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Hydrodynamic Characteristics of Tide-Adapting Low-Crested Structure

조위차 극복형 저마루 구조물의 수리특성

  • Hur, Dong-Soo (Department of Ocean Civil Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Jeong, Yeon-Myeong (Institute of Marine Industry, Gyeongsang National University) ;
  • Lee, Woo-Dong (Department of Ocean Civil Engineering, Institute of Marine Industry, Gyeongsang National University)
  • 허동수 (국립경상대학교 해양산업연구소 해양토목공학과) ;
  • 정연명 (국립경상대학교 해양산업연구소) ;
  • 이우동 (국립경상대학교 해양산업연구소 해양토목공학과)
  • Received : 2018.11.09
  • Accepted : 2019.02.22
  • Published : 2019.02.28

Abstract

A low-crested structure (LCS) is an excellent feature not only because it provides shore protection but also because it is fully submerged. However, in order to properly control waves, it is necessary to maintain a certain range of crest height and width in consideration of the wave dimensions at the installation area. According to previous studies, an LCS has some wave breaking effect when the crest width is more than a fourth of the incident wavelength and the crest depth is less than a third of the incident wave height. In other words, if the crest width of the LCS is small or the crest depth is large, it cannot control the wave. Therefore, when an LCS is installed in a large sea area with a great tidal range in consideration of the landscape, waves cannot be blocked at high tide. In this study, the hydraulic performances of a typical trapezoidal LCS with a constant crest height and a low-crested structure with an adjustable crest height, which was called a tide-adapting low-crested structure (TA-LCS) in this study, were compared and evaluated under various wave conditions through hydraulic experiments. It was found that the wave transmission coefficients of the TA-LCS at high tide were lower than the values for the typical LCS based on empirical formulas. In addition, the hydraulic performances of the TA-LCS for wave reflection control were 12.9?30.4% lower than that of the typical LCS. Therefore, the TA-LCS is expected to be highly effective in controlling the energy of incoming waves during high tide even in a macro-tidal area.

Keywords

Low-crested structure(LCS);Tide-adapting low-crested structure(TA-LCS);Wave control;Breakwater development;Hydraulic experiment

Acknowledgement

Grant : 연안침식 관리 및 대응기술 실용화

Supported by : 해양수산과학기술진흥원

References

  1. Bleck, M., Oumeraci, H., 2001. Wave Damping and Spectral Evolution at Artificial Reefs. Proceedings of 4th International Symposium on Ocean Wave Measurement and Analysis, San Francisco USA.
  2. Calabrese, M., Vicinanza, V., Buccino, M., 2002. Large Scale Experiments on the Behaviour of Low Crested and Submerged Breakwaters in Presence of Broken Waves. Proceedings of the 28th International Conference on Coastal Engineering, ASCE, 1900-1912.
  3. CDIT(Coastal Development Institute of Technology), 2001. CADMAS-SURF, Development for the Numerical Simulation of Waves. CDIT Library, Japan.
  4. Goda, Y., Ahrens, J.P., 2008. New Formulation of Wave Transmission over and through Low-Crested Structures. Proceedings of the 31st International Conference on Coastal Engineering, ASCE, 3530-3541. https://doi.org/10.1142/9789814277426_0293
  5. Goda, Y., Suzuki, Y., 1976. Estimation of Incident and Reflected Waves in Random Wave Experiments. Proceedings of 15th International Conference Coastal Engineering, ASCE, 828-845. https://doi.org/10.1061/9780872620834.048
  6. Cox, R.J., Tajziehchi, M., 2005. 2D Experimental Modeling of Hydrodynamic Effects of Submerged Breakwaters. Proceedings of 5th International Conference on Coastal Dynamics, Barcelona Spain. https://doi.org/10.1061/40855(214)51
  7. d'Angremond, K., van der Meer, J.W., de Jong, R.J., 1996. Wave Transmission at Low-Crested Structures. Proceedings of the 25th International Conference on Coastal Engineering, ASCE, 2418-2427. https://doi.org/10.1061/9780784402429.187
  8. Hur, D.S., Cho, W.C., Yoon, J.S., Kim, I.H., Lee, W.D., 2014. Control Technologies in Reduction Rip Currents around the Open Inlet between Two Submerged Breakwaters. Journal of Coastal Research, Special Issue, 72, 75-80. https://doi.org/10.2112/SI72-014.1 https://doi.org/10.2112/SI72-014.1
  9. Hur, D.S., Cho, W.C., Yoon, J.S., Kang, C., Lee, W.D., 2017b. Applicability of Multiple Submerged Narrow-Crested Breakwaters for Reduction of Mean Water Level in Rear Side and Flow Control. Journal of Coastal Research, Special Issue, 79, 179-183. https://doi.org/10.2112/SI79-037.1 https://doi.org/10.2112/SI79-037.1
  10. Hur, D.S., Lee, W.D., An, S.W., Park, J.B., 2010. A Numerical Study on Flow Control Structure of a New-Type Submerged Breakwater. Journal of Korean Society of Coastal and Ocean Engineers, 22(3), 181-190.
  11. Hur, D.S., Lee, W.D., Cho, W.C., 2012a. Three-Dimensional Flow Characteristics around Permeable Submerged Breakwaters with Open Inlet. Ocean Engineering, 44, 100-116. https://doi.org/10.1016/j.oceaneng.2012.01.029 https://doi.org/10.1016/j.oceaneng.2012.01.029
  12. Hur, D.S., Lee, W.D., Cho, W.C., 2012b. Characteristics of Wave Run-up Height on a Sandy Beach behind Dual-Submerged Breakwaters. Ocean Engineering, 45, 38-55. https://doi.org/10.1016/j.oceaneng.2012.01.030 https://doi.org/10.1016/j.oceaneng.2012.01.030
  13. Hur, D.S., Lee, W.D., Goo, N.H., Jeon, H.S., Jeong, Y.M., 2017a. Development of New Type of Submerged Breakwater for Reducing Mean Water Level behind Structure. Journal of Ocean Engineering and Technology, 31(2), 130-140. https://doi.org/10.5574/KSOE.2017.31.2.130 https://doi.org/10.5574/KSOE.2017.31.2.130
  14. Hur, D.S., Jung, K.H., Park, J.R., Lee, W.D., 2019. Wave Control Performance of Tide-Adapting Low-Crested Structure Overcoming Tidal Range. Journal of Coastal Research, Special Issue 91(Under review).
  15. Le, Q., Yang, Y., Yin, Z., Zhang, F., 2016. Numerical Analysis of a New Kind of Submerged Breakwater with an Air Chamber. Proceedings of the 26th International Ocean and Polar Engineering Conference, International Society of Offshore and Polar Engineers, Rhodes Greece.
  16. Seabrook, S.R., Hall, K.R., 1998. Wave Transmission at Submerged Rubble Mound Breakwaters. Proceedings of the 26th International Conference on Coastal Engineering, ASCE, 2000-2013. https://doi.org/10.1061/9780784404119.150
  17. Uemura, T., 2013. A Numerical Simulation of the Shape of Submerged Breakwater to Minimize Mean Water Level Rise and Wave Transmission. Master's Thesis, Lund University, Sweden.
  18. van der Meer, J.W., Briganti, R., Zanuttigh, B., Wang, B., 2005. Wave Transmission and Reflection at Low-Crested Structures: Design Formulae, Oblique Wave Attack and Spectral Change. Coastal Engineering, 52(10-11), 915-929. https://doi.org/10.1016/j.coastaleng.2005.09.005 https://doi.org/10.1016/j.coastaleng.2005.09.005