : 2015.10.01

Abstract

Wave runup is one of the most important factors affecting the design of coastal structure exposed to wave attack. In this study, two dimensional laboratory tests were conducted under the different random wave conditions and structure configurations to develop a formula to predict runup heights. Rubble-mound structure consisted of tetrapod armour blocks with 1:1.5 and 1:2 slopes. The relative water depths (the ratio of the significant wave height to water depth at the toe) ranged from 0.14 to 0.56. The formula proposed here is applicable to surf similarity parameter ranging from 2 to 6. Runup heights on 1:2 slope were higher than those on 1:1.5 slope. Runup heights were reduced by 5% when the armour layer thickness increased two times.

파랑의 처오름높이는 항만 및 호안구조물 설계의 주요한 설계요소이다. 본 연구에서는 2차원 수리모형실험을 수행하고, 불규칙파 조건에서의 파랑의 처오름높이 산정식을 제안하였다. 실험에 적용된 경사식구조물 모형은 사면경사가 1:2이고, TTP로 피복되어 있다. 그리고 상대파고 (toe 위치에서의 유의파고와 수심의 비)은 0.14~0.56 범위에서 수행되었고, 제안된 처오름높이 산정식은 쇄파 유사성 매개변수가 2~6인 적용 범위를 갖는다. 실험결과에 따르면 사면경사 1:2의 처오름높이가 1:1.5인 경우보다 높게 나타났으며, 전체 실험조건에서 피복층의 두께가 약 2배될 때 처오름높이는 평균 5% 감소하였다.

Keywords

References

  1. Lee, J. I. and Bae, I. R. (2015). "Empirical formula for wave runup of rubble-mound structure covered by tetrapods: 1:1.5 Slope Condition." Journal of the Korean Society of Civil Engineers, Vol. 35, No. 4 (in Press).
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