Numerical study for classifying generation types of rip currents at the beaches of the East Sea coast

Junwoo Choi

doi:10.3741/JKWRA.2022.55.9.645

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2022 Vol.55, Issue 9 Next Page

Research Article

Numerical study for classifying generation types of rip currents at the beaches of the East Sea coast 수치모의를 통한 동해안 해수욕장의 이안류 발생 형태 분류 연구

30 September 2022. pp. 645-655

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Abstract

Recently rip currents are frequently observed in the summer at the beaches located along the East Sea coast. To understand the generation types of rip currents occurred at the Ease Sea beaches, numerical simulations of rip currents over the topographies of the Sokcho, Naksan, Gyeongpo, Mangsang beaches were performed by using a Boussinesq-type wave and current model, FUNWAVE. The offshore and nearshore topographically-controlled rip currents and the transient rip currents were well reproduced due to the alongshore non-uniformities involving the phase interaction effects. This study looked over the generation types of rip currents to occur at the beaches with complicated field bathymetries.

Keywords

Rip current

the Ease Sea coast

Sokcho

Naksan

Gyeongpo

Mangsang

Numerical simulation

FUNWAVE

최근 동해안 해수욕장에서도 여름철 해수욕 기간에 이안류가 자주 관찰되고 있다. 우리나라 동해안에 위치한 해수욕장들에서 발생하는 이안류의 원인 특성을 수치모의 결과를 이용하여 검토하였다. 속초, 낙산, 경포대, 망상 해수욕장 앞바다의 수심자료를 이용하여 Boussinesq 방정식을 지배방정식으로 하는 FUNWAVE 모형으로 수치모의를 수행하였다. 각 해수욕장 앞바다 지형, 샌드바 형성 및 입사파 특성 등의 영향으로 변형되는 위상의 상호작용을 포함한 파의 횡방향 비균등성에 의해 발생하는 이안류가 잘 재현되었다. 그 결과를 기반으로 각 해수욕장에서 발생 가능한 이안류의 종류를 기술하였다.

키워드

이안류

동해안 해수욕장

속초

낙산

경포

망상

수치모의

FUNWAVE

References

Bowen, A.J., and Inman, D.L. (1971). "Edge waves and crescentic bars." Journal of Geophysical Research, Vol. 76, No. 36, pp. 8662-8671. 10.1029/JC076i036p08662

Castelle, B., Scott, T., Brander, R.W., and McCarroll, R.J. (2016). "Rip current types, circulation and hazard." Earth-Science Reviews, Vol. 163, pp. 1-21. 10.1016/j.earscirev.2016.09.008

Chen, Q., Dalrymple, R.A., Kirby, J.T., Kennedy, A.B., and Haller, M. (1999). "Boussinesq modelling of a rip current system." Journal of Geophysical Research, Vol. 104, pp. 20617-20637. 10.1029/1999JC900154

Chen, Q., Kirby, J.T., Dalrymple, R.A., Kennedy, A.B., and Chawla, A. (2000). "Boussinesq modeling of wave transformation, breaking and runup II: Two horizontal dimensions." Journal of Waterway, Port, Coastal and Ocean Engineering, Vol. 126, No. 1, pp. 48-56. 10.1061/(ASCE)0733-950X(2000)126:1(48)

Chen, Q., Kirby, J.T., Dalrymple, R.A., Shi, F., and Thornton, E.B. (2003). "Boussinesq modeling of longshore current." Journal of Geophysical Research, Vol. 108, No. C11, pp. 26-1-26-18. 10.1029/2002JC001308

Choi, J. (2015). "Numerical simulations of rip currents under phase-resolved directional random wave conditions." Journal of Korean Society of Coastal and Ocean Engineers, Vol. 27, No. 4, pp. 238-245 (in Korean). 10.9765/KSCOE.2015.27.4.238

Choi, J., and Roh, M. (2021). "A laboratory experiment of rip currents between the ends of breaking wave crests." Coastal Engineering, Vol. 164, 103812. 10.1016/j.coastaleng.2020.103812

Choi, J., Kirby, J.T., and Yoon, S.B. (2015). "Boussinesq modeling of longshore currents in the SandyDuck experiment under directional random wave conditions." Coastal Engineering, Vol. 101, pp. 17-34. 10.1016/j.coastaleng.2015.04.005

Choi, J., Park, W.K., Bae, J.S., and Yoon, S.B. (2012). "Numerical study on a dominant mechanism of rip current at Haeundae beach: Honeycomb pattern of waves." Journal of the Korean Society of Civil Engineers, Vol. 32, No. 5B, pp. 321-320 (in Korean). 10.12652/Ksce.2012.32.5B.321

