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Applicability of Investigation Modified Design Wave Model Considering Diffraction and Water Depth Effects

회절 및 수심효과를 개선한 만내설계파 모델의 적용성 검토

  • 김규한 (관동대학교 토목공학과) ;
  • 한하나 ((주)대영엔지니어링 항만부)
  • Received : 2012.12.03
  • Accepted : 2013.11.28
  • Published : 2013.12.31

Abstract

The purpose of this study is to review and overcome the limits of the existing design wave model applied to such waters as those located inside bays or near islands where the impact of wind influenced waves are more dominant, due to the nature of topographic isolation, than the influence of direct waves coming from the open sea. Although the existing model for an inside bay design wave is excellent for considering wind factors and very adaptable to topographically complicated areas compared to other models, it is difficult to show the wave diffractions and reflections caused by large scale structures or topographic features in the region. The study examined the various methods capable of taking into account wave diffraction, the angle of wave reflection, and changes in water depth. As a result of applying the modified design wave model to the target situation (inside bay or near island areas), it was found that the reliability of the design wave height around marine structures was improved, compared to the existing models. Therefore, it is fair to predict that the new model could provide more accurate design waves in the design of marine structures.

본 연구에서는 만 또는 도서지역과 같이 지형적으로 차폐되어 외해로부터 직접적인 파랑전파가 어렵고 바람에 의해 발달된 파랑의 영향이 클 것으로 판단되는 지역에 사용되는 기존 만내설계파 모델의 문제점을 분석하고 개선방안을 검토하였다. 기존 만내설계파 모델은 바람을 고려할 수 있고 타 모델에 비해 복잡한 지형에도 비교적 간편하게 사용할 수 있는 장점을 지니는 반면 인근 대형 구조물 또는 지형에 의한 파랑의 회절 및 반사 등의 고려가 곤란하다. 기존모델의 단점을 극복하기 위해 회절 및 반사각, 수심변화 등의 고려가 가능한 개량된 만내설계파 모델을 현지에 적용하고 기존 모델과 비교 검토한 결과 구조물 주변에서 설계파고의 값에 신뢰성이 향상되는 것을 확인하였다. 따라서 개선된 만내설계파 모델은 차폐되어 있는 해역에서 항만 구조물 설계 시 기존의 방법에 비해 보다 고정도의 설계파를 산정하는 방법으로서 이용될 수 있을 것으로 판단된다.

Keywords

References

  1. Booij, N., Holthuijsen, L.H. and Ris, R.C. (1996), The "SWAN" wave model for shallow water, Proc. 25th Int. Conf Coastal Eng., 668-676
  2. Booji, N., Holthuijsen, L.H., Doorn, N. and Kieftenburg, A.T.M.M.(1997), Diffraction in a spectral wave model, Proc, 3rd Int. Symp. On Wave '97, ASCE, 243-255
  3. Booij, N., Ris, R.C. and Holthuijsen, L. (1999) A third generation wave model for coastal regions. Part I. Model description and valdation. J. Geophys. Res., 104, C4, 7649-7666. https://doi.org/10.1029/98JC02622
  4. Han, H.N. (2007) Applicability Study of Wind Wave Model include the Effects of Diffraction and Reflection, 2007 KSCE Conference, 4577-4580
  5. Holthuijsen, L.H., Herman, A. and Booij, N. (2003) Phase-decoupled refraction-diffraction for spectral wave models. Coastal Engineering, 49, 291-305. https://doi.org/10.1016/S0378-3839(03)00065-6
  6. JSCE (1994), coastal waves
  7. Karlsson, T. (1969) Refraction of continuous ocean wave spectra, Proc. ASCE, Vol.95, No.WW4, 471-4
  8. Kim, T.H. (2005) Distribution of Wind Waves in the Gyeonggi Bay Derived from Numerical Wave Model, Asia-Pacific Journal of Atmospheric Sciences, 41, 5, 697-706
  9. Mase, H., Takayama, T., Kunitomi, S., and Mishima, T. (1999) Multidirectional spectral wave transformation model including diffraction effect, Journal of Hydraulic, Coastal and Environmental Engineering, JSCE, Vol. 628, No. II-48, 177-187.
  10. Oki, K., and Mase, H. (2008) Development of Multidirectional Random Wave Transformation Model in Wave-Current Coexisting Field, JSCE, Vol. 35, 1-5
  11. Rivero, F.J., Arcilla, A.S. and Carci, E. (1997) An analysis of diffraction in spectral wave model, Proc. 3rd Int. Symp. On Wave '97, ASCE, 431-445
  12. Shin, B.S. (2005) Numerical calculation method of the design wave with considering wind effect in a closed coastal area, 2005 KSCE Conference, 784-7
  13. Toshihiko, N., Chiaki, G., and Koji K. (1990) Wave hindcast model using the hybrid-parameter method(1st report)-Application to the Tokyo Bay-, Report of the Port and Harbour Research Institute, Volume 29, No. 4, 85-118
  14. Tomotsuka, T., (1990) Present status of the calculation method of the deformation of an ocean wave and its estimated accuracy. Report of the Port and Harbour Research Institute, 195-235
  15. Wilson, B.W. (1965) Numerical prediction of ocean waves in the North Atlantic for December, 1959, Deut, Hydro, Zeit., Jahrg., 18, Ht. 3, 114-130 https://doi.org/10.1007/BF02333333
  16. W.M.O. (1998) Guide to wave analysis and forecasting (second edition), WMO-No.7
  17. Yoshimi, G., and Yasumasa, S. (1975) Computation of refraction and diffraction of sea waves with Mittsuyasu's directional spectrum, technical note of the port and harbour research institute ministry of transport, japan No.230, 45