Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Generation Mechanism and Numerical Simulation of Rip Current at Haeundae Beach

해운대 해수욕장의 이안류 발생기구 및 수치모의

  • Kim, In-Chul (Division of Architecture & Civil Engineering, Dongseo University) ;
  • Lee, Joo-Yong (Department of Civil and Environmental Engineering, Sungkyunkwan University) ;
  • Lee, Jung-Lyul (Department of Civil and Environmental Engineering, Sungkyunkwan University)
  • 김인철 (동서대학교 건축토목공학부) ;
  • 이주용 (성균관대학교 건설환경시스템공학과) ;
  • 이정렬 (성균관대학교 사회환경시스템공학부)
  • Received : 2011.01.03
  • Accepted : 2011.01.10
  • Published : 2011.02.28
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Abstract

At Haeundae Beach in Busan, people were swept away by the fast-moving rip current and rescued, on August 13th and 15th, 2009 & July 29th and 30th, 2010. In predicting the wave-induced current and consequent tube movement for public safety, the coastal flows and waves are calculated at each time step and grid point by means of systematic interfacing of hydrodynamic and wave models (Lee, 2001). To provide a user-friendly simulation tool for end-users, the forecasting system has been built in a software package called HAECUM. Outputs from the system are viewed as graphs of tube positions with combined current vectors for easy decision of emergency management officials. The tube-wave interaction is taken into account and the traces of swim tube are simulated by using a Lagrangian random walk (Chorin, 1978; Lee, 1994). In this study, we use the Lee's approach (Lee, 1993) in estimating the surface onshore currents due to wave breaking.

2009년 8월 13일과 15일, 부산 해운대 해수욕장 앞 해상에서 이안류가 발생하였다. 또한, 올 여름인 2010년 7월 29일과 30일에도 이안류가 발생하여 피서객 들이 조난된 사고가 발생하였다. 해수욕객들은 전원 구조되어 인명 피해는 발생하지 않았지만 최근 이안류 발생이 너무 잦아져 이에 대한 원인파악과 대책마련이 시급한 실정이다. 본 논문에서는 파랑모형과 조류가 결합된 해빈류 모형을 기본으로 튜브거동까지 재현되는 사용자 편의를 위하여 GUI로 개발된 HAECUM 모형(HAEundae CUrrent Model)을 이용, 해운대 해수욕장의 이안류 발생 수치모의를 실시하였다.

Keywords

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