Choi, J., Shin, C.H., and Yoon, S.B. (2013). "Numerical study on sea state parameters affecting rip current at Haeundae beach: Wave period, height, direction and tidal elevation." Journal of Korea Water Resources Association, Vol. 46, No. 2, pp. 205-218 (in Korean). 10.3741/JKWRA.2013.46.2.205

Clark, D.B., Elgar, S., and Raubenheimer, B. (2012). "Vorticity generation by short-crested wave breaking." Geophysical Research Letters, Vol. 39, No. 24, L24604. doi: 10.1029/2012GL054034 10.1029/2012GL054034

Dalrymple, R.A. (1975). "A mechanism for rip current generation on an open coast." Journal of Geophysical Research, Vol. 80, pp. 3485-3487. 10.1029/JC080i024p03485

Dalrymple, R.A. (1978). "Rip currents and their causes." 16th International Conference of Coastal Engineering, Hamburg, Germany, pp. 1414-1427. 10.9753/icce.v16.83

Dalrymple, R.A., MacMahan, J.H., Reniers, A.J.H.M., and Nelko, V. (2011). "Rip currents." Annual Review of Fluid Mechanics, Vol. 43, pp. 551-581. 10.1146/annurev-fluid-122109-160733

Feddersen, F. (2014). "The generation of surfzone eddies in a strong alongshore current." Journal of Physical Oceanography, Vol. 44, pp. 600-617. 10.1175/JPO-D-13-051.1

Johnson, D., and Pattiaratchi, C. (2006). "Boussinesq modelling of transient rip currents." Coastal Engineering, Vol. 53, pp. 419-439. 10.1016/j.coastaleng.2005.11.005

Kennedy, A.B., Chen, Q., Kirby, J.T., and Dalrymple, R.A. (2000). "Boussinesq modeling of wave transformation, breaking, and runup. I: 1D." Journal of Waterway, Port, Coastal and Ocean Engineering, Vol. 126, pp. 39-47. 10.1061/(ASCE)0733-950X(2000)126:1(39)

Korea Hydrographic and Oceanographic Agency (KHOA) (2021). Report for operation of rip current warning system in 2021.

Mitsuyasu, H., Tasai, F., Suhara, T., Mizuno, S., Ohkusu, M., Honda, T., and Rikiishi, K. (1975). "Observations of the directional spectrum of ocean waves using a cloverleaf buoy." Journal of Physical Oceanography, Vol. 5, pp. 750-760. 10.1175/1520-0485(1975)005<0750:OOTDSO>2.0.CO;2

Peregrine, D.H. (1998). "Surf zone currents." Theoretical and Computational Fluid Dynamics, Vol. 10, pp. 295-309. 10.1007/s001620050065

Peregrine, D.H. (1999). "Large-scale vorticity generation by breakers in shallow and deep water." European Journal of Mechanics. B. Vol. 18, pp. 403-408. 10.1016/S0997-7546(99)80037-5

Shin, C.H., Noh, H.K., Yoon, S.B., and Choi, J. (2014). "Understanding of rip current generation mechanism at Haeundae Beach of Korea: Honeycomb waves." Journal of Coastal Research, Vol. 72, No. sp1, pp. 11-15. 10.2112/SI72-003.1

Tang, E.C.-S., and Dalrymple, R.A. (1989). Nearshore circulation: Rip currents and wave groups. Advances in Coastal and Ocean Engineering. Plenum Press, New York, U.S., pp. 205-230. 10.1007/978-1-4899-2531-2_222631118

Wei, G., Kirby, J.T., Grilli, S.T., and Subramanya, R. (1995). "A fully nonlinear Boussinesq model for surface waves: Part 1: Highly nonlinear unsteady waves." Journal of Fluid Mechanics, Vol. 294, pp. 71-92. 10.1017/S0022112095002813

Yoon, S.B., Kwon, S.J., Bae, J.S., and Choi, J. (2012). "Investigation of characteristics of rip current at Haeundae Beach based on observation analysis and numerical experiments." Journal of the Korean Society of Civil Engineers, Vol. 23, No. 4B, pp. 243-251 (in Korean). 10.12652/Ksce.2012.32.4B.243

Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 55
No :9
Pages :645-655
Received Date : 2022-07-06
Revised Date : 2022-08-09
Accepted Date : 2022-08-09
DOI :https://doi.org/10.3741/JKWRA.2022.55.9.645

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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