Experiments for Wave Velocity Distribution in front of Composite Structure by Incident Wave Angles

Lee, Jong-In, Moon, Gang Il, Lim, Ho Seok

doi:10.12652/Ksce.2019.39.6.0759

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2019 Vol.39, Issue 6 Preview Page Next Page

Coastal and Harbour Engineering

Experiments for Wave Velocity Distribution in front of Composite Structure by Incident Wave Angles 입사각에 따른 혼성식구조물 전면의 유속분포 실험

December 2019. pp. 759-769

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Abstract

국내에서는 혼성식구조물의 근고부 안정성 확보를 위해 대부분 확장 Tanimoto 식이 이용되고 있다. 확장 Tanimoto 식의 경우에 파랑이 구조물에 직각으로 입사하는 경우보다 경사지게 입사하는 경우에 보다 큰 중량이 산정된다. 본 연구에서는 규칙파 및 불규칙파가 혼성식구조물에 직각 및 경사 입사하는 조건에 대해 수리모형실험으로 수평유속을 계측하여 확장 Tanimoto 식의 적용성을 검토하였다. 파랑이 구조물에 직각으로 입사하는 경우에 최대 수평유속은 파랑의 주기에 관계없이 근고부의 경사면에서 계측되었다. 경사입사파의 경우에는 연파발생조건에서 최대 수평유속이 크게 계측되었다. 실험결과는 Takahashi 등의 연구와 잘 일치하는 것으로 나타났다.

키워드

혼성식구조물

규칙파

불규칙파

수리모형실험

최대 수평유속

The extended Tanimoto formula has been widely used to estimate the stability for the toe protection of the composite structure. However, the extended Tanimoto formula usually over-estimates armor weight when the incident waves approach the structure obliquely because the formula incident originally considered the normally incident wave cases. In this study, three-dimensional hydraulic model experiments were conducted to investigate the horizontal wave velocity under monochromatic and random wave conditions to investigate the prediction capability of the extended Tanimoto formula under the different incident wave angle conditions. The maximum horizontal wave velocity was measured near the toe for the normally incident wave condition. In the case of obliquely incident waves, the maximum horizontal wave velocity was measured under the stem wave generation condition. The results of the experiments showed a good agreement with the results by Takahashi et al.

Keywords

Composite structure

Monochromatic wave

Random wave

Hydraulic model experiment

Maximum horizontal wave velocity

References

Madrigal, B. G. and Valdés, J. M. (1995). "Study of rubble mound foundation stability." Proc. of the Final Workshop, MAST II, MCS-Project.

Ministry of Oceans and Fisheries (2017). Design standard for harbor and fishery port (in Korean).

Takahashi, S., Kimura, K. and Tanimoto, K. (1990). Stability of amour units of composite breakwater mound against oblique waves, Report of the Port and Harbour Research Institute, in Japanese.

Tanimoto, K., Yahyu, T., Muranaga, T., Shibata, K. and Goda, Y. (1982). Stability of amor units of foundation mounds of composite breakwaters determined by irregular wave tests, Report of the Port and Harbour Research Institute, in Japanese.

U.S. Army Corps of Engineers (2008). Coastal engineering manual, Washington, D.C, USA.

Information

Publisher :Korean Society of Civil Engineers
Publisher(Ko) :대한토목학회
Journal Title :JOURNAL OF THE KOREAN SOCIETY OF CIVIL ENGINEERS
Journal Title(Ko) :대한토목학회 논문집
Volume : 39
No :6
Pages :759-769
Received Date :2019. 10. 04
Revised Date :2019. 11. 05
Accepted Date : 2019. 11. 07
DOI :https://doi.org/10.12652/Ksce.2019.39.6.0759

JOURNAL OF THE KOREAN SOCIETY OF CIVIL ENGINEERS ISSN:1015-6348(Print) 2287-934X(Online) 대한토목학회 논문집

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