• Journal of Korean Society of Coastal and Ocean Engineers
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• v.23 no.1
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• pp.70-78
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• 2011

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.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.4
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• pp.1191-1201
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• 2014

The rip current warning index function, which estimates the likelihood of dangerous rip current in the real-time rip current warning system operating to help mitigate against rip current accidents at Haeundae beach, was studied. The rip current warning index evaluated as a function of various real-time observations was developed based on Choi et al. (2013b). This study shows a version of rip current warning index improved by including the effect of wave direction and spreadings of frequency-directional spectrum on rip current likelihood. The wave and tidal observations in 2012 at Haeundae coast were applied to the rip current index function, and its performances at several real events found based on CCTV images were presented and analyzed.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.23 no.4
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• pp.276-284
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• 2011

The rip current occurred at Haeundae beach was numerically investigated under directional random wave environment. The numerical simulation was performed using a fully nonlinear Boussinesq equation model, FUNWAVE which is capable of simulating nearshore circulation since it includes the effect of wave-induced momentum flux and horizontal turbulent mixing. The results of numerical simulation show the time-dependent evolution of the wave-induced nearshore circulation system (including rip current) that are caused by nonlinear transformation of directional irregular waves due to unique topography of Haeundae. From the results, it was found that rip current is well generated and developed where relatively lower wave height and relatively deeper water depth along the longshore direction, and sudden and strong events of rip current were observed.

• Korean Journal of Environmental Biology
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• v.29 no.3
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• pp.202-207
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• 2011

Bacterial contamination of beach sand was examined in April, June, July, and August. Twenty four topsoil and subsoil samples were taken from the 1m and 5m points from the coastline in three Busan beaches (Haeundae, Gwanganli, and Songjeong). The 5m points from the coastline showed higher coliform contamination than 1 m points. July showed the highest bacterial contamination on beaches among surveyed months. Coliform contamination in the subsoil was higher than that of the topsoil. The bacterial contamination of 5m points of topsoil and subsoil in June except the Songjeong Beach was higher than those of July and August. We investigated Staphylococcus aureus, Vibrio parahaemolyticus, Vibrio vulnificus, Vibrio cholerae, and Bacillus cereus. Only B. cereus was detected at the beach in August. Although microbiological pollution of the Gwanganli Beach was the highest among three Busan beaches, the degree of contamination was not high compared to those of other countries. However, sandy soil management in public beach for pathogenic microorganisms is needed.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.1 no.1
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• pp.50-62
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• 1989

Shoreline change of Haeundae beach was predicted by one-line model considering interaction of seawalls and longshore variation of wave height . Wave deformation was calculated by combined wave refraction-diffraction model . In this shoreline change model, empirical constants and offshore sediment transport rate are treated as calibration parameters, and the calculated results are in good agreement with the observed data.

• Journal of Ocean Engineering and Technology
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• v.30 no.4
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• pp.320-326
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• 2016

Rip current forecasts, based on intensity, are marked in four levels—notice, watch, warning, and danger. However, numerical results are represented by current vectors, whose magnitudes are then converted into predictive levels. In the present study, the rose diagram is adapted as a determinative forecasting index and examined for the case of an ideal rip channel consisting of surface, bottom, and averaged currents. Further, it is employed in the sensitivity analysis of wave-induced currents generated by wave conditions at the Haeundae Beach. The simulation of surface onshore and bottom undertow currents is accomplished by including a mass flux term in the wave-averaged continuity equation.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2009.10a
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• pp.29-32
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• 2009

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.51 no.1
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• pp.128-135
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• 2015

The worldwide abundance of various jellyfish appears to have increased in coastal ecosystems in recent years. The enormous jellyfish blooms cause a variety of problems for the local ecology, fisheries, and aquatic-sports in coastal locations. In this study, jellyfish sting protection net was installed to ensure the safety and reduction of the inflow into the Haeundae beach. In order to confirm the stability of the protection net, the tension for protection net was measured from variation of current speed. The periods for maximum tension were observed correspond to the periods of maximum current speed. The maximum tension for protection net was measured up to 4,100 kg. From field evaluations, the jellyfish sting protection net has demonstrated to stability from the current and tide in the Haeundae beach.

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.88-88
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• 2017

• Proceedings of the Korean Society of Disaster Information Conference
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• 2015.11a
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• pp.246-249
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• 2015

본 연구에서는 해운대 해수욕장 연안정비사업 전후의 지형변화에 따른 이안류 발생 변화에 대해 분석하였다. 본 연구에서는 Matlab GUI (Graphical User Interface)로 개발한 HAECUM (HAE(海) Current Model)을 통하여 해운대 해수욕장의 해빈류를 모의 하였다. 분석에 사용된 데이터는 이상적인 경우와 실제 이안류가 발생한 상황에 대해 각각 적용하였으며, 상호비교의 효율성을 위하여 해빈류 장미도를 통해 비교 분석 하였다. 본 연구를 통해 해운대 해수욕장의 연안정비사업에 따른 해빈류 및 이안류에 대한 상관성 도출하였다.